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Hitoshi Tanaka

Section

Institute for Excellence in Higher Education

Job title

President-Appointed Extraordinary Professor

Degree

工学博士（東北大学）

researchmap

https://researchmap.jp/tanaka_1956

J-GLOBAL ID

200901062002013715

Research History 11

2022/06 - Present

Alpha Hydraulic Engineering Consultants Co., Ltd.　Technical Advisor
2022/04 - Present

Tohoku University　professor emeritus
2022/04 - Present

Institute of Liberal Arts and Sciences, Tohoku University　President-appointed Extraordinary Professor
2019/09 - Present

Distinguished Professor, Thuyloi University, Vietnam.
1996/04 - 2022/03

Professor, Graduate School of Engineering, Tohoku University
1996/07 - 1996/09

Visiting Researcher, Institute of Hydrodynamics and Hydraulic Engineering (ISVA), Technical University of Denmark
1990/07 - 1996/02

Associate Professor, Faculty of Engineering, Tohoku University
1991/08 - 1993/09

Associate Professor, Asian Institute of Technology
1988/04 - 1990/06

Lecturer, Faculty of Engineering, Tohoku University
1984/04 - 1988/03

Assistant Professor, Faculty of Engineering, Utsunomiya University
1996/03 -

Professor, Faculty of Engineering, Tohoku University

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Education 2

Tohoku University　Graduate School, Division of Engineering　Department of Civil Engineering

- 1984/03
Tohoku University　Faculty of Engineering　Department of Civil Engineering

- 1979/03

Professional Memberships 6

The Visualization Society of Japan
Tohoku Society for Engineering Education
Japan Society for Engineering Educaion
Japan Society for Natural Disaster and Science
International Association for Hydro-Environment Engineering and Research (IAHR)
Japan Society of Civil Engineers

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Research Interests 3

Coastal Engineering
Hydraulic Engineering
Environmental Hydraulics

Research Areas 1

Social infrastructure (civil Engineering, architecture, disaster prevention) / Hydroengineering / Environmental Hydraulic Engineering

Awards 21

Fellow

2025/06　International Association for Hydro-Environment Engineering and Research (IAHR)　Fellow
Contribution Award, Japan River Association

2024/05　Japan River Association
International Lifetime Contribution Award, JSCE

2023/06　Japan Society of Civil Engineers
The Taisei Foundation Award, Gold Medal

2021/10　The Taisei Foundation　Proposal of a new friction law for tsunami numerical simulation
JSCE Best Paper Award

2021/06　Japan Society of Civil Engineers　Study on boundary layer development and bottom shear stress beneath a tsunami
JAMSTEC Nakanishi Award

2021/03　Japan Federation of Ocean Engineering Societies　Study on boundary layer development and bottom shear stress beneath a tsunami
Order of Merit of Ministry of Agriculture and Rural Development and Ministry of Education and Training

2019/11　Ministry of Agriculture and Rural Development and Ministry of Education and Training, Vietnam
Coastal Engineering Journal Award (Annual best paper award, 2019)

2019/11　Study on boundary layer development and bottom shear stress beneath a tsunami
River Foundation Award

2019/08　River Foundation　Mechanism of late recovery of estuarine morphology after the 2011 Tohoku Tsunami
Award in recognition of outstanding contribution to the agriculture and rural development in Vietnam

2019/01　Ministry of Agriculture and Rural Development, Vietnam　Award in recognition of outstanding contribution
Award in recognition of outstanding contribution to the preventional and mitigation of coastal erosion in Cua Dai Beach and Thu Bon River mouth, Quang Nam Province

2019/01　Province of Quang Nam, Vietnam.　Award in recognition of outstanding contribution
Distinguished IAHR-APD Membership Award in recognition of distinguished contribution to the scientific activities of the IAHR-Asian and Pacific Regional Division

2016/08　IAHR-Asian and Pacific Regional Division
Excellence in Research Award, the Foundation of River and Watershed Environmental Management, July 2015

2016/07　River Foundation　Modification of coastal sediment balance due to the 2011 Tohoku Tsunami
Excellence in Research Award, the Foundation of River and Watershed Environmental Management, July 2015

2015/07　River Foundation　Mechanism of late recovery of estuarine morphology after the 2011 Tohoku Tsunami
Educational Excellence, School of Eng., Tohoku University

2014/03　Tohoku University
Excellence in Research Award, the Foundation of River and Watershed Environmental Management

2013/11　River Foundation　Study on tsunami propagation into rivers
The Presidential Prize for Educational Excellence

2012/03　Tohoku University
The Best Paper Award, 12th APD-IAHR Congress

2000/11　APD-IAHR　‘History effect’ on turbulent transition in the bottom boundary layer under irregular waves
Visiting Research Fellow at Technical University of Denmark

1996/07　The Kajima Foundation　Recent researches in EU on turbulent boundary layer under waves and current
Young Researcher's Award, JSCE

1988/06　Japan Society of Civil Engineers　Friction law for wave-corrent combined motion
Young Researcher Award, Society for the Promotion of Construction Engineering, Japan

1985/06　Society for the Promotion of Construction Engineering, Japan　Sediment movement under waves and current

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Papers 893

Evaluating Water Level Variability Under Different Sluice Gate Operation Strategies: A Case Study of the Long Xuyen Quadrangle, Vietnam Peer-reviewed

Dinh Van Duy, Nguyen Thai An, Tran Van Ty, Lam Tan Phat, Ngo Thanh Toan, Huynh Vuong Thu Minh, Nigel K. Downes, Hitoshi Tanaka

Hydrology　12　(5)　102　2025/04/23

DOI： 10.3390/hydrology12050102 　
Interrelationship between Wall and Beach Erosion in Loc An, Vietnam: Remote Sensing and Numerical Modeling Approaches Peer-reviewed

Dinh Van Duy, Nguyen Quang Duc Anh, Nguyen Trung Viet, Hitoshi Tanaka

Water　16　(17)　2553-2553　2024/09/09
Publisher: MDPI AG
DOI： 10.3390/w16172553 　

eISSN： 2073-4441

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Beach erosion and coastal protection are complex and interconnected phenomena that have a substantial impact on coastal environments worldwide. Among the various coastal protection measures, seawalls have been widely implemented to mitigate erosion and protect coastal assets. However, the interrelationship between beach erosion and seawalls remains a critical topic for investigation to ensure effective and sustainable coastal management strategies. Seawalls impact the shoreline, particularly through the “end effect”, where the seawall functions similarly to a groin, causing erosion on the downdrift side relative to the direction of wave approach. This study provides a detailed analysis of the interplay between beach erosion and seawall structures in Loc An, Vietnam, employing both remote sensing and numerical approaches. Sentinel-2 images were employed together with an analytical solution to observe the shoreline change at the Loc An sand spit and to determine input values for the numerical model. Based on the shoreline dynamics, a numerical scheme was employed to study the shoreline evolution after the construction of a seawall. Our findings show that the shoreline evolution can be divided into three stages: (1) The first stage corresponds to the elongation of the sand spit without interference from coastal structures. (2) The second stage shows the effect of jetties on the shoreline, as signaled by the buildup of sand updrift of the jetties. (3) The third stage shows the effectiveness of the seawall, where the shoreline reaches its equilibrium condition. The study provides a quick and simple method for estimating shoreline diffusivity (ε) in situations where measured data is scarce.
Exploring Thermal Barrier and Sedimentation Simulation for Enhanced Performance in Grati Combined Cycle Power Plant Invited Peer-reviewed

Suntoyo, I Cahya, M R Islam, H Tanaka

IOP Conference Series: Earth and Environmental Science　1298　(1)　012036-012036　2024/02/01
Publisher: IOP Publishing
DOI： 10.1088/1755-1315/1298/1/012036 　

ISSN： 1755-1307

eISSN： 1755-1315

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Abstract PLTGU is a power generation facility that concurrently utilizes both steam and gas power plant technologies. It necessitates a cooling system to operate efficiently throughout its entire lifespan. If PLTGU Grati plans to increase its power capacity, there is a concern that the water discharged from the Water Outlet channel might not cool down sufficiently before re-entering the Water Intake channel. Additionally, sedimentation in the sea water uptake is causing siltation. Hence, this study focuses on the jetty extension project to address sedimentation and hot water spreading issues in PLTGU Grati. The numerical modeling analysis, conducted using the Delft3D software, indicates that in the case of power addition, Alternative Model 1 can reduce the highest temperature compared to the existing condition by 0.655°C. Similarly, Alternative Model 2 reduces the highest temperature by 0.090°C. Moreover, with power addition, sedimentation rate in Area 1 increases by 261.43 m³/month in Alternative Model 1, while in Alternative Model 2, it decreases by 969.47 m³/month compared to the existing condition. Considering the ability of Alternative Model 2 to effectively reduce the temperature in the inlet canals by 0.090°C, it provides the best solution to contain the spread of hot water in the PLTGU Grati area. Currently, PLTGU Grati employs a Cutter Suction Dredger (CSD) to periodically dredge the water inlet channel. Therefore, Alternative Model 2 is recommended as the optimal choice among the alternatives. Henceforth, detailed studies related to current patterns and sedimentation rates are presented comprehensively in this paper.
Numerical Simulation of the Effect of Topographic Changes on Sandspit Intrusion Processes Peer-reviewed

Stephan Lawson, Keiko Udo, Hitoshi Tanaka

Proceedings of the 11th International Conference on Asian and Pacific Coasts APAC 2023, 14–17 November, Kyoto, Japan　525-535　2023/11/17
Publisher: Springer Nature Singapore
DOI： 10.1007/978-981-99-7409-2_47 　

ISSN： 2366-2557

eISSN： 2366-2565
Coastal Erosion Caused by River Mouth Migration on a Cuspate Delta: An Example from Thanh Hoa, Vietnam Peer-reviewed

Dinh Van Duy, Tran Van Ty, Cao Tan Ngoc Than, Cu Ngoc Thang, Huynh Thi Cam Hong, Nguyen Trung Viet, Hitoshi Tanaka

Hydrology　10　(9)　189-189　2023/09/18
Publisher: MDPI AG
DOI： 10.3390/hydrology10090189 　

eISSN： 2306-5338

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Coastal erosion poses a significant threat to the infrastructure of the coastal community at the mouth of the Ma River in Thanh Hoa Province, Vietnam. In response, emergency solutions such as hard, protective structures are often implemented. However, this approach exacerbates the problem as the underlying mechanisms of coastal erosion are not adequately investigated and understood. In this study, the long-term configuration of the mouth of the Ma River in Thanh Hoa Province, Central Vietnam, is investigated using Landsat imagery spanning from 1987 to 2023. An analytical solution of a one-line model for shoreline change was also used to examine the sand discharge from the Ma River and the diffusion coefficient for the sand transported along the shore by breaking waves. The results showed an asymmetric configuration of the mouth of the Ma River over the past 37 years. The supply of sand from the Ma River is around 350,000 m3/year. The majority of sand (ranging from 55% to 75%) is mainly transported to the northern beach of the Ma River delta. This uneven distribution of sand from the Ma River has led to the asymmetrical morphology of the delta apex in which the northern part of the Ma River delta is experiencing northward movement while the southern part of the Ma River Delta is moving southward and landward. The asymmetrical morphology of the delta at the mouth of the Ma River has recently been identified as the cause of severe coastal erosion. The diffusion coefficient value determined for the transportation of longshore sand along the deltaic lobes of the Ma River delta corresponds to 90 m2/day. This study offers a practical method for investigating morphological changes in cuspate deltas, especially when measured field data are limited.
Hydrologic-geotechnical modelling of shallow landslide and flood hazards caused by heavy rainfall Peer-reviewed

Nilo Lemuel J. Dolojan, Shuji Moriguchi, Masakazu Hashimoto, Nguyen Xuan Tinh, Hitoshi Tanaka, Kenjiro Terada

Engineering Geology　323　107184-107184　2023/09
Publisher: Elsevier BV
DOI： 10.1016/j.enggeo.2023.107184 　

ISSN： 0013-7952
Littoral Drift Impoundment at a Sandbar Breakwater: Two Case Studies along the Bight of Benin Coast (Gulf of Guinea, West Africa) Invited Peer-reviewed

Stephan K. Lawson, Keiko Udo, Hitoshi Tanaka, Janaka Bamunawala

Journal of Marine Science and Engineering　11　(9)　1651-1651　2023/08/24
Publisher: MDPI AG
DOI： 10.3390/jmse11091651 　

eISSN： 2077-1312

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This study assessed the deposition of sediment and shoreline evolution at two newly constructed port facilities in the Bight of Benin, West Africa. Based on the Building with Nature approach, the concept of a sandbar breakwater was implemented at the study sites. The coastal system of the bight is characterized by a sand barrier-lagoon system and a uniform prevailing wave climate, making it a favorable location for this innovative port solution. The case studies were undertaken at the Port of Lomé, Togo, and the Lekki Deep Sea Port (Dangote Sea Port), Nigeria, using remotely sensed shoreline positions and the one-line coastline change model for different periods. After construction of the breakwater, we estimated that the updrift coastline at the two locations accreted in the range of 10–23 m/year and the rates of sediment deposition were estimated to be in the magnitude of 1.0–7.0 × 105 m3/year. The comparative study conducted also showed that these rates could further reach a magnitude of 106 m3/year at other sediment-accreting landforms within the bight. We found that these large magnitudes of longshore sediment transport generated from very oblique incident waves (10°–20°) and sediment input from rivers (in orders of 106 m3/year) have enabled the realization of expected morphodynamic changes on the updrift shoreline of the ports. From these results, downdrift morphological changes should not be underestimated due to potential imbalances induced in the sedimentary budget along the coastline. Future developmental plans within the bight should also continuously aim to adopt nature-based solutions to protect the ecosystem while mitigating unforeseen implications.
Sand Spit Morphology at an Inlet on Phu Quoc Island, Vietnam Invited Peer-reviewed

Dinh Van Duy, Tran Van Ty, Tran Nhat Thanh, Huynh Vuong Thu Minh, Cao Van De, Vu Hoang Thai Duong, Trinh Cong Dan, Nguyen Trung Viet, Hitoshi Tanaka

Water　15　(10)　1941-1941　2023/05/20
Publisher: MDPI AG
DOI： 10.3390/w15101941 　

eISSN： 2073-4441

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Tidal inlets with attached sand spits are a very common coastal landform. Since the evolution of sand spits along coastlines influence the social-economic development of local coastal areas, sand spits have become the objects of numerous studies. However, previous studies have mainly focused on sand spits that are usually in the scale of hundreds of meters in width, whilst knowledge about the evolution of smaller-scale sand spits still remains limited. Therefore, in this study, the morphological change of a small and unexplored sand spit in front of Song Tranh Inlet on the west coast of Phu Quoc Island, Vietnam is investigated. Satellite images are first used to observe the morphological change of the sand spit and calculate the longshore sediment transport rates (LSTR) along the sand spit. Waves and beach sediments are collected at the study site to calculate the longshore sediment transport rate using the CERC formula. It is found that there is a seasonal variation in the evolution of the sand spit at Song Tranh Inlet. The longshore sediment transport rates along the spit calculated by image analysis are 39,000 m3/year, 66,000 m3/year, and 40,000 m3/year, whilst the longshore sediment transport rate calculated by the CERC formula is 72,000 m3/year. This study aims to contribute to the methodology for investigating the evolutions of small sand spits and, specifically, sustainable coastal management for Phu Quoc Island, which is well-known as the Pearl Island of Vietnam.
Evaluation of Cua Lo Estuary’s Morpho-Dynamic Evolution and Its Impact on Port Planning Invited Peer-reviewed

Dinh Nhat Quang, Nguyen Quang Duc Anh, Ho Sy Tam, Nguyen Xuan Tinh, Hitoshi Tanaka, Nguyen Trung Viet

Journal of Marine Science and Engineering　11　(3)　611-611　2023/03/13
Publisher: MDPI AG
DOI： 10.3390/jmse11030611 　

eISSN： 2077-1312

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Coastal erosion and accretion along the Quang Nam coast in Vietnam have been increasing in recent years, causing negative impacts on the inhabitants and local ecology. The Cua Lo estuary in Nui Thanh district has a complex hydrodynamic regime owing to its connection with two estuaries and three different tributaries. Therefore, a detailed study of the mechanisms and processes of these phenomena is crucial to understand the potential impact of a proposed 50,000-ton cargo port. In this study, the Delft3D model is employed to evaluate the morpho-dynamic changes in the area of Cua Lo under monsoon wave climate, storm, and flood conditions both before and after port and navigation channel construction. Results indicate that in the absence of the port, tidal currents and waves during monsoon storms cause significant erosion on the south bank and accretion on the north bank. Furthermore, the GenCade model is utilized to predict the future shoreline changes after the construction of two jetties. The model reveals that after 50 years of operation, the shoreline modifications will extend 449 m towards the sea, in comparison to natural conditions. However, the design of the northern jetty will ensure safe and proper operation without impacting the navigation channel. This study offers valuable insights into the morphological changes in the Cua Lo area and their potential implications, which can aid in the development of sustainable coastal management strategies for the region.
Analytical Eddy Viscosity Model for Turbulent Wave Boundary Layers: Application to Suspended Sediment Concentrations over Wave Ripples Invited Peer-reviewed

Rafik Absi, Hitoshi Tanaka

Journal of Marine Science and Engineering　11　(1)　226-226　2023/01/15
Publisher: MDPI AG
DOI： 10.3390/jmse11010226 　

eISSN： 2077-1312

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Turbulence related to flow oscillations near the seabed, in the wave bottom boundary layer (WBBL), is the phenomenon responsible for the suspension and transport of sediments. The vertical distribution of turbulent eddy viscosity within the WBBL is a key parameter that determines the vertical distribution of suspended sediments. For practical coastal engineering applications, the most used method to parameterize turbulence consists in specifying the shape of the one-dimensional-vertical (1DV) profile of eddy viscosity. Different empirical models have been proposed for the vertical variation of eddy viscosity in the WBBL. In this study, we consider the exponential-type profile, which was validated and calibrated by direct numerical simulation (DNS) and experimental data for turbulent channel and open-channel flows, respectively (Absi, 2021a,b). This model is generalized to the WBBL, and the period-averaged eddy viscosity is calibrated by a two-equation baseline (BSL) k-ω model for different conditions. This model, together with a β-function (where β is the inverse of the turbulent Schmidt number), is used in modeling suspended sediment concentration (SSC) profiles over wave ripples, where field and laboratory measurements of SSC show two kinds of concentration profiles depending on grain particles size. Our study shows that the convection–diffusion equation, for SSC in WBBLs over sand ripples with an upward convection term, reverts to the classical advection–diffusion equation (ADE) with an “apparent” sediment diffusivity εs*=α εs related to the sediment diffusivity εs by an additional parameter α associated with the convective sediment entrainment process over sand ripples, which is defined by two equations. In the first, α depends on the relative importance of upward convection related to coherent vortex shedding and downward settling of sediments. When the convective transfer is very small, above low-steepness ripples, α≈1. In the second, α depends on the relative importance of coherent vortex shedding and random turbulence. When random turbulence is more important than coherent vortex shedding, α≈1, and “apparent” sediment diffusivity reverts to the classical sediment diffusivity εs*≈ εs. Comparisons with experimental data show that the proposed method allows a good description of both SSC for fine and coarse sand and “apparent” sediment diffusivity εs*.
Comparison between Slip Distributions in the 2011 Tohoku Earthquake Tsunami Evaluated by Different Methods for Considering Tsunami Generation by Horizontal Crustal Displacement Peer-reviewed

Yoko MICHIGUCHI, Hideharu SUGINO, Yuta MITOBE, Hitoshi TANAKA

Journal of Japan Association for Earthquake Engineering　22　(5)　25-42　2022/11/30
Numerical Modeling of Seawater Intrusion in Wadi Al-Jizi Coastal Aquifer in the Sultanate of Oman Peer-reviewed

Javed Akhtar, Ahmad Sana, Syed Mohammed Tauseef, Hitoshi Tanaka

Hydrology　9　(12)　211-211　2022/11/27
Publisher: MDPI AG
DOI： 10.3390/hydrology9120211 　

eISSN： 2306-5338

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The Sultanate of Oman is an arid country in the Arabian Peninsula suffering from insufficient freshwater supplies and extremely hot weather conditions. The only source of recharge is rainfall, which is scarce and varies with space and time, for the aquifers being overexploited for the last few decades. This has led to depleting groundwater levels and seawater intrusion into coastal aquifers. In the present study, Ground Modeling System (GMS) was employed in Wadi Al-Jizi, which is one of the important aquifers in the Al Batinah coastal plain that caters to the needs of the country’s 70% agriculture. MODFLOW and MT3DMS were used to simulate the groundwater levels and solute transport, respectively. These models were calibrated under steady and transient conditions using observed data from twenty monitoring wells for a period of seventeen years (year 2000–2016). After validation, the model was utilized to predict the salinity intrusion due to changes in groundwater abstraction rates and sea level rise owing to climatic change. These predictions show that, by the year 2040, salinity intrusion (TDS > 12,800 mg/L) will transgress by 0.80 km inland if the current abstraction rates are allowed to be maintained. Further deterioration of groundwater quality is anticipated in the following years due to the increased pumping rates. The models and the results from the present study may be utilized for the effective management of groundwater resources in the Wadi Al-Jizi aquifer.
Tracking the Historical Opening and Closure of Inlets along the Coast of Ghana Peer-reviewed

Stephan Korblah LAWSON, Keiko UDO, Hitoshi TANAKA

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　78　(2)　I_1099-I_1104　2022/11/15
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.78.2_i_1099 　

ISSN： 1884-2399

eISSN： 1883-8944
TSUNAMI PROPAGATION INTO RIVERS IN TOHOKU AREA DURING THE 2022 TONGA VOLCANO-TSUNAMI Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　78　(2)　I_151-I_156　2022/11/15
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.78.2_i_151 　

ISSN： 1884-2399

eISSN： 1883-8944
BOTTOM BOUNDARY LAYER CHARACTERISTICS UNDER TSUNAMI WITH FLOW REGIME TRANSITION AND DEPTH-LIMITATION Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　78　(2)　I_61-I_66　2022/11/15
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.78.2_i_61 　

ISSN： 1884-2399

eISSN： 1883-8944
Tsunami Damping due to Bottom Friction Considering Flow Regime Transition and Depth-Limitation in a Boundary Layer Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Ahmad Sana

Journal of Marine Science and Engineering　10　(10)　1433-1433　2022/10/05
Publisher: MDPI AG
DOI： 10.3390/jmse10101433 　

eISSN： 2077-1312

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According to recent investigations on bottom boundary layer development under tsunami, a wave boundary can be observed even at the water depth of 10 m, rather than a steady flow type boundary layer. Moreover, it has been surprisingly reported that the tsunami boundary layer remains laminar in the deep-sea area. For this reason, the bottom boundary layer under tsunami experiences two transitional processes during the wave shoaling: (1) flow regime transition in a wave-motion boundary layer from laminar to the turbulent regime, and (2) transition from non-depth-limited (wave boundary layer) to depth-limited boundary layer (steady flow boundary layer). In the present study, the influence of these two transition processes on tsunami wave height damping has been investigated using a wave energy flux model. Moreover, a difference of calculation results by using the conventional steady flow friction coefficient was clarified.
A Theory for Estuarine Delta Formation with Finite Beach Length under Sediment Supplied from the River Peer-reviewed

Dinh Van Duy, Hitoshi Tanaka, Magnus Larson, Nguyen Trung Viet

Journal of Marine Science and Engineering　10　(7)　947-947　2022/07/10
Publisher: MDPI AG
DOI： 10.3390/jmse10070947 　

eISSN： 2077-1312

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Analytical solutions for a one-line model for shoreline changes are employed to investigate the formation of two wave-dominated river delta coastlines, along with a small-scale laboratory experiment. Since the present analytical solution can be applied only to a river delta with infinite shorelines, a new analytical solution was developed to consider the effects of lateral boundaries to the evolution of delta coastlines. It was determined that two demarcations represented by the dimensionless times t* can be used to judge whether the lateral boundaries have affected the coastline evolution or not. After the successful application of a new analytical solution to the experimental data, the new analytical solution was applied to predict the formation and deformation of the shorelines of the Ombrone River and Funatsu River deltas. Results obtained from the analysis showed that the new analytical solution can be used to describe well the formation and deformation of finite river-delta shorelines. Based on the two demarcations as represented by the dimensionless time t*, the shorelines of the Ombrone River and Funatsu River deltas are classified as finite shorelines.
A CONSIDERATION ON RANDOM WAVE PRESSURE CALCULATION FORMULA AFTER WAVE BREAKING ACTING ON SEAWALL ON LAND SIDE OF SHORELINE Peer-reviewed

Kenya TAKAHASHI, Toshimasa ISHII, Hitoshi TANAKA

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　78　(2)　I_427-I_432　2022/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.78.2_i_427 　

eISSN： 2185-4688
Morphology Recovery and Convergence of Topographic Evolution in the Natori River Mouth after the 2011 Tohoku Tsunami Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh

Water　14　(5)　715-715　2022/02/24
Publisher: MDPI AG
DOI： 10.3390/w14050715 　

eISSN： 2073-4441

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The 2011 Great East Japan earthquake and tsunami caused significant damage along the coastal region in Miyagi Prefecture. In the Natori River of Miyagi Prefecture, the recovery process of the estuarine morphology has been observed since the tsunami arrived. In this study, detailed analyses of collected aerial photographs and beach topography in front of the river mouth were conducted to evaluate whether the river mouth has reached a new equilibrium. The shoreline analysis suggests that the river mouth has obtained an equilibrium state after 2014 in which the sediment volume can be preserved within the littoral system. In addition, the convergence process to the stable topography was detected by the first spatial and temporal eigenfunctions obtained from the empirical orthogonal function (EOF) analysis of the beach profiles. From the results, it can be concluded that the river mouth has obtained a new equilibrium of morphology after the tsunami. As the recurrence of the tsunami can be expected in the next several centuries, the findings of this study can be useful for long-term coastal and riverine management against future disasters in this river mouth, and other coastal regions that are prone to large-scale disasters in the near future.
Numerical Study on the Turbulent Structure of Tsunami Bottom Boundary Layer Using the 2011 Tohoku Tsunami Waveform Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Xiping Yu, Guangwei Liu

Journal of Marine Science and Engineering　10　(2)　173-173　2022/01/27
Publisher: MDPI AG
DOI： 10.3390/jmse10020173 　

eISSN： 2077-1312

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In this study, the tsunami-induced bottom boundary layer was investigated based on actual waveforms obtained by the GPS buoys along the coast of the Tohoku region during the 2011 Great East Japan Earthquake tsunami. The k-ω model was utilized for the numerical analysis in this study. As a result, the tsunami boundary layer thickness was found to be extremely thin compared to the water depth. The velocity distribution was similar to that of the bottom boundary layer under wind-generated waves. The flow regime is located in the transition from smooth turbulence to rough turbulence. Because of this, the gradient of the flow across the layer is much greater than the gradients in the steady flow direction. Therefore, the bottom friction is underestimated if the steady friction factor, such as in the Manning formula, is used. This study proposes a new simple method for calculating the bottom shear stress due to an irregular tsunami based on the wave friction law, and the k-ω model results are used to validate the proposed methods.
STUDY ON TSUNAMI-INDUCED BOUNDARY LAYER USING MEASURED WAVEFORM OBTAINED BY GPS BUOYS Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH, Xipin YU, Guangwei LIU, Yuichi NAKAMURA

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　77　(2)　I_1195-I_1200　2021/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.77.2_i_1195 　

eISSN： 2185-467X
TOPOGRAPHY CONVERGENCE DURING RECOVERY PROCESS IN THE NATORI RIVER MOUTH AFTER THE GREAT EAST JAPAN EARTHQUAKE AND TSUNAMI Peer-reviewed

Nguyen Trong HIEP, Hitoshi TANAKA, Nguyen Xuan TINH, Nobuyuki SUTO

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　77　(2)　I_1117-I_1122　2021/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.77.2_i_1117 　

eISSN： 2185-467X
EVALUATION OF SANDSPIT GROWTH AND LONGSHORE SEDIMENT TRANSPORT RATES AT THE “BOUCHE DU ROI” INLET, BENIN, USING REMOTELY SENSED IMAGES Peer-reviewed

Stephan Korblah LAWSON, Hitoshi TANAKA, Keiko UDO, Nguyen Trong HIEP, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　77　(2)　I_667-I_672　2021/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.77.2_i_667 　

eISSN： 2185-467X
Preface Peer-reviewed

Kim Dan Nguyen, Sylvain Guillou, Hitoshi Tanaka, Damien Pham-Van-Bang

International Journal of Sediment Research　36　(6)　iii-vi　2021/12
Publisher: Elsevier BV
DOI： 10.1016/s1001-6279(21)00041-x 　

ISSN： 1001-6279
SANDSPIT ELONGATION AND LITTORIAL DRIFT AT THE VOLTA RIVER MOUTH, GHANA Peer-reviewed

Stephan LAWSON, Hitoshi TANAKA, Keiko UDO, Nguyen Trong HIEP, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　77　(2)　I_541-I_546　2021/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.77.2_i_541 　

ISSN： 1884-2399

eISSN： 1883-8944
ALTERATION IN SEDIMENT TRANSPORT AND SEDIMENT BUDGET IN THE NARUSE RIVER AFTER THE 2011 GREAT EAST JAPAN EARTHQUAKE AND TSUNAMI Peer-reviewed

Nguyen Trong HIEP, Hitoshi TANAKA, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　77　(2)　I_535-I_540　2021/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.77.2_i_535 　

ISSN： 1884-2399

eISSN： 1883-8944
BOTTOM BOUNDARY LAYER CHARACTERISTICS UNDER THE MEASURED 2011 TSUNAMI WAVEFORM Peer-reviewed

Nguyen Xuan TINH, Hitoshi TANAKA

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　77　(2)　I_163-I_168　2021/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.77.2_i_163 　

ISSN： 1884-2399

eISSN： 1883-8944
Morphodynamics and Evolution of Estuarine Sandspits along the Bight of Benin Coast, West Africa Peer-reviewed

Stephan Korblah Lawson, Hitoshi Tanaka, Keiko Udo, Nguyen Trong Hiep, Nguyen Xuan Tinh

Water　13　(21)　2977-2977　2021/10/21

DOI： 10.3390/w13212977 　

eISSN： 2073-4441
Long-Term Shoreline Evolution Using DSAS Technique: A Case Study of Quang Nam Province, Vietnam Peer-reviewed

Dinh Nhat Quang, Vu Huong Ngan, Ho Sy Tam, Nguyen Trung Viet, Nguyen Xuan Tinh, Hitoshi Tanaka

Journal of Marine Science and Engineering　9　(10)　1124-1124　2021/10/14
Publisher: MDPI AG
DOI： 10.3390/jmse9101124 　

eISSN： 2077-1312

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A Quang Nam coastline, located in the central of Vietnam, has been strongly affected by severe erosion and accretion due to climate change and human activities. Thus, understanding the causes and mechanisms of coastal morphology changes is essential to offer optimal coastal management and protection solutions. In this research, the Digital Shoreline Analysis System (DSAS) technique developed by the United States Geological Survey was adopted to calculate rate-of-change statistics from multiple historical coastline positions of Quang Nam province extracted from satellite images, i.e., Landsat and Sentinel images from 1990 to 2019. The coastal dynamic was digitized, visualized, and compared by two statistical parameters provided in DSAS, namely End Point Rate (EPR) and Linear Regression Rate (LRR). The final results reveal that the Quang Nam coast experienced remarkable phenomena of erosion and accumulation over the past three decades. The total number of erosional and accretional transects obtained from the EPR results are 401 and 414, with annual change rates of −1.7 and 0.77 m/year, respectively. The LRR parameter was also considered and illustrated a significant correlation with the EPR, as the obtained R2 value of 0.96. The lowest value of EPR over the period 1990–2019 is −42.4 m/year, highlighting the most significant erosion at the north of Cua Dai estuary, whereas coastline advance is recorded in the south segment. As a result, this study’s outcomes provide helpful information for better and sustainable coastal management in Quang Nam province of Vietnam.
Analytical solution for time-dependent shoreline position response to the tectonic recovery process in the Sendai Plain, Japan, after the 2011 Great East Japan Earthquake Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Magnus Larson

Continental Shelf Research　104603-104603　2021/10
Publisher: Elsevier BV
DOI： 10.1016/j.csr.2021.104603 　

ISSN： 0278-4343
Advanced Machine Learning Techniques for Predicting Nha Trang Shorelines Peer-reviewed

Cheng Yin, Le Thanh Binh, Duong Tran Anh, Son T. Mai, Anh Le, Van-Hau Nguyen, Van-Chien Nguyen, Nguyen Xuan Tinh, Hitoshi Tanaka, Nguyen Trung Viet, Long D. Nguyen, Trung Q. Duong

IEEE Access　9　98132-98149　2021/07
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/access.2021.3095339 　

eISSN： 2169-3536
Morphology recovery of the Abukuma River mouth after the 2011 Tohoku tsunami under the interaction between sand spit and sand terrace Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh

Coastal Engineering Journal　1-18　2021/06/12
Publisher: Informa UK Limited
DOI： 10.1080/21664250.2021.1937902 　

ISSN： 2166-4250

eISSN： 1793-6292
AN EXPERIMENTAL STUDY ON STRUCTURAL RESISTIVENESS AGAINST TSUNAMI ACTION OF PORT SIDE ARMOR BLOCK OF SLOPING BREAKWATER Peer-reviewed

Kenya TAKAHASHI, Hitoshi TANAKA

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　77　(2)　I_109-I_114　2021/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.77.2_i_109 　

eISSN： 2185-4688
INVESTIGATION ON DEVELOPMENT OF DEPTH-LIMITED WAVE BOUNDARY LAYER OVER A SMOOTH BOTTOM Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH, Xiping YU, Guangwei LIU

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　77　(2)　I_79-I_84　2021/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.77.2_i_79 　

eISSN： 2185-4688
Numerical implementation of wave friction factor into the 1D tsunami shallow water equation model Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Xiping Yu, Guangwei Liu

Coastal Engineering Journal　1-13　2021/05/05
Publisher: Informa UK Limited
DOI： 10.1080/21664250.2021.1919391 　

ISSN： 2166-4250

eISSN： 1793-6292
Using Hybrid Wavelet-Exponential Smoothing Approach for Streamflow Modeling Peer-reviewed

Vahid Nourani, Hessam Najafi, Alireza Babaeian Amini, Hitoshi Tanaka

Complexity　2021　1-17　2021/04/26
Publisher: Hindawi Limited
DOI： 10.1155/2021/6611848 　

ISSN： 1076-2787

eISSN： 1099-0526

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Considering the three intrinsic components (of autoregressive, seasonality, and error) of streamflow time series, the overall performance of the streamflow modeling tool is associated with the correct estimation of these components. In this study, a new hybrid method based on the wavelet transform (WT) as a multiresolution forecasting tool and exponential smoothing (ES) method, with two presented scenarios (WES1 and WES2), was introduced. To this end, the performance of the proposed method was investigated versus four conventional methods of the autoregressive integrated moving average (ARIMA), ES ad-hoc, artificial neural network (ANN), and wavelet-ANN (WANN) for daily and monthly streamflow modeling of West Nishnabotna and Trinity River watersheds with different hydro-geomorphological conditions. In the presented WES technique, firstly, WT is employed for decomposing the observed signal to one approximation (deterministic trend) and more diverse components of subseries (each at a specific frequency). Then, for the first scenario (WES1), only two subseries are introduced to the model as input parameters; however, for the second scenario (WES2), decomposed subseries are separately used as the inputs of ES models. The obtained results indicated that combining WT with the ES method and ANN led to more accurate modeling. The proposed methodology (WES2) that used all decomposed subseries separately improved the efficiency of models up to 30% and 10% for the daily dataset and up to 88% and 57% for the monthly dataset, respectively, for the West Nishnabotna and Trinity Rivers.
Centennial to Multi-Decadal Morphology Change and Sediment Budget Alteration with Consideration of the Impacts of the 2011 Tohoku Earthquake Tsunami along the Nobiru Coast, Japan Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh

Journal of Marine Science and Engineering　9　(3)　265-265　2021/03/02
Publisher: MDPI AG
DOI： 10.3390/jmse9030265 　

eISSN： 2077-1312

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The Nobiru Coast is situated on the southwest of the Ishinomaki Bay. The 2011 Great East Japan Tsunami severely devastated the Nobiru Coast and the adjacent Naruse River mouth. In this study, an investigation was conducted based on the available historic maps and images combined with in situ surveys that revealed the century-to-decade morphology change and sediment budget alteration in the Nobiru Coast. During the past two centuries, the longshore transport on the northeast coast and sediment supply from the Naruse River were the principal sediment supply onto the Nobiru Coast and the estimated annual net sediment input into the coast was 87,000 m3/y. Until several decades ago, the construction of the Ishinomaki Port and the erosion preventing constructions (breakwaters, headlands) along the Ohmagari Coast on the northeast areas caused a dramatic reduction of longshore transport to the Nobiru Coast. Hence, the net sediment input fell to 46,000 m3/y. After the tsunami, the sediment input was further reduced to 29,000 m3/y and this loss was closely related to the intruded sediment into the Naruse River. The outcomes of this study are highly valuable for the government authorities to manage the long-term coastal and riverine morphological changes after the 2011 tsunami.
Prediction Interval Estimation Methods for Artificial Neural Network (ANN)-Based Modeling of the Hydro-Climatic Processes, a Review Peer-reviewed

Vahid Nourani, Nardin Jabbarian Paknezhad, Hitoshi Tanaka

Sustainability　13　(4)　1633-1633　2021/02/03
Publisher: MDPI AG
DOI： 10.3390/su13041633 　

eISSN： 2071-1050

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Despite the wide applications of artificial neural networks (ANNs) in modeling hydro-climatic processes, quantification of the ANNs’ performance is a significant matter. Sustainable management of water resources requires information about the amount of uncertainty involved in the modeling results, which is a guide for proper decision making. Therefore, in recent years, uncertainty analysis of ANN modeling has attracted noticeable attention. Prediction intervals (PIs) are one of the prevalent tools for uncertainty quantification. This review paper has focused on the different techniques of PI development in the field of hydrology and climatology modeling. The implementation of each method was discussed, and their pros and cons were investigated. In addition, some suggestions are provided for future studies. This review paper was prepared via PRISMA (preferred reporting items for systematic reviews and meta-analyses) methodology.
Numerical investigation of the effect of seasonal variations of depth-of-closure on shoreline evolution Peer-reviewed

Xuan Tinh Nguyen, Minh Thanh Tran, Hitoshi Tanaka, Trung Viet Nguyen, Yuta Mitobe, Cong Dien Duong

International Journal of Sediment Research　36　(1)　1-16　2021/02
Publisher: Elsevier BV
DOI： 10.1016/j.ijsrc.2020.03.016 　

ISSN： 1001-6279
Mechanisms of Flood-Induced Levee Breaching in Marumori Town during the 2019 Hagibis Typhoon Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Gen Abe, Yuka Okamoto, Kwanchai Pakoksung

Water　13　(2)　244-244　2021/01/19
Publisher: MDPI AG
DOI： 10.3390/w13020244 　

eISSN： 2073-4441
Development of Depth-Limited Wave Boundary Layers over a Smooth Bottom Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Xiping Yu, Guangwei Liu

Journal of Marine Science and Engineering　9　(1)　27-27　2020/12/29
Publisher: {MDPI} {AG}
DOI： 10.3390/jmse9010027 　

ISSN： 2077-1312

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<jats:p>A theoretical and numerical study is carried out to investigate the transformation of the wave boundary layer from non-depth-limited (wave-like boundary layer) to depth-limited one (current-like boundary layer) over a smooth bottom. A long period of wave motion is not sufficient to induce depth-limited properties, although it has simply been assumed in various situations under long waves, such as tsunami and tidal currents. Four criteria are obtained theoretically for recognizing the inception of the depth-limited condition under waves. To validate the theoretical criteria, numerical simulation results using a turbulence model as well as laboratory experiment data are employed. In addition, typical field situations induced by tidal motion and tsunami are discussed to show the usefulness of the proposed criteria.</jats:p>
MECHANISM OF EMBANKMENT BREACHING IN MARUMORI TOWN DUE TO TYPHOON HAGIBIS, 2019 Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH, Yuka OKAMOTO, Kwanchai PAKOKSUNG

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　76　(1)　177-188　2020/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.76.1_177 　

eISSN： 2185-467X
Intrusion Distance and Flow Discharge in Rivers during the 2011 Tohoku Tsunami Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Nguyen Trong Hiep, Kosuke Kayane, Min Roh, Makoto Umeda, Mikio Sasaki, Seiki Kawagoe, Mitsukuni Tsuchiya

Journal of Marine Science and Engineering　8　(11)　882-882　2020/11/05
Publisher: MDPI AG
DOI： 10.3390/jmse8110882 　

ISSN： 2077-1312

eISSN： 2077-1312

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On 11 March 2011, the Great East Japan Earthquake generated huge tsunami waves. Then, tsunami propagation occurred in rivers, resulting in further expansion of the flooded area. Full data sets of tsunami characteristics such as tsunami inland and river propagation distances as well as the river geometries from all rivers within the Tohoku District were compiled and analyzed. It was found that tsunami propagation distance in rivers was about 1.2 to 4.5 times that of the inland area. There was a good correlation between propagation distance in rivers and the river bed slope. Furthermore, new empirical formulae for calculating the damping coefficient of tsunami wave height and tsunami intrusion length were successfully derived based on the current comprehensive data sets covering a wide range of river geometry and bottom slope. Moreover, tsunami-induced flow discharge was evaluated by using measured water level variation.
STUDY ON FLOW REGIME IN A SEA BOTTOM BOUNRAY LAYER BENEATH TSUNAMI Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　76　(2)　I_397-I_402　2020/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.76.2_i_397 　

ISSN： 1884-2399

eISSN： 1883-8944

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 In this paper, we investigated the development process of the tsunami-induced bottom boundary layer under the one-dimensional tsunami propagation from the tsunami source to the shallow water. Two simulation methods for the tsunami shoaling process are ultilized; one is calculated by the Green's law and the other one is from the results of the shallow water equation model. Based on the analyzed results, it is found that the tsunami-induced bottom boundary layer at the tsunami source area is laminar flow state at first and then gradually becomes the smooth tubuluent and transition flows in the shallow region. As a result, a simple assumption of rough turbulent regime, as commonly assumed in Manning's formula, might not be valid. It is also found that the tsunami-induced bottom shear stress by the steady friction law, which is frequently used in the numerical calculation of tsunami, has no correlation with estimation in the present method.
Mechanisms of Formation and Development of a New Island in front of Thu Bon River Mouth, Quang Nam Province, Vietnam Peer-reviewed

Duong Cong DIEN, Nguyen Xuan TINH, Hitoshi TANAKA, Nguyen Trung VIET

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　76　(2)　I_619-I_624　2020/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.76.2_i_619 　

ISSN： 1884-2399

eISSN： 1883-8944

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 Thu Bon River delta is located at Quang Nam Province in the central region of Vietnam. Cua Dai coastal area has a long coastline from Son Tra Peninsula to An Hoa Cape. This nearly 100 km long coastline plays a significant role in the economic development of the Quang Nam Province. In recent years, coastal erosion along Cua Dai Beach has become severe. On November 05, 2017, The Damrey Typhoon attacked the central region of Vietnam causing an extreme rainfall and river flood in the Thu Bon river basin. About two months after the typhoon, a new island, or as called "Dinosaur Island" was formed at the Cua Dai River mouth. The formation and development of this new island cause a big problem for navigation transportation. Therefore, this study aims to investigate the causing mechanism and the development of the new island. As a result, the formation of the island is due to two processes; shallower sand terrace area due to the river sediment deposition after the flood and the sediment accumulation due to the wave actions. The area of the new island is increasing and it tends to move to the north direction. Besides, the area of the north and south attachment bars are also increasing from the time of new island formation. These findings are really useful information for the local river and coastal authorities to find the best countermeasure solutions to overcome the current situation.
SEDIMENT MOVEMENT AT THE KITAKAMI RIVER MOUTH AFTER THE 2011 TOHOKU TSUNAMI AND ITS MODELING Peer-reviewed

Nguyen Trong HIEP, Hitoshi TANAKA, Nguyen Xuan TINH

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　76　(2)　I_625-I_630　2020/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.76.2_i_625 　

ISSN： 1884-2399

eISSN： 1883-8944

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 The Kitakami River mouth is one of the river mouths where the recovery process has been ineffective since the 2011 Tohoku Tsunami. Deep water depth around the sand spit and specific wave directions are the reasons for the slow restoration of morphology to its former situation. This study provides a thorough understanding of the morphology change at the Kitakami River mouth after the 2011 Tsunami as well as the longshore sediment transport towards the sand spit by analysing aerial photographs and satellite images. Moreover, a mathematical model is applied in order to reproduce the shoreline development of the sand spit at the Kitakami River mouth during the recovery period.
Collapse of Sand Spit at the Kalu River Mouth in Kalutara, Sri Lanka Peer-reviewed

Nguyen Xuan TINH, Chaminda SAMARASURIYA, Hitoshi TANAKA

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　76　(2)　I_643-I_648　2020/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.76.2_i_643 　

ISSN： 1884-2399

eISSN： 1883-8944

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 Kalutara is a major city in Kalutara District, Western Province in Sri Lanka. It is located in approximately 40km south of the capital Colombo. This area is very famous for the Kalutara Bodhiya Temple and a long sand spit formed at the entrance of the Kalu River. These two places are the symbols of Kalutara city and very attractive destinations both for domestic and international tourists. However, very recently, the sand spit has collapsed due to the impacts of the flood on May 26, 2017. Until present, the sand spit morphology has not recovered yet. The disappearance of the sand spit causes a big socio-economic problem not only to the salinity intrusion further upstream of the Kalu River but also reduce the tourist attraction. Therefore, this study aims to figure out the long-term and short-term sand spit morphological evolutions after the flood of the in Kalutara. This is vital importance before making any countermeasure plans to restore the former sand spit in Kalutara, Sri Lanka.
EXPERIMENTAL STUDY ON STRUCTURAL RESISTIVENESS AGAINST WAVE ACTION OF PORT SIDE ARMOR BLOCK OF SINGLE LAYER WAVE DISSIPATING CONCRETE BLOCK COVERED SLOPING BREAKWATER Peer-reviewed

Kenya TAKAHASHI, Hiroshi SANUKI, Hiroki SUGAHARA, Go TAKADOI, Tomokuni NAKAMURA, Hiroyuki KUMATA, Naoki CHIBA, Shuhei TERASHIMA, Hitoshi TANAKA

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　76　(2)　I_811-I_816　2020/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.76.2_i_811 　

ISSN： 1884-2399

eISSN： 1883-8944
RELATIONSHIP BETWEEN SALINITY CHANGE AND ECOSYSTEM RECOVRY AT THE MOUTH OF NATORI RIVER AFTER THE 2011 TOHOKU TSUNAMI

Ryotaro IWAMURA, Hitoshi TANAKA, Nguyen Xuan TINH, Kinuko ITO

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　76　(2)　I_985-I_990　2020/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.76.2_i_985 　

ISSN： 1884-2399

eISSN： 1883-8944

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 It is known that the mouth of the Natori River has a role as a habitat for marine fry. However, due to the 2011 Great East Japan Earthquake Tsunami, large erosion occurred, and then topographic changes such as sedimentation at the river mouth occurred. It is feared that the large-scale change of the estuary topography due to the Great East Japan Earthquake had a great influence on the function of supporting the fisheries resources in the tidal area of the estuary. Therefore, in this study, in order to clarify the correspondence between salinity changes due to topographical changes in the Natori River estuary and the recovery status of the clams inhabiting the Natori River estuary, we analyzed and simulated the measured data. As a result, it was found that the salinity in the tidal region of the Natori River changed due to the effects of the Great East Japan Earthquake tsunami and subsequent topographic changes. It was also found that the number of clams corresponded to the period when salinity was 15 or less, and that the number of clams was difficult to recover in the presence of high flow events.
Numerical study of nearshore hydrodynamics and morphology changes behind offshore breakwaters under actions of waves using a sediment transport model coupled with the SWASH model Peer-reviewed

Phung Dang Hieu, Vinh N. Phan, Viet T. Nguyen, Thanh V. Nguyen, H. Tanaka

Coastal Engineering Journal　1-13　2020/10/05
Publisher: Informa UK Limited
DOI： 10.1080/21664250.2020.1828016 　

ISSN： 2166-4250

eISSN： 1793-6292
Comprehensive Study of the Sand Spit Evolution at Tidal Inlets in the Central Coast of Vietnam Peer-reviewed

Nguyen Quang Duc Anh, Hitoshi Tanaka, Ho Sy Tam, Nguyen Xuan Tinh, Tran Thanh Tung, Nguyen Trung Viet

Journal of Marine Science and Engineering　8　(9)　722-722　2020/09/18
Publisher: MDPI AG
DOI： 10.3390/jmse8090722 　

ISSN： 2077-1312

eISSN： 2077-1312

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Tidal inlets along the central coast of Vietnam are located in a microtidal, wave-dominated coastal environment. In addition, the Vietnam coast is highly influenced by the seasonal monsoon regime, which is characterized by large northeast waves from October to March and calm southeast waves from April to September every year. Consequently, the tidal inlet entrance morphologies often suffer from a dynamic seasonal evolution due to distinct differences in the direction of wave-induced longshore sediment transport (LST) between the two monsoon seasons. The migration or closure of tidal inlets causes a lot of problems for socio-economic development in the region since these are the main reasons leading to an increase in the risk of coastal flooding and the obstruction of navigation. This paper presents a comprehensive study of the morphological evolutions of natural tidal inlets on the central coast of Vietnam using long-term remote sensing data sets and by the Delft3D numerical model. Surprisingly, the estimated LST rates from the former method are in an order of magnitude agreement with the results from the latter one for all of the areas in this study. Based on the conservation equation for sand and comprehensive data collection, a new simple empirical formula for predicting the sand spit elongation rate as a function of the sand spit width is developed. Although the breaching of sand spit might happen during an extreme flood event at some tidal inlets, the growth rate of the spit before and after the breaching is almost unchanged. These findings are very useful information for supporting the local coastal authorities to find better management solutions in terms of sustainable development.
Transitional Behavior of a Flow Regime in Shoaling Tsunami Boundary Layers Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Ahmad Sana

Journal of Marine Science and Engineering　8　(9)　700-700　2020/09/09
Publisher: MDPI AG
DOI： 10.3390/jmse8090700 　

eISSN： 2077-1312

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The transitional flow regime of the bottom boundary layer under hypothetical shoaling tsunamis is investigated in the entire region from the tsunami source to the shallow sea area. In order to calculate the shoaling process of a tsunami, an analytical method based on Green’s law and the linear long wave theory are employed, and flow regime criteria for the wave boundary layer proposed by one of the authors are applied. It is found that the bottom boundary layer in a tsunami source area is located in the laminar regime. Subsequently, transition occurs to the smooth turbulence during the shoaling process, with a transition from the smooth to the rough turbulent region in the shallow area. For precise evaluation of bottom friction acting on the sea bed and the resulting energy dissipation beneath the tsunami, it is highly necessary to include such transitional behavior in sea bottom boundary layers.
SAND SPIT EVOLUTION AT THE KEN INLET AND PHAN INLET, CENTRAL VIETNAM Peer-reviewed

Nguyen Quang, DUC ANH, Hitoshi TANAKA, Nguyen Xuan TINH, Nguyen Trung VIET

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)　76　(5)　I_75-I_80　2020/08
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejer.76.5_i_75 　

eISSN： 2185-6648
EVOLUTION OF NOBIRU COAST AFTER THE 2011 TSUNAMI IMPACT Peer-reviewed

Hitoshi TANAKA, Nguyen Xuan TINH, Nguyen Trong HIEP

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)　76　(5)　I_43-I_48　2020/08
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejer.76.5_i_43 　

eISSN： 2185-6648
Improvement of the full-range equation for wave boundary layer thickness Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Ahmad Sana

Journal of Marine Science and Engineering　8　(8)　2020/08

DOI： 10.3390/JMSE8080573 　

eISSN： 2077-1312
Decadal morphological recovery of estuaries and coasts after the 2011 tohoku tsunami Peer-reviewed

Hitoshi Tanaka, Trong Hiep Nguyen

Lecture Notes in Civil Engineering　80　31-41　2020/07

DOI： 10.1007/978-981-15-5144-4_2 　

ISSN： 2366-2557

eISSN： 2366-2565
CHARACTERISTICS OF BOTTOM SHEAR STRESS VARIATION UNDER SHOALING SOLITARY WAVE

TANAKA Hitoshi, TINH Nguyen Xuan, NISHIWAKI Ryo, WATANABE Kazuya

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　76　(2)　I_150-I_155　2020/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.76.2_I_150 　

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 In the coastal environments, detailed understanding of current or wave-induced bottom shear stresses, which are often associated to the steady friction law and wave friction law respectively, is essential to evaluate quantitatively the sediment transport and coastal morphological changes. Many previous studies have indicated that there was an influence of unsteady characteristics in the boundary layer beneath a long-period wave. Therefore, the bottom shear stress under shoaling tsunami should be considered the unsteady wave-like effects. A new correction approach has been proposed by comparing the wave friction factor to the steady friction factor. The current study aims to implement the new correction method for assessing the bed shear stress to the conventional model for tsunami. Application for a solitary wave, which propagates from the tsunami source to the shore, shows that bottom shear stress by the new method is ten times larger than the conventional method in a deep water and become smaller in shallow area. In addition, the location of the critical Shields parameter of 0.05 by the new method is situated in deeper water than the conventional method.
SAND SPIT EVOLUTION AT THE AN DU RIVER MOUTH, CENTRAL VIETNAM

Nguyen Quang DUC ANH, TANAKA Hitoshi, VIET Nguyen Trung, TUNG Tran Thanh, TINH Nguyen Xuan

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　76　(2)　I_234-I_239　2020/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.76.2_I_234 　

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 The An Du Estuary is located in Binh Dinh Province that is in the southern part of the Central of Vietnam. The location of An Du River mouth has been changing remarkably that caused a lot of problems for the navigation activities in this area. However, there was very limited data availability in this area making difficult to quantify the mechanism of sand spit growth or providing suitable countermeasure plans. In this study, the long-term morphological evolution of An Du sand spit was quantitatively examined by using the satellite images for about 30 years from September, 1988 to April, 2019. The analyzed results indicated that the southern sand spit was elongating to the north at an average speed of 140 m/year. Besides, the northern sand spit was retreating at almost the same speed. The sand spit was breached twice in the year of 1998 and 2005. The longshore sediment transport rates, that estimated by multiplying the changing rate of the sand spit area to the depth of active motion, are varying from 1.1 to 2.3x10⁵ m³/year depended on the breaching periods. These results show good agreement with the Delft3D numerical simulation results for this study area.
MODELING RIVER MOUTH EVOLUTION UNDER MIGRATION PROCESS Peer-reviewed

Nguyen Trong HIEP, Hitoshi TANAKA, Nguyen Trung VIET, Nguyen Xuan TINH, Tran Dinh HOA

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　76　(2)　I_431-I_438　2020/02
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.76.2_i_431 　

eISSN： 2185-4661
NUMERICAL MODEL FOR SIMULATING SAND TERRACE FORMATION IN FRONT OF THE CUA DAI RIVER MOUTH Peer-reviewed

Duong Cong Dien, Hitoshi Tanaka, Nguyen Trung Viet, Dinh Van Manh

PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, APAC 2019　587-592　2020

DOI： 10.1007/978-981-15-0291-0_81 　
Semi-analytic model of tidal-induced inlet flow and morphological evolution Peer-reviewed

Magnus Larson, Almir Nunes, Hitoshi Tanaka

Coastal Engineering　155　2020/01

DOI： 10.1016/j.coastaleng.2019.103581 　

ISSN： 0378-3839

eISSN： 1872-7379
RECOVERY PROCESS OF SANDSPIT AND SAND TERRACE AT THE ABUKUMA RIVER MOUTH AFTER THE 2011 TOHOKU TSUNAMI

HIEP Nguyen Trong, TANAKA Hitoshi, TINH Nguyen Xuan, YAMANAKA Takumi

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　75　(2)　I_673-I_678　2019/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.75.I_673 　

ISSN： 1884-2399

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 The 2011 Tohoku Tsunami triggered a tremendous morphology change at the Abukuma River mouth. By utilizing aerial photographs, it is found that the sandspit was flushed entirely by the intensive tsunami and its subsequent recovery took roughly 4 years to regain the pre-tsunami situation. On the other hand, the bathymetry data also stated that a significant amount of sediment about 6.0×10⁵ m³ was dissappeared due to the tsunami. In comparison with the recovery of the sandspit, the recovery of the sand terrace reflects a time lag of 3 years. In addition, as compred with pre-tsunami situation, the recovered sand terrace has smaller sand volume with different shape, which means sedimemt supply amount from the sand terrace to the surroundung sandy beach has also been modified compared with pre-tsunami condition.
NUMERICAL ANALYSIS OF BOTTOM BOUNDARY LAYER UNDER TSUNAMI

TINH Nguyen Xuan, TANAKA Hitoshi, SONG Wenzheng

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　75　(2)　I_13-I_18　2019/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.75.I_13 　

ISSN： 1884-2399

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 This study presents a numerical analysis of bottom boundary layer and shear stress under tsunami wave using a high-precision k-ω numerical model. The simulations have been made for hypothetical shoaling tsunami from the tsunami source area to nearshore region to investigate characteristics of the bottom shear stress acting on the sea bed. It is found that a very thin boundary layer is formed beneath tsunami at the tsunami source area and further developed as it propagates to the shallow region. On the other words, the tsunami boundary layer does not span entire the water column as assumed in the steady flow theory even though the long wave condition is fully satisfied. Consequently, the steady friction law is not valid in most entire computational domain although the shallow water equation is applicable. As a result, there are remarkably underestimated the bottom shear stress by the steady friction law due to the steep velocity gradient in the boundary layer. Therefore, it is necessary to take into account such unsteady boundary layer characteristics in the numerical simulation of tsunami wave and estimation of tsunami-induced bed shear stress in the nearshore region.
Morphological recovery of beach severely damaged by the 2011 great east Japan tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Estuarine, Coastal and Shelf Science　226　2019/10/15

DOI： 10.1016/j.ecss.2019.106274 　

ISSN： 0272-7714
Study on boundary layer development and bottom shear stress beneath a tsunami Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka

Coastal Engineering Journal　61　(4)　574-589　2019/10/02

DOI： 10.1080/21664250.2019.1672127 　

ISSN： 2166-4250

eISSN： 1793-6292
Corrigendum to “Full-range equation for wave boundary layer thickness” [Coast. Eng. 54 (2007) 639–642](S0378383907000130)(10.1016/j.coastaleng.2007.01.011) Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Coastal Engineering　152　2019/10

DOI： 10.1016/j.coastaleng.2019.103516 　

ISSN： 0378-3839
Full-range equation for wave boundary layer thickness (vol 54, pg 639, 2007) Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

COASTAL ENGINEERING　152　2019/10

DOI： 10.1016/j.coastaleng.2019.103516 　

ISSN： 0378-3839

eISSN： 1872-7379
STUDY ON EFFECTIVENESS OF ANTI-EROSION COUNTERMEASURES IN CUA DAI BEACH USING 3-DIMENSIONAL BEACH TRANSFORMATION MODEL Peer-reviewed

Tsuyoshi Nagasawa, Mai Thi Thu Thuy, Nguyen Trung Viet, Hitoshi Tanaka

PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, APAC 2019　815-821　2019/09

DOI： 10.1007/978-981-15-0291-0_112 　
BOUNDARY LAYER DEVELOPMENT UNDER BREAKING WAVE Peer-reviewed

Nguyen Thai Binh, Yuta Mitobe, Hitoshi Tanaka, Nguyen Xuan Tinh

PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, APAC 2019　767-771　2019/09

DOI： 10.1007/978-981-15-0291-0_105 　
Post-tsunami recovery and morphology change at Naruse river mouth, Japan Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of International Conference on Asian and Pacific Coasts　797-801　2019/09

DOI： 10.1007/978-981-15-0291-0_109 　
Sandspit intrusion and morphological recovery under the impact of the 2011 Tohoku Tsunami at Kitakami river mouth, Japan Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of International Conference on Asian and Pacific Coasts　803-808　2019/09

DOI： 10.1007/978-981-15-0291-0_110 　
Turbulent boundary layer development under tsunami, Proceedings of 5th International Conference in Ocean Engineering Invited Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of 5th International Conference in Ocean Engineering　2019/07
MOPHOLOGY CHANGE AND RECOVERY PROCESS OF SANDY COAST AND SANDSPIT AT THE NATORI RIVER MOUTH AFTER THE 2011 TSUNAMI Peer-reviewed

HIEP Nguyen Trong, TANAKA Hitoshi, TINH Nguyen Xuan, ITO Kinuko, YAMANAKA Takumi

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　75　(2)　I_797-I_802　2019/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.75.I_797 　

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 The Natori River mouth and sandy coast have encountered a large-scale morphological change since The Great East Japan Earthquake and Tsunami in 2011. The left sandy beach of river mouth along with the Idoura Lagoon was almost disappeared and the sandspit was flushed entirely by the tsunami. The subsequent recovery of the sandy beach and lagoon showed totally different morphology as compared with that used to be before the tsunami, including intrusion of large amount of sediment into the mouth. This morphology change caused reduction of river mouth width, raised serious concerns of water level rise during flood time and change of ecological environment in the tidal area. To examine the recovery process of the river mouth till now, this study, by using aerial photos, made a thorough analysis of the morphology variation of the Natori River mouth. It emphasized that although a 70m retreat of shoreline is seen, the recovered shape of the left sandy coast has been analogous to the pre-tsunami situation. Additionally, deposition between jetty and embankment was also observed due to wave overtopping.
Numerical study on sea bottom boundary layer and bed shear stress under tsunami Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of the International Offshore and Polar Engineering Conference　3　3189-3195　2019/06

ISSN： 1098-6189

eISSN： 1555-1792
Longshore propagation erosion of beach in the vicinity of tsunami-induced concave shoreline Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Journal of Hydro-Environment Research　23　1-9　2019/03/15

DOI： 10.1016/j.jher.2019.01.003 　

ISSN： 1570-6443

eISSN： 1876-4444
SAND SPIT ELONGATION AND BREACHING AT THE LY HOA RIVER MOUTH, NORTHERN VIETNAM

DUC ANH Nguyen Quang, DUY Dinh Van, TANAKA Hitoshi, VIET Nguyen Trung, HOA Tran Dinh, TINH Nguyen Xuan

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　75　(2)　I_739-I_744　2019/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.75.2_I_739 　

ISSN： 1880-8751

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 Sand spit elongation is remarkable at the mouth of Ly Hoa river, located in northern Vietnam, and sudden migration of the river mouth has sometimes been induced by sand spit breaching. In order to understand the frequency of spit breaching and subsequent spit reformation process, a series of Landsat and Google Earth images which has been accumulated since 1976 were analyzed to clarify the characteristic change of the estuary topography. In order to quantitatively investigate such characteristics, the tip coordinate and the area of the sand spit on the left of the estuary were calculated. From the satellite analysis, it is found that the river opening has been moved consistently to the down-drift direction, and its traveling speed has reached 90m/year. In particular, the area of the sandbar has increased remarkably, and the increasing rate is almost constant. Using this value, the rate of sand volume intruded into the river mouth by waves was estimated and it is almost consistent with longshore sediment transport rate along the surrounding sandy beach.
MECHANISM OF LATE RECOVERY OF RIVER MOUTH MORPHOLOGY AFTER THE 2011 TOHOKU TSUNAMI

HIEP Nguyen Trong, TANAKA Hitoshi, TINH Nguyen Xuan, MITOBE Yuta, SAITO Masahiro

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　75　(2)　I_733-I_738　2019/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.75.2_I_733 　

ISSN： 1880-8751

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 The 2011 Great East Japan Earthquake and Tsunami induced such intense devastation on many coastal regions and among them, the Naruse and Kitakami River mouths are the areas where their sandspits had not been recovered for a long period. This study, by analyzing aerial photos, has learned that the sandspit were vanished after being hit by the tsunami. Subsequently, waves were able to propagate further into the river mouth and sediment deposition was observed at the areas roughly hundred meters to 1 km upstream from the river mouth. Afterwards, the recovery of the sandspits has reflected similar process which sediment advances seawards. This phenomenon is observed in either the Abukuma River mouth in which the area was also damaged by the tsunami or the Mogami and Koyoshi River mouths where the jetties were constructed. Based on this study, the expected time for these areas to recover is evaluated as well.
One-Dimensional numerical simulation of tsunami propagation considering transition of a friction factor Peer-reviewed

Nguyen Xuan Tinh, Hitoshi TANAKA, Ryo NISHIWAKI, Kazuya WATANABE

Journal of Hydraulic Engineering, JSCE　64　I_697-702　2019/03
Publisher:
ISSN： 1880-8751
Sand spit morphological change of An Hai and Le Thinh inlets, Phu Yen Province, Central Vietnam

Anh Nguyen, Quang Duc, Tanaka Hitoshi, Tinh Nguyen Xuan, Viet Nguyen Trung

東北地域災害科学研究 = Tohoku journal of natural disaster science　55　73-78　2019/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Recent morphology change at Da Rang River mouth, Phu Yen, Vietnam

Hiep Nguyen Trong, Tanaka Hitoshi, Tinh Nguyen Xuan, Viet Nguyen Trung

東北地域災害科学研究 = Tohoku journal of natural disaster science　55　79-84　2019/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Prediction of shoreline change using a numerical model: case of the Kulon Progo Coast, Central Java Peer-reviewed

Asrini Chrysanti, Mohammad Bagus Adityawan, Widyaningtyas, Bagus Pramono Yakti, Joko Nugroho, Khilmi Zain, Iman Haryanto, Muhammad Sulaiman, Adhy Kurniawan, Hitoshi Tanaka

2ND CONFERENCE FOR CIVIL ENGINEERING RESEARCH NETWORKS (CONCERN-2 2018)　270　2019

DOI： 10.1051/matecconf/201927004023 　

ISSN： 2261-236X
Reduction effect of tsunami disaster by a new canal in the southern area of Abukuma River along Sendai Coast Peer-reviewed

Kiyoshi Hashimoto, Yoshitomo Suzuki, Hitoshi Tanaka

Journal of Japan Society of Civil Engineers, Ser.B3 (Coastal Eng.)　74　(2)　211-216　2018/11
Study on formation of river mouth terrace and subsequent landward sand movement Peer-reviewed

Kazuya Watanabe, Dinh Van Duy, Yoshiya Noguchi, Hitoshi Tanaka

Journal of Japan Society of Civil Engineers, Ser.B3 (Coastal Eng.)　74　(2)　787-792　2018/11
Analysis of shoreline change in Cua Dai beach by using Empirical Orthogonal Function Peer-reviewed

Tsuyoshi Nagasawa, Mai Thi Thu Thuy, Nguyen Trung Viet, Hitoshi Tanaka

Coastal Engineering Journal　60　(4)　548-565　2018/10/02

DOI： 10.1080/21664250.2018.1554202 　

ISSN： 2166-4250

eISSN： 1793-6292
Estuarine hydrodynamics and morphodynamics: A perspective Peer-reviewed

Hitoshi Tanaka, Hubert Chanson

Coastal Engineering Journal　60　(4)　385-386　2018/10/02

DOI： 10.1080/21664250.2018.1563323 　

ISSN： 2166-4250

eISSN： 1793-6292
Numerical experiments on effect of river mouth morphology on tsunami behavior in rivers Peer-reviewed

Yuta Mitobe, Hitoshi Tanaka, Kazuya Watanabe, Neetu Tiwari, Yasunori Watanabe

Coastal Engineering Journal　60　(4)　516-531　2018/10/02

DOI： 10.1080/21664250.2018.1531815 　

ISSN： 2166-4250

eISSN： 1793-6292
Numerical modeling of the sand spit at Cua Lo Inlet Peer-reviewed

Nguyen Quang Duc Anh, Hitohi Tanaka, Nguyen Trung Viet, Nguyen Xuan Tinh

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Water particle velocity under breaking bore Peer-reviewed

Nguyen Thai Binh, Hitoshi Tanaka, Yuta Mitobe, Nguyen Xuan Tinh

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Shoreline changes by using Google Earth images with tidal correction: A case study of Samui Island, Thailand Peer-reviewed

Patrakorn Nidhinarangkoon, Sompratana Ritphring, Hitoshi Tanaka

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Shifting of the Da Rang River mouth and its relationship with adjacent sandy coast Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Yuta Mitobe, Nguyen Trung Viet

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　72　(2)　I_1663-I_1668　2018/09
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_1663 　

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 Phenomenon of accretion and erosion at the Darang River mouth has been observed to be severe for a long term. Based on Landsat images, the long-term evolution of this area from 1988 until now has been raised to discuss. Shoreline variation around the river mouth has happened in an unpredictable way; indeed, the areas adjacent to the river opening have much changeable while the areas far from the river mouth have been seen to have minor change. This study applies even-odd function method to analyze the variation of shoreline at the Darang River mouth. The formation of both sides of the river mouth varied consecutively in the period from 1988-2015.
Numerical simulation on tsunami mitigation by a shore-parallel canal in the Southern Sendai Coast Peer-reviewed

Kiyoshi Hashimoto, Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Investigation of mega-cusp formation causing coastal erosion in Vietnam Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Nguyen Trung Viet, Dov Zviely, Nguyen Van Luc, Dinh Van Duy, Tran Duc Huy

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Delta cuspate erosion in the Ombrone delta Peer-reviewed

Dinh Van Duy, Hitoshi Tanaka, Yuta Mitobe, Nguyen Xuan Tinh, Nguyen Trung Viet

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Bathymetry change associated with morphological recovery of beach severely damaged by the 2011 Tsunami Peer-reviewed

Jin Wang, Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Recovery of bathymetry in south Sendai Bay Coast after the 2011 Tsunami Peer-reviewed

Shintaro Saegusa, Hitoshi Tanaka, Yuta Mitobe

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Wave monitoring by UAV in northern Sendai Coast Peer-reviewed

Akihiro Suzuki, Yuta Mitobe, Hitoshi Tanaka

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Numerical study on tsunami-induced bottom shear stress Peer-reviewed

Yuki Kutsuzawa, Nguyen Xuan Tinh, Kazuya Watanabe, Hitoshi Tanaka

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Recent shoreline retreat on My Khe beach, Da Nang, Central Vietnam Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka, Nguyen Xuan Tinh, Dinh Van Duy, Nguyen Van Luc

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Two equation turbulence modeling of boundary layers under wave-current combined motion Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Numerical study on tsunami energy reduction by a canal along the Ishinomaki Coast Peer-reviewed

Kiyoshi Hashimoto, Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
WAM model to improve the prediction accuracy in long-term wave forecast Peer-reviewed

Tsuyoshi Kotoura, Hitoshi Tanaka

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Numerical simulation of wave boundary layers and characteristics of bed shear beneath tsunami wave Peer-reviewed

Song Wenzheng, Hitoshi Tanaka, Ahmad Sana

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Determination of the long-shore sediment transport along the beach from Cua Dai to Cua Lo estuary in Quang Nam, Vietnam Peer-reviewed

Nguyen Quang Duc Anh, Dinh Van Duy, Nguyen Xuan Tinh, Nguyen Trung Viet, Hitoshi Tanaka

Proceedings of 8th International Conference on Fluid Mechanics, (Sep. 25-28, 2018, Sendai, Japan)　2018/09
Effectiveness of a shore-parallel canal for reducing tsunami impact Peer-reviewed

Hitoshi Tanaka, Kiyoshi Hashimoto, Nguyen Xuantinh

Proceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018　1　11-17　2018/09/01
Sandy Beach Restoration Using Beach Nourishment Method: A Case Study of Nha Trang Beach, Vietnam Peer-reviewed

Mai T.T. Thuy, Tsuyoshi Nagasawa, Hitoshi Tanaka, Nguyen T. Viet

Journal of Coastal Research　81　(sp1)　57-66　2018/09

DOI： 10.2112/SI81-008.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Sand Spit Elongation and Sediment Balance at Cua Lo Inlet in Central Vietnam Peer-reviewed

Dinh V. Duy, Hitoshi Tanaka, Yuta Mitobe, Nguyen Q.D. Anh, Nguyen T. Viet

Journal of Coastal Research　81　(sp1)　32-39　2018/09

DOI： 10.2112/SI81-005.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Seasonal Variation of Morphology and Sediment Movement on Nha Trang Coast, Vietnam Peer-reviewed

Tran M. Thanh, Hitoshi Tanaka, Yuta Mitobe, Nguyen T. Viet, Rafael Almar

Journal of Coastal Research　81　(sp1)　22-31　2018/09

DOI： 10.2112/SI81-004.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Evolution of Nobiru coast at decadal to centennial scales including the 2011 tsunami impact Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Vo Cong Hoang

Proceedings of the Coastal Engineering Conference　36　(2018)　2018/07

ISSN： 0161-3782
Numerical study on tsunami waves ascending a river Peer-reviewed

Yuta Mitobe, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　74　(2)　I_228-I_233　2018/06
Elongation of sand spit at the Loc An River mouth, Southern Vietnam Peer-reviewed

Nguyen Quang Duc Anh, Dinh Van Duy, Hitoshi Tanaka, Nguyen Trung Viet

Journal of JSCE, Ser.B3 (Ocean Eng.)　74　(2)　I_695-I_700　2018/06
Application of ensemble meteorological forecasting for wave prediction to use in marine works Peer-reviewed

Tsuyoshi Kotoura, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　74　(2)　I_629-I_634　2018/06
Reduction effect of tsunami disaster by canals Peer-reviewed

Kiyoshi HASHIMOTO, Hitoshi TANAKA

Journal of JSCE, Ser.B3 (Ocean Eng.)　74　(2)　I_157-I_162　2018/06

DOI： 10.2208/jscejoe.74.I_157 　
Theory for Erosion Wave Propagation in Cua Dai Beach, Vietnam Peer-reviewed

Hitoshi Tanaka, Dinh Van Duy, Yuta Mitobe, Nguyen Trung Viet

Journal of Coastal Research　85　621-625　2018/05/01

DOI： 10.2112/SI85-125.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Estuarine morphology recovery after the 2011 Great East Japan earthquake tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Marine Geology　398　112-125　2018/04
Publisher: Elsevier B.V.
DOI： 10.1016/j.margeo.2018.01.001 　

ISSN： 0025-3227
The relationship between tsunami-induced bottom shear stress and coastal structure

沓澤佑樹, Tinh Nguyen Xuan, 渡辺一也, 田中仁

東北地域災害科学研究 = Tohoku journal of natural disaster science　54　1-6　2018/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Erosion mechanism of Ba Lang Beach located in Nha Trang, Central Vietnam

田中仁, Tinh Nguyen Xuan, Viet Nsuycn Trung, 三戸部佑太, Binh Nguyen Thai

東北地域災害科学研究 = Tohoku journal of natural disaster science　54　73-78　2018/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Laboratory experiment study on the building relative angle against tsunami waves

NGUYEN Xuan Tinh, MITOBE Yuta, TANAKA Hitoshi

東北地域災害科学研究　54　7‐12　2018/03
Sand spit elongation and sediment balance at the Cua Lo river moith, Central Vietnam Peer-reviewed

Hitoshi Tanaka, Dinh Van Duy, Yuta Mitobe, Nguyen Quang Duc Anh, Nguyen Trung Viet, Nguyen Ngoc The

Journal of JSCE, Ser.B1 (Hydr. Eng.)　74　(4)　I_475-I_480　2018/03
Numerical experiments on effect of river mouth morphology on tsunami behavior in rivers Peer-reviewed

Yuta Mitobe, Hitoshi Tanaka, Kazuya Watanabe, Neetu Tiwari, Yasunori Watanabe

COASTAL ENGINEERING JOURNAL　60　(4)　516-531　2018

DOI： 10.1080/21664250.2018.1531815 　

ISSN： 0578-5634

eISSN： 1793-6292
The Yamamoto coast over five years; The reconstruction of an embankment with tsunami-induced embayment Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe, Keiko Udo, Akira Mano

Advances in Natural and Technological Hazards Research　47　387-403　2018
Publisher: Springer Netherlands
DOI： 10.1007/978-3-319-58691-5_22 　

ISSN： 1878-9897

eISSN： 2213-6959
Channel sedimentation causing by grouping waves and wind waves at the Fishing Port, Japan Peer-reviewed

Takehito Horie, Takashi Kamo, Yasuji Nozaka, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
High-resolution tsunami-bedload coupled computation in AMR environment Peer-reviewed

Yasunori Watanabe, Yuta Mitobe, Hitoshi Tanaka, Kazuya Watanabe

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
Beach morphological changes on Sendai coast by Typhoon Lionrock Peer-reviewed

Yuta Mitobe, Hitoshi Tanaka, Akihiro Suzuki, Makoto Umeda, Daisuke Komori, Yoshiya Touge

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
A semi-analytic model of tidal inlets and their evolution Peer-reviewed

Magnus Larson, Almir Nunes, Hitoshi Tanaka, Hans Hanson

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
Numerical modeling of a turbulent bottom boundary layer under solitary waves on a smooth surface Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
Influence of beach length on the development of estuarine deltas Peer-reviewed

Duy Dinh Van, Hitoshi Tanaka, Magnus Larson, Yuta Mitobe, Viet Nguyen Trung

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
Analytical solution of beach profile response to sea level rise - Application for tectonic movement in Sendai, Japan Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Magnus Larson

Proceedings of the Coastal Engineering Conference　36　(2018)　2018

ISSN： 0161-3782
EXERIMENTAL STUDY ON FLOW STRUCTURE AND DEVELOPMENT OF BOUNDARY LAYER UNDER TURBULENT BORES Peer-reviewed

MITOBE Yuta, OCHIAI Jun, TANAKA Hitoshi, TINH Nguyen Xuan, AITA Shunsuke

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　74　(2)　I_55-I_60　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.74.I_55 　

ISSN： 1884-2399

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 In order to obtain further understanding on the temporal variation of bottom boundary layer and bed shear stress under tsunami waves, hydraulic experiments on flow structures and boundary layer development under turbulent bores were conducted. PTV was applied to obtain 2D vertical distribution of velocity. Initial water depth in the channel was set as 0, 1, 3, and 5 cm to investigate different flow motion and process of boundary layer development under the bores. While wave forms measured in the same conditions show good repeatability, 3D turbulent structure near the surface induced difference of the values and phases of velocity measured in the surface layer. Higher momentum and turbulence are gradually transported to lower layer under still water level. Shear velocity estimated from the vertical profile of the horizontal velocity has a peak after the arrival of the bores and this peak cannot be explained by the law of resistance under steady flow.
CHARACTERISTICS BOUNDARY LAYER AND BOTTOM SHEAR STRESS BENEATH TSUNAMI WAVES Peer-reviewed

TANAKA Hitoshi, TINH Nguyen Xuan, SONG Wenzheng

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　74　(2)　I_313-I_318　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.74.I_313 　

ISSN： 1884-2399

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 Using tsunami-induced velocity data measured at the mouth of Monterey Bay in US during the 2010 Chilean Earthquakes Tsunami, an investigation of bottom boundary layer characteristics beaneath tsunami was carried out. The observed velocity profile is highly similar to that in a wave boundary layer, rather than depth-limited velocity distribution as normally assumed under long waves. In order to distinguish a depth-limited boundary layer from wave boundary layer, theoretical criterion is obtained by using an empirical formula for wave boundary layer thickness, and the effectiveness of this criterion is examined for sea bottom boundary layer under shoaling hypothetical tsunami. It is found that the entire region of shoaling from tsunami source area with 4000m depth to shallow area with 10m depth is classified into wave friction zone. This result coincides with the measurement result in Monterey Bay. Furthermore, condition for the predominace of bottom frictiona term in shallow water equation is obtained from the ratio to local accerlations term, which is epressed in terms of two dimensionless parameters.
NUMERICAL STUDY OF TSUNAMI PROPAGATION USING A TURBULENCE MODEL Peer-reviewed

KUTSUZAWA Yuki, TINH Nguyen Xuan, WATANABE Kazuya, TANAKA Hitoshi

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　74　(2)　I_163-I_168　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.74.I_163 　

ISSN： 1884-2399

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 The 2011 Great Earthquake and Tsunami has caused huge morphological changes along the coastal areas in the Tohoku region. One of the key parameters causing these dramatical damages is the tsunami bottom shear stress acting on the sea bottom. In general, the tsunami wave is a longwave and the steady flow resistance method have been practically used in many tsunami numerical models to estimate the bottom shear stress by mean of using the depth-averaged velocity and friction coefficient (Method 1). However, the actual tsunami waves are unsteady flow conditions, so the application of Method 1 may inappropriate. Therefore, the EFDC vertical turbulent model is applied to take into account the effect of complex boundary layer development under unsteady tsunami condition (Method 2). In this study, these both methods are applied to calculate the tsunami bottom shear stress and compare between them. The shape of vertical velocity distribution results from the Method 2 are similar to the wave friction method. And bottom shear stresses by Method 2 are overall larger compared to the Method 1 under tsunami wave impacts.
SHORELINE CHANGE MODEL WITH SEASONALLY VARYING DEPTH OF CLOSURE -APPLICATION TO NHA TRANG BEACH- Peer-reviewed

THANH Tran Minh, TANAKA Hitoshi, VIET Nguyen Trung, TINH Nguyen Xuan

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　74　(2)　I_841-I_846　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.74.I_841 　

ISSN： 1884-2399

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 In recent years, beach erosion has become a big concern on the coast of Nha Trang in Vietnam. Seasonal beach erosion occurs in the north end of southern beach of Nha Trang affected to the beach attraction where is well-known for international and domestic tourists. A long-term video camera system have been deployed to investigate the shoreline changes in this area. The analysis of measured longterm measured shorelines have shown that the shoreline variations are strongly correlated to the seasonal monsoon regimes and the important of depth of closure variations. In this study, the authors are further numerically investigate the shoreline morphological changes with considering different values of closure depth which is depending on monsoon wave conditions, As a result, it is found that simulation shoreline position results show good agreement with measured values when using the seasonal closure depth variation. Such characteristics obtained in this study are considered to be commonly applicable to the coast of Vietnam where belongs to tropical monsoon climate region. These results are usful information for the coastal authority and manager for making better countermeasure plans against this kind of erosion mechanism.
BEACH MORPHOLOGICAL RESPONSE DUE TO LAND SUBSIDENCE AND RISING PROCESSES AFTER THE 2011 TOHOKU EARTHQUAKE Peer-reviewed

TINH Nguyen Xuan, TANAKA Hitoshi, LARSON Magnus

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　74　(2)　I_859-I_864　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.74.I_859 　

ISSN： 1884-2399

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 The 2011 Great Tohoku Earthquake caused a maximum of 1m land subsidence as measured in the Tohoku coastal regions. After that, the recovery of ground elevation is gradually occurring. This seabed level change is equivalent to the sea level rise process, so the data provide a unique opportunity to vertify Bruun's rule concept. In this study, new analytical solutions are developed based on the linear response theory to describe shoreline position change. Detailed, high-quality data sets obtained after the 2011 Tohoku Earthquake and Tsunami, including wave climate, beach profiles and bed level change due to tectonic movement were used to validate the model. As a result, the maximum shoreline retreat amount due to land recorvering by new method is in good agreement with the value estimated from the Bruun's rule. In addition, the obtained time constant of the beach deformation under the sea water level rise was much larger than beach response by the storm condition.
RECENT ACCELERATION IN SHORELINE RETREAT OF MY KHE BEACH, CENTRAL VIENAM Peer-reviewed

TANAKA Hitoshi, DUY Dinh Van, TINH Nguyen Xuan, VIET Nguyen Trung

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　74　(2)　I_701-I_706　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.74.I_701 　

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 My Khe Beach is located in Da Nang, the biggest city in Central Vietnam. Coastal erosion occurred in December 2017 has damaged many infrastructures located along this beach. Since there is no well-documented case study about coastal erosion in this area, Google earth images since 2002 were utilized to investigate the deformation of the My Khe Beach. The analysis results indicate that formations of megacusps in this beach were noticeable in the northeast monsoon season and it is clear that beach erosions occurred at the embayments of the megacusps. In addition, these megacusps were smoothed by the calm waves in the southwest monsoon season a few months later. The megacusps observed along the My Khe Beach have the alongshore spacing from 100 m to 300 m and the maximum cross-shore amplitude of 45 m. The local beach resorts have been developed without paying attention to this seasonal fluctuation of the beach. It is necessary to consider the characteristics of shoreline fluctuation clarified in this study for coastal planning and management.
STUDY ON EROSION MECHANISM OF BA LANG BEACH, CENTRAL VIETNAM Peer-reviewed

TANAKA Hitoshi, BINH Nguyen Thai, TINH Nguyen Xuan, MITOBE Yuta, VIET Nguyen Trung

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　74　(2)　I_689-I_694　2018
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.74.I_689 　

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 Nha Trang is a coastal city and capital of Khanh Hoa Province, on the South Central Coast of Vietnam. The city is on the beautiful Nha Trang Bay, which was chosen in two succeeding years as one of 29 most beautiful bays in the world. It has a long nice sandy beach in the south of Cai River and well known for international and domestic tourists. However, in the northern part of Cai River named as Ba Lang Beach is rather narrowed sandy beach. In addition, there a new reclamation road to the sea was built in the year of 2002 which had changed the shoreline from a concave shape to a straight-line shape of the shoreline. Because of this, serious beach erosion has occurred afterwards, the sandy beach has disappeared at some location on the beach. The objective of this study is to investigate the impact of this artificial bathymetry changes to the wave deformations then causing the beach erosion. The results are clearly indicated that after the road construction, the wave direction is more oblique to the shoreline direction compare to the previous condition. These results are also suggested that in order to recover the sandy beach in this area, the shape of shoreline position has to have a similar concave shape as previous shoreline position.
Analysis of shoreline change in Cua Dai beach by using Empirical Orthogonal Function Peer-reviewed

Tsuyoshi Nagasawa, Mai Thi Thu Thuy, Nguyen Trung Viet, Hitoshi Tanaka

COASTAL ENGINEERING JOURNAL　60　(4)　548-565　2018

DOI： 10.1080/21664250.2018.1554202 　

ISSN： 0578-5634

eISSN： 1793-6292
Estuarine hydrodynamics and morphodynamics: a perspective Peer-reviewed

Hitoshi Tanaka, Hubert Chanson

COASTAL ENGINEERING JOURNAL　60　(4)　385-386　2018

DOI： 10.1080/21664250.2018.1563323 　

ISSN： 0578-5634

eISSN： 1793-6292
Impact of road construction on sandy beach deformation on Ba Lang Beach, northern Nha Trang Bay, Vietnam

Hitoshi Tanaka, Nguyen Xuan Tinh, Nguyen Trung Viet

Proceedings of Symposium on Hydro-environmen Reasearch for Smart Cities (Hong Kong, Dec. 12-14, 2017)　2017/12
Occurence factors for channel sedimentation at a fishing port in Hokkaido, Japan Peer-reviewed

Takehito HORIE, Koji HASHIMOTO, Tomoaki SANO, Yuta OBATA, Yasuji NOZAKA, Hitoshi TANAKA

Journal of JSCE, Ser.B2 (Coastal Eng.)　73　(2)　I_631-I_636　2017/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.73.I_631 　

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 Hokkaido has a lot of fishing ports and the number of the fishing ports is about 280. Most of fishing ports in Hokkaido are located in the surf zone on the sandy beach. As a result, channel sedimentation has become a serious problem in many fishing ports. For example, a maintenance cost has been increasing every year. In general, when planning a coastal structure to control sediment movement, annual maximum wave heights was used as the external forces condition. However, channel sedimentation occurred in many fishing ports. Therefore, to understand channel sedimentation, in the autumn, wave, current, bed level change measurements were conducted at 4 observation points around Kuroiwa fishing port. From the results, We propose that not only wind waves height and period but also grouping waves (or long period waves) are important for channel sedimentation at fishing port. The point worth noting here is that during the grouping waves (or long period waves) developing, sand sedimentation had continued.
High-frequency beach monitoring with UAV photogrammetry Peer-reviewed

Akihiro Suzuki, Yuta Mitobe, Hitoshi Tanaka, Volker Roeber

Journal of JSCE, Ser.B2 (Coastal Eng.)　73　(2)　I_661-I_666　2017/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.73.I_661 　

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 Recently, due to the development of 3D photogrammetry and UAVs, the UAV photogrammetry has been widely applied to various fields of study including coastal engineering field. The UAV photogrammetry has some important advantages for beach monitoring to enable us to frequently and easily observe morphology of beaches and also nearshore wave propagation. In this study, morphological changes on the beach around the Nanakita River mouth were observed with one week frequency of UAV flights. A conventional method of shoreline analysis was firstly applied to see the short-term recovery of shoreline positions after a big typhoon event in 2016. And also the effect of a tsunami event in November 2016 on beach morphological changes around the river mouth was discussed through the shoreline change analysis and 3D shape analysis. More than ten meters of shoreline change often occurred during this period. The surface of the right sand spit was eroded by the tsunami and the jetty had an effect of interrupting sediment movement.
Local scour behind coastal embankment due to tsunami Peer-reviewed

Yuto Kaneko, Yuta Mitobe, Hitoshi Tanaka, Shunsuke Aita, Daisuke Komori

Journal of JSCE, Ser.B2 (Coastal Eng.)　73　(2)　I_871-I_876　2017/11

DOI： 10.2208/kaigan.72.I_913 　

ISSN： 1883-8944
Recovery process bathymetry of Sendai Bay after the 2011 Tsunami Peer-reviewed

Shintaro Saegusa, Hitoshi Taaka, Yuta Mitobe

Journal of JSCE, Ser.B2 (Coastal Eng.)　73　(2)　I_817-I_822　2017/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.73.I_817 　

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 The 2011 Tohoku Earthquake Tsunami caused serious and devastating morphology changes along Southern Sendai Bay Coast in Miyagi Prefecture, Japan. There are some places in which there still exists tsunami affected topography change even after more than six years since the 2011 Tsunami. Although there have been several investigations dealing with topographical recovery in this region, no study has been made covering whole of the littoral system on Southern Sendai Bay Coast. This study investigates whole of the region of Southern Sendai Bay Coast with the length of 50km to find overall behavior of sand coast recovery. Serious erosion has been observed off Idoura Lagoon and in front of the Abukuma river mouth in order to supply sediment to the adjacent tsunami-induced erosion area.
Asymmetric shoreline change around the Cua Dai River Mouth in Central Vietnam Peer-reviewed

Dinh Van Duy, Hitoshi Tanaka, Yuta Mitobe, Nguyen Trung Viet

Journal of JSCE, Ser.B2 (Coastal Eng.)　73　(2)　I_1579-I_1584　2017/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.73.I_1579 　

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 Recent erosion on the Cua Dai Coast located on the left bank of the Thu Bon River estuary in Central Vietnam is remarkable. On the other hand, erosion can not be seen on the right bank of the estuary. In order to grasp such asymmetric erosion situation, the characteristics of the topography change were clarified from the Google Earth image and the field survey result. Furthermore, in order to quantify the difference of long-term shoreline change, the coastline position was extracted from Landsat images. The results confirmed the erosion tendency on the left bank and deposition tendency on the right bank. Moreover, by using even-odd analysis, we showed that asymmetric shoreline variation is dominant across estuary opening. Furthermore, the shape of the estuary terrace can be estimated from the position of the breaking wave of the satellite image, and in recent years, the Cua Dai estuary front terrace is biased to the right bank side. It was concluded that the asymmetry of the sand returning from the estuary terrace brings about the asymmetric shoreline variation from now on.
A method for correcting tidal effect on shoreline position extracted from an image with unknown capture time Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Geosciences (Switzerland)　7　(3)　1-9　2017/09
Publisher: MDPI AG
DOI： 10.3390/geosciences7030062 　

ISSN： 2076-3263

eISSN： 2076-3263
Evaluation of longshore sediment transport rate along the Thu Bon River delta coastline in Vietnam Peer-reviewed

Hitoshi Tanaka, Dinh Van Duy, Nguyen Trung Viet

Proceedings of the 37th IAHR World Congress (Aug 13-18, Kuala Lumpur, Malaysia)　2017/08
Influence of calculation area on wave prediction for marine works in the Pacific Ocean Peer-reviewed

Tsuyoshi Kotoura, Hitoshi Tanaka

Proceedings of Coastal Dynamics 2017 (June, 12-16, 2017, Helsingør, Denmark)　1628-1637　2017/07
Characteristics of periodical shoreline change on Nha Trang Coast, Vietnam Peer-reviewed

Hitoshi Tanaka, Nguyen Trung Viet, Tran Minh Thanh, Le Thanh Binh

Journal of JSCE, Ser.B3 (Ocean Eng.)　73　(2)　I_522-I_527　2017/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.73.I_522 　

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 On Nha Trang Coast in South Central Vietnam, the retreat of shoreline has become obvious in recent years. However, investigations discussing the coastal erosion mechanism in this area are insufficient. Therefore, a video camera system was installed in this area and started monitoring the shoreline change continuously from May 2013. Based on the camera's image data of over 3 years until August 2016, this study investigated the characteristics of beach deformation on the Nha Trang Coast. According to the video monitoring, the shoreline retreats in winter when the northeast monsoon waves are prevailing, and the beach is recovered in the summer due to calm waves from east or southeast. Then EOF (Empirical Orthogonal Function) analysis was utilized to decompress the dominant processes of shoreline variation along Nha Trang Coast, and found that the first component, which accounts for 93.8% of contribution rate, corresponds to seasonal shoreline change. Moreover, in order to confirm the periodical characteristics of shoreline change, this study approximated spatial and temporal eigenfunctions by using simple linear regression and Fourier series expansion, respectively. It was also found that the seasonal shoreline variation was observed within 350 m of the northern end of this coast.
Influence of sandy beach length on development process of estuarine delta Peer-reviewed

Hitoshi Tanaka, Dinh Van Duy, Yuta Mitobe, Nguyen Trung Viet

Journal of JSCE, Ser.B3 (Ocean Eng.)　73　(2)　I_516-I_521　2017/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.73.I_516 　

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 In recent years, severe coastal erosion in river mouth delta has been observed worldwide. To discuss such development of river mouth delta and shoreline retreat, an analytical solution of a one-line model, which is based on linearlized diffusion equation, may be used. By superimposing the solutions, it is possible to study various conditions and useful for understanding the essential phenomenon. However, the existing analytical solution for development of river mouth delta is restricted for rivers pour into an infinite length of the sandy beach. For this reason, it is impossible to take into consideration the influence of the edge of the beach such as capes and coastal structures. In this research, therefore, a theoretical study on a river mouth delta, which develops in a finite length sandy beach, has been investigated. It is found that the influence of the boundary does not appear when the dimensionless time t^* is less than 0.3, and the existing solution can be applied. When the dimensionless time is sufficiently large, it shows a simple delta development process in which the parabolic shaped shoreline moves in parallel. At this time, the longshore sediment transport rate decreases linearly from the river mouth to the boundary. This theory was verified using laboratory experimental data from Refaat (1990).
Investigation on improvement of accuracy of WAM prediction under mild wave climate Peer-reviewed

Tsuyoshi Kotoura, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　73　(2)　I_971-I_976　2017/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.73.I_971 　

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 Third generation wave estimation models such as WAM and SWAN are used in practical operations such as wave designing and daily wave prediction. The study on the workability judgment of marine construction through WAM has been conducted and the authors have confirmed that there are cases in which during low wave season, the overestimation of wave height and underestimation of wave period were observed. It is attributable to the factor that energy is overestimated in high frequency region.  In order to improve the overestimation of energy on the high frequency region, we focused on the dissipation term of the energy source term and examined energy dissipation on the high frequency region. Although there are cases in which the wave height is underestimated during the high waves, it is confirmed that the accuracy of estimation can be improved at low waves. As a result, the accuracy of workability judgment of marine construction work made using WAM was improved.
Evolution of river mouth delta -responses to variable river sediment discharge and to shifting river mouth opening- Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Dinh Van Duy, Yuta Mitobe, Nguyen Trung Viet

Journal of JSCE, Ser.A2 (Applied Mech.)　74　(1)　I_545-I_552　2017/06
Morphological change on Sendai Coast by Typhoon No.10, 2016 Peer-reviewed

Yuta Mitobe, Hitoshi Tanaka, Akihiro Suzuki, Makoto Umeda, Daisuke Komori, Yoshiya Touge

Journal of JSCE, Ser.B3 (Ocean Eng.)　73　(2)　I_552-I_557　2017/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.73.I_552 　

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 Impact of high tide and high waves due to typhoon No. 10, 2016 was discussed through field surveys under and after the typhoon event. From visual observation and debris carried in the event, maximum run-up height on Sendai Coast was estimated to be about T.P. 4 m. Severe erosion of embankment toe along the coast line near Sendai Port was observed. Due to overtopping of high waves over sand dune, some amount of sediment was transported into Gamo Lagoon.  20 ~ 30 m retreat of shoreline was observed through shoreline analysis based on aerial photographs taken before and after the typhoon. In one or two months after the event, shoreline positions almost reached to the positions before the typhoon mainly due to the contribution of the cross-shore sediment transport. However, the recovery was relatively slow in the area around Gamo Lagoon and Idoura Lagoon where the wave overtopping over the sand dunes were observed during the field survey. In addition to a river mouth and detached breakwaters, some structures revealed to coast line due to the erosion by the 2011 tsunami have effect to block the longshore sediment transport to induce faster recovery of the shore-line on the up-drift side of the longshore sediment transport.
Shoreline response to a sequence of typhoon and monsoon events Peer-reviewed

Rafael Almar, Patrick Marchesiello, Luis Pedro Almeida, Duong Hai Thuan, Hitoshi Tanaka, Nguyen Trung Viet

Water (Switzerland)　9　(6)　1-8　2017/05/23

DOI： 10.3390/w9060364 　

ISSN： 2073-4441

eISSN： 2073-4441
Asymmetric erosion of the Thu Bon River Delta, Central Vietnam Peer-reviewed

Hitoshi Tanaka, Dinh Van Duy, Nguyen Trung Viet

Abstract Proceedings of European Geosciences Union General Assembly (Vienna, Austria)　2017/04
平成 28 年台風 10 号による仙台海岸の地形変化 Peer-reviewed

三戸部佑太, 田中仁, 鈴木彰容, 梅田信, 小森大輔, 峠嘉哉

東北地域災害科学研究　53　211-216　2017/03
Study on recovery process of sand spit at the Abukuma River mouth after the 2011 Tsunami Peer-reviewed

Hitoshi Tanaka, Nguyen Trong Hiep, Yuta Mitobe, Shintaro Saegusa, Katsuhiko Sato

Journal of JSCE, Ser.B1 (Hydr. Eng.)　73　(4)　I_997-I_1002　2017/03
Publisher:
DOI： 10.2208/jscejhe.73.I_997 　

ISSN： 1880-8751
Characteristics of salt water movement in Iwaki River Estuary, Japan Peer-reviewed

Mikio Sasaki, Hitoshi Tanaka, Makoto Umeda

Journal of Earth Science and Engineering　7　(1)　10-19　2017/03

DOI： 10.17265/2159-581X/2017.01.002 　

ISSN： 2159-581X
Wave set-up height in river entrances due to extreme waves Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh

Procedia IUTAM　25　10-17　2017

DOI： 10.1016/j.piutam.2017.09.003 　

eISSN： 2210-9838
Accuracy verification and characterization of numerical simulation of tsunami run up into rivers Peer-reviewed

Yasuhisa Aoyama, Mohammad Bagus Adityawan, Yuta Mitobe, Daisuke Komori, Hitoshi Tanaka

Journal of Japan Society of Hydrology and Water Resources　30　(1)　345-355　2017/01

DOI： 10.3178/jjshwr.30.32 　

ISSN： 0915-1389
Coastal morphology change before and after 2011 off the pacific coast of Tohoku Earthquake Tsunami at Rikuzen-Takata Coast

Keiko Udo, Yuriko Takeda, Hitoshi Tanaka

Coastal Engineering Journal　58　(4)　2016/12/01

DOI： 10.1142/S0578563416400167 　

ISSN： 2166-4250

eISSN： 1793-6292
Experimental study on embankment reinforcement by steel sheet pile structure against Tsunami overflow Peer-reviewed

Yuta Mitobe, Mohammad Bagus Adityawan, Min Roh, Hitoshi Tanaka, Kazutaka Otsushi, Tatsuaki Kurosawa

Coastal Engineering Journal　58　(4)　2016/12/01

DOI： 10.1142/S0578563416400180 　

ISSN： 2166-4250

eISSN： 1793-6292
Tsunami Bores in Kitakami River Peer-reviewed

Elena Tolkova, Hitoshi Tanaka

Pure and Applied Geophysics　173　(12)　4039-4054　2016/12/01

DOI： 10.1007/s00024-016-1351-7 　

ISSN： 0033-4553

eISSN： 1420-9136
A new approach to numerical modeling of tsunami considering unsteady boundary layer develpment Invited Peer-reviewed

Hitoshi Tanaka, Yuta Mitobe, Neetu Tiwari, Kazuya Watanabe, Yasunori Watanabe

Proceedings of The 3rd International Conference on Coastal Zone Engineering and Management in the Middle East (Arabian Coast 2016) (Nov 20-23, Debai UAE) (Keynote lecture)　2016/11/22
Effect of seasonal waves on net longshore sediment transport, Nha Trang Coast, Vietnam Peer-reviewed

Tran Minh Thanh, Hitoshi Tanaka, Yuta Mitobe, Nguyen Trung Viet

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_547-I_552　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_547 　

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 Shoreline variation on Nha Trang Coast, Vietnam, is analyzed based on a set of continuous camera images which is obtained from two video-cameras monitoring. As a result, the retreat of shoreline appeared seasonally on this coast, especially strong northeast monsoon waves have caused the severe erosion. In addition, in order to understand more comprehensively the shoreline behavior, this study also analyzes the data of shoreline evolution by using Empirical Orthogonal Function (EOF). The results of EOF analysis indicate that the contribution of the first component is about 89% out of total, therefore the other components are negligible. Besides, temporal eigenfunction of the first component reflects the seasonal variation of morphology corresponding to seasonal longshore sediment transport in response to the changes of wave direction in each monsoon period. Following that, estimation of net longshore sediment transport rate is carried out based on depth of closure variation (D_c) in consideration of seasonal change of wave conditions. The differential response to the change of net longshore sediment transport rate, which is calculated from a constant D_c and seasonal values of D_c, is also clarified in this study.
Study on river mouth delta formation and recent beach erosion on Cua Dai Beach, Vietnam Peer-reviewed

Dinh Van Duy, Hitoshi Tanaka, Yuta Mitobe, Vo Cong Hoang, Nguyen Trung Viet

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_1657-I_1662　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_1657 　

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 An asymmetric distribution of sand supplied from the river at a river mouth delta has been discussed. The current erosion situation of Cua Dai Beach in central Vietnam was first introduced using Google Earth images. The evolution of the Thu Bon River delta coastlines were also analyzed using typical Landsat images from 1975 to 2014. It was observed that there were three periods in the formation process of Thu Bon River delta during the last 40 years with the symmetrical and asymmetrical configurations of the two coastlines. This evolution and its relation to the sediment supplied from Thu Bon River were then quantitatively investigated using analytical solution of one-line model.
Recovery of littoral system on Sendai Coast after the Great East Japan Earthquake Tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_769-I_774　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_769 　

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 It has been five years since the occurrence of the 2011 Great East Japan Earthquake and Tsunami. The recovery of littoral system on Sendai Coast, Miyagi Prefecture is further investigated in this study. By adding two more years of shoreline position data extracted from aerial photographs and utilizing the Empirical Orthogonal Function (EOF) analysis, the recovery of littoral system of the coast can be revealed. Results indicate that the shoreline has not been in equilibrium condition yet. Shoreline positions at the severe damage areas, especially in front of the Gamo and Idoura Lagoons, are still advanced, however the shoreline position at the detached breakwaters is retreated. The first three components of EOF analysis are same with the ones of the period three years after the tsunami. However, the contribution rates have changed, increasing for the first component and decreasing for these other two components. Shoreline change rates along the coast of the period five years after the tsunami change significantly compared to the period before the tsunami, and comparatively change compared to the period three years after the tsunami. As a result, the sediment budget has been also changed.
Shifting of Da Rang River mouth and its relationship with erosion on adjacent sandy coast Peer-reviewed

Nguyen Trong Hiep, Hitoshi Tanaka, Yuta Mitobe, Vo Cong Hoang, Tran Minh Thanh, Nguyen Trung Viet

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_1663-I_1668　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_1663 　

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 Phenomenon of accretion and erosion at the Darang River mouth has been observed to be severe for a long term. Based on Landsat images, the long-term evolution of this area from 1988 until now has been raised to discuss. Shoreline variation around the river mouth has happened in an unpredictable way; indeed, the areas adjacent to the river opening have much changeable while the areas far from the river mouth have been seen to have minor change. This study applies even-odd function method to analyze the variation of shoreline at the Darang River mouth. The formation of both sides of the river mouth varied consecutively in the period from 1988-2015.
AMR-CIP computational framework for tsunami run-up on high resolution topography Peer-reviewed

Yasunori Watanabe, Hitoshi Tanaka, Yuta Mitobe, Kazuya Watanabe

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_283-I_288　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_283 　

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 This paper presents the novel semi-Lagrangian computational model for estimating comprehensive tsunami run-up process on high resolution topographical data under Adaptive-Mesh-Refinement environment. The model was applied to the experimental and numerical flooding cases on Kitakami river for the 2011 Tohoku tsunami models. The computational and topographical resolutions significantly affect timings and locations occurring overflow over embankments and spreading velocity of the floods. The current model has advantages to precisely compute divergence of the bed load flux, resulting from local gradients of the bottom shear, leading to reasonable estimates of the local deposition and erosion.
Numerical experiment on water level change in river with different magnitude of tsunamis Peer-reviewed

Yuta Mitobe, Kazuya Watanabe, Hitoshi Tanaka, Neetu Tiwari, Yasunori Watanabe

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_259-I_264　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_271 　

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 In this study, a numerical experiment on water level change in river induced by tsunamis were conducted to discuss the mechanism of longer duration of high water level in rivers than the period of tsunami, which was observed in 2011 tsunami event. Wave conditions which has 5~100 % of wave heights of 2011 tsunami were made based on the simulated wave form of 2011 tsunami, and the characteristics of water level change with the different magnitude of tsunamis were tested through numerical simulation in Kitakami River. It is found that increase of tsunami height induce larger discharge across the river mouth for both of incoming and outgoing flow, while the increase rate is larger for incoming flow. And that results in the transition of the condition to keep higher water level in longer period with higher waves. This characteristics were observed for many simulated historical tsunami events. And tsunami period does not have significant effect to cause the difference on characteristics of the flow across the river mouth.
Experiment on velocity field in scouring and reduction effect behind coastal dikes by tsunami overflow Peer-reviewed

Yuto Kaneko, Yuta Mitobe, Kazutaka Otsushi, Tatsuaki Kurosawa, Hitoshi Tanaka, Daisuke Komori

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_913-I_918　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_913 　

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 Local scour behind coastal dikes by tsunami overflow is a main factor of their destruction by the 2011 tsunami. However, the local scour is also considered to have reduction effect on velocity of tsunami flood. In order to design optimum coastal dikes against tsunami, velocity reduction by the local scour is required to be quantitatively evaluated in addition to the toughness of coastal dikes against tsunami overflow.  In this study, characteristics of velocity field behind coastal dikes were discussed through hydraulic experiments with measurement of velocity field around local scour models by Particle Tracking Velocimetry (PTV). The models of the local scour were made of acrylic boards as fixed bed based on previous moveble bed experiments by authors. And the reduction effect by the scour hole were discussed through comparison of the landward velocity with and without the scour behind the coastal dike model.  Some different flow patterns were observed in the cases with different overflow depths and sizes of scour holes. With relatively larger scour hole, large vorteces and separation of the flow were observed in the scour, while flow was along the bed without no large horizontal vorteces and separation of the flow with the smaller scour. Reduction rate of the landward velocity by the scour hole was about 60 % with the former flow patterns, while it was less than 30% with the latter flow patterns.
Channel sedimentation causing by grouping waves and wind waves at a fisfery port in Funka Bay, Japan Peer-reviewed

Takehiro Horie, Yuta Obata, Koji Hashimoto, Yasuji Nozaka, Hitoshi Tanaka

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_631-I_636　2016/11/17
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_631 　

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 In this study, wave observation, currenet observation and bed level change observation were conducted around the Kuroiwa fishing port to reveal the channel sedimentation mechanism. From the results of bed level change observation, we find out that series of sand depressions and ascensions occurred for three times at the port entrance of Kuroiwa Fishing port during the observation. To reveal the process of channel sedimentation, we conducted wave-to-wave analysis, spectral analysis, EOF analysis, et al. From the results of these analyses, it is important to control sediment transport not only wind waves, but grouping waves attacked the Kuroiwa Fishing port.
Theoretical study on erosion at Cua Dai river delta coast induced by the reduction of sediment supply Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Nguyen Trung Viet

Proceedings of the 9th International Conference on Coastal and Port Engineering in Developing Countries – IX PIANC-COPEDEC, (October 16-21, 2016, Rio de Janeiro, Brazil)　2016/11/10
Numerical simulation of tsunami river runup by Simultaneous Coupling Method (SCM) Peer-reviewed

Yuta Mitobe, Neetu Tiwari, Kazuya Watanabe, Hitoshi Tanaka, Yasunori Watanabe

Journal of JSCE B2 (Coastal Eng)　B2-72　(2)　I_259-I_264　2016/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.72.I_259 　

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 In order to improve the accuracy of numerical simulation on morphological changes caused by tsunamis, Simultaneous Coupling Method (SCM), which couples 2 dimensional shallow water equation model and boundary layer equation model, was applied to numerical simulation of tsunami runup in Kitakami River. Under the front of the tsunami wave, steep peak of bed-shear stress was observed, while the variation of bed-shear stress was similar to the variation of bed-shear stress based on manning's law, which has been commonl applied for standard model for tsunami propagation.
Asymmetric delta formation at Cua Dai River mouth, Central Vietnam: implications for ecent erosion of adjacent sandy coast Peer-reviewed

Dinh Van Duy, Hitoshi Tanaka, Yuta Mitobe, Nguyen Trung Viet

Proceedings of THESIS 2016, Two-Phase Modelling for Sediment Dynamics in Geophysical Flows, Tokyo Japan, September 12‐14, 2016.　2016/09/12
Characteristics of heavy rainfall and flood inundation at Shibui River in Miyagi Prefecture in September 2015 Peer-reviewed

Shuichi Kure, Shuji Moriguchi, Takahiro Horiai, Daisuke Komori, So Kazama, Hitoshi Tanaka

Journal of Japan Society for Natural Disaster Science　35　(2)　87-103　2016/09

ISSN： 0286-6021
Numerical simulation of shallow water waves with bottom boundary layer development Invited Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Yuta Mitobe

Proceedings of the 3rd Internatinal Conference on Earthquake Engineering and Dimsaster Mitigation (3rd ICEEDM, Aug 1-2, 2016. Bali, Indonesia) (Keynote lecture)　69-74　2016/08/01
Long-term estuarine morphology change in Central Vietnam Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Nguyen Trung Viet

Proceedings of 35th International Conference on Coastal Engineering (17-22 July 2016, Antalya, Turkey)　2016/07
Backfilling at breaching on Yamamoto Coast after the 2011 Tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe, Keiko Udo, Akira Mano

Proceedings of 35th International Conference on Coastal Engineering (17-22 July 2016, Antalya, Turkey)　2016/07
Relationship between river morphology change and sand terrace formation at the Da Rang river moith, Vietnam Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Tran Minh Thanh, Nguyen Trong Hiep, Nguyen Trung Viet

Journal of JSCE, Ser.B3 (Ocean Eng.)　72　(2)　I_892-I_897　2016/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.72.I_892 　

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 In recent years, the erosion of shoreline at the Da Rang River mouth that is located in Tuy Hoa City in central Vietnam has become serious. This study presents changes of coastal morphology at this river mouth through the analysis of satellite images. Shoreline position in the area of about 9km in length around the river mouth was eroded severely, while it was stable on other adjacent areas. The erosion was most severe at the river mouth, whereas it was mild on the beaches far away from the river mouth. There are demarcations where the severe erosion did not propagate beyond. The roles of sand terrace as submerged sand source proving sediment to the adjacent shoreline is also discussed. The evolution of morphology at this river mouth is very important; hence accumulation of more field survey data and further study are highly required.
Shoreline changes in a wide area on both sides the Cua Dai river mouth, Vietnam Peer-reviewed

Dinh Van Duy, Hitishi Tanaka, Nguyen Trung Viet

Journal of JSCE, Ser.B3 (Ocean Eng.)　72　(2)　I_886-I_891　2016/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.72.I_886 　

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 Shoreline change rate has been used to discuss the distribution of sand input from the Thu Bon River. According to the rate of shoreline change, the asymmetric distribution of sediment input from the river at the Cua Dai River mouth, Vietnam has been revealed. Transporting of sediment to the north by wave-driven longshore currents together with asymmetric distribution of sand supplied from Thu Bon River has been causing severe erosion on the left beach of the Cua Dai River mouth. In the future, more detailed analysis will be carried out by accumulating wave data in order to quantify the mechanism of this asymmetric behavior of sediment and resulting morphology change around the Cua Dai River mouth.
Tidal correction method for shoreline position extracted from Google Earth images Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe, Dinh Van Duy

Journal of JSCE, Ser.B3 (Ocean Eng.)　72　(2)　I_61-I_66　2016/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.72.I_61 　

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 It is common to realize in literatures that shoreline position extracted from unknown capture time aerial photograph or satellite image (hereafter referring both kinds as image) has not been corrected to tidal effect. One of reasons is due to missing capture time of satellite image which was collected from open sources or captured a long time ago. However, the correction of tide for shoreline position extracted from image is highly required for studies in the field of coastal morphology changes. Especially, in the developing country, where field data is very limited, shoreline data extracted from satellite image plays more important role. There approaches, which can estimate the capture time of image based on the solar height and the length of shadow of vertical object on the horizontal surface on the earth, are introduced in this study. The capture time estimated from solar height has much smaller error compared to that from length of shadow. This error is acceptable for the tidal correction purpose. The temporal variation of shoreline positions of cases without and with tidal correction has been shown.
Study on seasonal variation of sediment movement on Nha Trang Coast, Vietnam Peer-reviewed

Tran Minh Thanh, Hitoshi Tanaka, Yuta Mitobe, Nguyen Trung Viet, Vo Cong Hoang

Journal of JSCE, Ser.B3 (Ocean Eng.)　72　(2)　I_67-I_72　2016/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.72.I_67 　

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 Each year, there have been many storms and strong monsoon waves that caused significant change of coastal morphology in the coastal zones of Vietnam. In the central of Vietnam, Nha Trang Coast also has a severe shoreline erosion problem, especially beach in the northern area of southern Nha Trang Bay disappears in several months every year. In this study, seasonal variation of morphology in this area is investigated. The detailed process of morphological change is presented based on analysis of fifteen-minute time-averaged images from northern and southern camera of video monitoring system. In addition, on the basis of the camera images analysis for surf zone characteristics, depth of closure is identified in consideration of different wave conditions between the northeast monsoon season and the non-monsoon season; hence the estimation of closure depth based on width of surf zone is also proposed in this analysis. Following that, longshore sediment transport rate for corresponded seasons is computed.
Examination of the factor of an WAM model accuracy reduction Peer-reviewed

Tsuyoshi Kotoura, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　72　(2)　I_271-I_276　2016/06

DOI： 10.2208/jscejoe.72.I_271 　
Waves, currents and channel sedimentation in Otoshibe Fishing Port Peer-reviewed

Takehito Horie, Yuta Obata, Kouji Hashimoto, Yasuji Nozaka, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　72　(2)　I_1006-I_1011　2016/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.72.I_1006 　

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 In this study, wave observation, current observation and bed level change observation were conducted around the Otoshibe fishing port to reveal the channel sedimentation mechanism. Followings were major accomplishments of this study. From the results of bed level change observation, we find out that sand ascension at channel of Otoshibe Fishing port occurred for Nov. 26 to Dec. 2 and we find out three big shoaling for observation period. To reveal that developmental process of sand at water way we are conducted spectral analysis and EOF analysis. From the results of spectral analysis when big shoaling occurred, the value of spectral width parameter was found to be low. Then we find out that this reason is because wave grouping attacked the Otoshibe Fishing port. From the results of EOF analysis when big shoaling occurred, the contribution ratio of the first EOF mode is high. From the above results, the reasons causing bed level changes are considered big waves by winds or heave waves. When these waves attack to the Otoshibe port, it is considered that the sands transported by the left current are deposited.
Evaluation of probable maximum hydrodynamic force of flood inundation at the Shibui River in September 2015 Peer-reviewed

Shuichi Kure, Akihiro Hayashi, Shuji Moriguchi, Takahiro Horiai, Hitoshi Tanaka

Advances in River Engineering　22　2016/06
Experimental study on bottom boundary layer beneath solitary wave Peer-reviewed

Bambang Winarta, Nadiatul Adilah Ahmad Abdul Ghani, Hitoshi Tanaka, Hiroto Yamaji, Mohammad Fadhli Ahmad

ARPN Journal of Engineering and Applied Sciences　11　(8)　5358-5364　2016/04

eISSN： 1819-6608
Interrelationship between serious shoreline retreat and sand terrace formation on Cua Dai Beach, Central Vietnam Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Nguyen Trung Viet, Dinh Van Duy

Journal of JSCE, Ser.B1 (Hydr. Eng.)　72　(4)　I_361-I_366　2016/03

DOI： 10.2208/jscejhe.72.I_361 　
Recovery of tsunami-induced concave shoreline bounded headlands Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe, Keiko Udo, Akira Mano

Journal of JSCE, Ser.B1 (Hydr. Eng.)　72　(4)　I_367-I_372　2016/03

DOI： 10.2208/jscejhe.72.I_367 　
Modeling of bivalve habitation in a shallow brackish lake Peer-reviewed

Makoto Umeda, Aki Nishimura, Atas Pracoyo, Hitoshi Tanaka, Mikio Sasaki

Journal of JSCE, Ser.B1 (Hydr. Eng.)　72　(4)　I_649-I_654　2016/03

DOI： 10.2208/jscejhe.72.I_649 　
Numerical study on tsunami propagation into a river Peer-reviewed

Yasuhisa Aoyama, Mohammad Bagus Adityawan, Wahyu Widiyanto, Yuta Mitobe, Daisuke Komori, Hitoshi Tanaka

Journal of Coastal Research　1　(75)　1017-1021　2016/03/01

DOI： 10.2112/SI75-204.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Prediction of the 2011 Tohoku Tsunami scouring near structures Peer-reviewed

Tatsuki Iida, Shuich Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

Journal of Coastal Research　1　(75)　872-876　2016/03/01

DOI： 10.2112/SI75-175.1 　

ISSN： 0749-0208

eISSN： 1551-5036
A new computation method of bottom shear stress under Tsunami waves Peer-reviewed

Hitoshi Tanaka, Mohammad B. Adityawan, Yuta Mitobe, Wahyu Widiyanto

Journal of Coastal Research　1　(75)　1247-1251　2016/03/01

DOI： 10.2112/SI75-250.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Study on mechanism of tsunami bay formation on Yamamoto Coast Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe, Keiko Udo, Akira Mano

Journal of Natural Disaster Science　34　(4)　309-317　2016/02
INVESTIGATION ON FACTORS AFFECTING ACCURACY OF WAM PREDICTION UNDER MILD WAVE CLIMATE

KOTOURA Tsuyoshi, TANAKA Hitoshi

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)　72　(2)　I_271-I_276　2016
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.72.I_271 　

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 For maritime constructions, it is highly important to obtain reliable wave predictions for safety operation and work executable judgment. Advanced wave prediction method based on WAM model has recently been utilized in many marine construction sites. However, accuracy of the wave prediction under mild wave climate is not clear. This study investigates accuracy reduction factors of the WAM model based on the comparison between hindcast calculation and field data, with special reference to low wave condition. From this comparison, it is found that spectra obtained from the WAM model gives overestimation at high frequency region (0.3-0.4Hz), which might be induced by overestimation of wave height and also by underestimation of wave period in this region. Thus model improvement is required for high-frequency waves in order to increase prediction accuracy for lower waves.
Bottom shear stress and bed load sediment transport due to irregular wave motion Peer-reviewed

Suntoyo, A. Harris Fattah, Muhammad Yunan Fahmi, Taufiqur Rachman, Hitoshi Tanaka

ARPN Journal of Engineering and Applied Sciences　11　(2)　825-829　2016

eISSN： 1819-6608
Experiment investigation of turbulence generated by solitary wave over smooth beds Peer-reviewed

Bambang Winarta, Nadiatul Adilah Ahmad Abdul Ghani, Hitoshi Tanaka, Hiroto Yamaji, Mohammad Fadhli Ahmad

ARPN Journal of Engineering and Applied Sciences　11　(4)　2211-2216　2016

eISSN： 1819-6608
Characteristics of shoreline retreat due to the 2011 Tohoku earthquake and Tsunami and its recovery after three years Peer-reviewed

Keiko Udo, Kaoru Tojo, Yuriko Takeda, Hitoshi Tanaka, Akira Mano

Coastal Research Library　14　113-123　2016

DOI： 10.1007/978-3-319-28528-3_8 　

ISSN： 2211-0577

eISSN： 2211-0585
Post-Tsunami lagoon morphology restoration Sendai; Japan Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Coastal Research Library　14　153-166　2016

DOI： 10.1007/978-3-319-28528-3_11 　

ISSN： 2211-0577

eISSN： 2211-0585
Investigation of morphological change at the cua dai river mouth through satellite image analysis Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Nguyen Trung Viet

Proceedings of the Coastal Engineering Conference　35　2016

ISSN： 0161-3782
Morphological characteristics of river mouths after the 2011 Tohoku Tsunami in Miyagi prefecture Peer-reviewed

Min Roh, Yuta Mitobe, Hitoshi Tanaka

Coastal Research Library　14　137-152　2016

DOI： 10.1007/978-3-319-28528-3_10 　

ISSN： 2211-0577

eISSN： 2211-0585
Investigating the 2011 Tsunami Impact on the Teizan Canal and the Old River Mouth in Sendai Coast. Miyagi Prefecture; Japan Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Coastal Research Library　14　125-136　2016

DOI： 10.1007/978-3-319-28528-3_9 　

ISSN： 2211-0577

eISSN： 2211-0585
山元海岸における津波湾の形成機構に関する研究 Peer-reviewed

V. C. Hoang, 田中仁, 三戸部佑太, 有働恵子, 真野明

自然災害科学　34　(4)　309-317　2016
Publisher:
ISSN： 0286-6021
Backfilling of sandy coast breaching after the 2011 Tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe, Keiko Udo, Akira Mano

Proceedings of the Coastal Engineering Conference　35　2016

ISSN： 0161-3782
河川遡上津波の数値計算精度に堤防越流が与える影響 Peer-reviewed

青山恭尚, 三戸部佑太, 小森大輔, 田中仁

東北地域災害科学研究　52　205-210　2016
津波越流による堤防法尻における流れ場の分類に関する水理実験 Peer-reviewed

金子祐人, 三戸部佑太, 乙志和孝, 黒澤辰昭, 小森大輔, 田中仁

東北地域災害科学研究　52　175-180　2016
Storm surge protection by tsunami seawalls in Sendai, Japan Peer-reviewed

Jeremy D. Bricker, Volker Roeber, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　35　2016

ISSN： 0161-3782
Impact of the 2011 tsunami on the littoral system around offshore breakwaters on Sendai Coast Peer-reviewed

H. Tanaka, Y. Mitobe, A. Mori

Scour and Erosion - Proceedings of the 8th International Conference on Scour and Erosion, ICSE 2016　349-353　2016

DOI： 10.1201/9781315375045-42 　
Evaluation of longshore sediment transport on Nha Trang Coast considering influence of northeast monsoon waves Peer-reviewed

Tran Minh Thanh, Hitoshi Tanaka, Nguyen Trung Viet, Yuta Mitobe, Vo Cong Honag

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-71　(2)　I_1681-I_1686　2015/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.71.I_1681 　

ISSN： 1884-2399

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On Nha Trang Coast, in southern of Vietnam, investigation of shoreline change using video-camera technique has been carried out over the period of about one and a half year. Thus, data of shoreline change was obtained two times for the northeast monsoon period and two times for the non-monsoon period. Images on plane coordinate system, which are projected from oblique images of the video-camera system, are utilized to evaluate shoreline variation. During the northeast monsoon period, longshore sediment transport from north to south is dominant; as a result, that causes erosion of sandy beach in the north end area of Nha Trang Coast. Recovery process of shoreline in this area is observed in the nonmonsoon period. In addition, the variation of shoreline is analyzed to obtain longshore sediment transport rate. Characteristics of waves are greatly different between the northeast monsoon period and the nonmonsoon period; hence, it is necessary to change value of depth of closure (D_C) for corresponded season. This study determined seasonal variation of depth of closure as well as an ordinary method to obtain a constant value of depth of closure has been also utilized; the difference is clarified.
Study on Naruse River mouth morphology change and its recovery process after the 2011 Tohoku Tsunami Peer-reviewed

Min Roh, Hitoshi Tanaka, Yuta Mitobe

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-71　(2)　I_655-I_660　2015/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.71.I_655 　

ISSN： 1884-2399

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A morphology in coastlines and estuarine has been changed over the 4 years after the 2011 Tohoku Tsunami. Sand river mouths showed severe changes morphologically. After the tsunami event, river mouth areas are in a recovery and reformation process that depends on the sediment supply into the river mouth. In this study, the recovery process and morphological changes of the Naruse River mouth were investigated by using aerial photographs and river mouth cross-sectional data on pre- and post-tsunami. Furthermore, the variation of the estimated cross-sectional areas near the river mouth was used to verify the relationship with tidal prism. It was found that the sediment supply into the river mouth is one of the important factors in determining the characteristics of the river mouth morphological changes and recovery process.
Analysis of the geomorphic change around the structure due to the tsunami Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-71　(2)　I_1105-I_1110　2015/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.71.I_1105 　

ISSN： 1884-2399

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The Geomorphic change due to the overflow of the tsunami have the great impact to the stability of the coastal structure and washout the beach which is excel in the aspects of both the environment and the usage for recreation. Even in these days, over the half swimming beach could not start again because of the erosion due to the tsunami in the disaster area. In this study, the effects of the geomorphic change due to the overflowing tsunami on the stability of the structures were estimated by using the two-dimensional numerical wave flume coupled with the analysis model of the geomorphic change. In the result, it is thought that the erosion due to both the rushing and receding wave cause the instability of the revetment and then the revetment was destroyed when the tsunami rush back to the sea in the end. Moreover, the survey data and the results of the numerical simulations suggested the possibility of the washout to the offshore areas of the eroded sand due to the tsunami.
Numerical study for sediment transport due to tsunami around the Kitakami River mouth Peer-reviewed

Kentaro Imai, Daisuke Sugawara, Tomoyuki Takahashi, Shunji Iwama, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-71　(2)　I_247-I_252　2015/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.71.I_247 　

ISSN： 1884-2399

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A large-scale topographical variation occurred in Kitakami river mouth due to the 2011 Tohoku-oki earthquake tsunami. Land use is often developed in river mouth areas in Japan. As a variation by tsunami can be a factor of impediment to post-disaster recovery and reconstruction, it is important to clarify the process of a topographical change by tsunami in river mouth area. In this research, numerical simulations for tsunami sediment transport were carried out in Kitakami river mouth and the numerical results explain that 1) the erosion of the sandbar near the river mouth was proceeded by tsunami run up, 2) sediment was deposited in rice field of upper stream, and 3) sediment transport close to offing of the river mouth was caused by tsunami back wash.
Effect of hypoxic water and water temperature on fish in Tokyo Bay, Japan Peer-reviewed

Takehito Horie, Tomonari Okada, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-71　(2)　I_1369-I_1374　2015/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.71.I_1369 　

ISSN： 1884-2399

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The objective of this study is to reveal the relationship between seasonal or daily variations of water environment and the total mass of fish living in Tokyo bay. We show analysis results of "Sillago japonica" which live during summer in Tokyo Bay and "Hexagrammos" which live during winter in Tokyo bay, and both of them are demersal fish species. Hypoxic water (dissolved oxygen concentration below 3.0 mgl-1) occurred not only at the bottom layer, but well up into the middle layer after a high south wind. When hypoxic water was begun to attenuate, the catch of "Sillago japonica" per angler increased. That is, fish living in Tokyo bay responded to the daily variation of the life cycle (development and attenuation) of hypoxic water. On the other hand, long term trends between offshore sea area of the Pacific coast of Tokyo metro surface water temperature (SST) in summer and the total amount of catch (TAC) of "Sillago japonica" per year showed a clear correlation. Additionally, those between SST in winter and TAC of "Hexagrammos" showed a clear inverse correlation. That is, it was conceivable that the seasonal variation of TAC of fish living in Tokyo bay related to seasonal variation of Aleutian low pressure system of the north Pacific.
Scouring mechanism around structure by return flow of tsunami considering liquefaction Peer-reviewed

Tatsuki Iida, Shuichi Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-71　(2)　I_241-I_246　2015/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.71.I_241 　

ISSN： 1884-2399

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The 2011 Tohoku Tsunami left many spots of deep and wide scouring near coastal structures such as levees, tidal gates, buildings, etc. The scouring caused major damage to the structures. There are two known scouring mechanisms; erosion by bottom shear stress and liquefaction by pore-pressure. The former is established; however, the latter has not been quantified. We advanced a quasi-3D numerical model by a finite volume method to simulate the flow and sediment transport. Temporal and spatial porepressure calculation under the ground was newly developed to find liquefaction. We applied the model to the breached spot of the coastal levee at Fujituka on the Sendai Bay Coast where the levees with gaps were assumed as the initial condition. We found the depth of liquefaction reached 28% of the maximum erosion depth by the bottom shear stress. We concluded that although erosion by the shear stress is the major process, liquefaction by the pore-pressure is also significant.
Estuary choking in Lake Tofutsu, Japan Peer-reviewed

Takehito Horie, Hitoshi Tanaka

Proceedings of 8th International Conference on Asian Pacific Coasts (APAC2015) (USB)　2015/09
Morphology change analysis through video monitoring on Nha Trang Coast, Vietnam Peer-reviewed

Yuta Mitobe, Tran Minh Thanh, Vo Cong Hoang, Nguyen Trung Viet, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　B3-71　2015/06

DOI： 10.2208/jscejoe.71.I_413 　
Erosion mechanism of Cua Dai Beach, Central Vietnam Peer-reviewed

Hitoshi Tanaka, Nguyen Trung Viet, Vo Cong Hoang, Duy Dinh Van

Journal of JSCE, Ser.B3 (Ocean Eng.)　B3-71　2015/06

DOI： 10.2208/jscejoe.71.I_449 　
Theory for backfilling of tsunami-induced beach erosion Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Journal of JSCE, Ser.B3 (Ocean Eng.)　B3-71　2015/06

DOI： 10.2208/jscejoe.71.I_635 　
Environmental variation of sediment transport due to tsunami around detached breakwaters Peer-reviewed

Fumiaki Mori, Yuta Mitobe, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　B3-71　2015/06
Effect of submerged breakwaters on coastal morphology change due to tsunami Peer-reviewed

Keiko Udo, Yuriko Takeda, Hitoshi Tanaka, Akira Mano

Journal of JSCE, Ser.B3 (Ocean Eng.)　B3-71　2015/06
Recovery process of the Natori River mouth morphology after the 2011 Tohoku Tsunami Peer-reviewed

Min Roh, Hitoshi Tanaka, Yuta Mitobe

Proceedings of International Conference on Coastal Sediments (CS2015)　1-12　2015/05
Experiments on embankment reinforcement using steel piles against tsunami overflow, Peer-reviewed

Yuta Mitobe, Mohammad Bagus Adityawan, Hitoshi Tanaka, Toshiya Kawahara, Tatsuaki Kurosawa, Kazutaka Otsushi

Proceedings of International Conference on Coastal Sediments (CS2015)　1-6　2015/05
Characteristics of soilcrete created at the field using the NSV technology to reinforce earth levees in Dong Thap province, Vietnam Peer-reviewed

Hoang-Hung Tran-Nguyen, Long Phi Le, Bao Khac Le, Masaki Kitazume, Hitoshi Tanaka, Toru Kobayashi, Khang Thien Truong

Proceedings of International Conference on Innovations in Construction (CIGOS - PARIS 2015), ÉNS Cachan, France, May 11-12,　1-10　2015/05
Recovery of concave shoreline induced by the 2011 Tohoku Tsunami Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Yuta Mitobe

Proceedings of 22nd Canadian Hydrotechnical Conference, CSCE　2015/04
Theoretical study on the recovery process of estuary adjacent to the concave landform after the tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Journal of JSCE, Ser.B1 (Hydr. Eng.)　71　(4)　I_31-I_36　2015/03
Publisher:
DOI： 10.2208/jscejhe.71.I_31 　

ISSN： 1880-8751
泥火山噴出物流入後のポロン川下流部地形変化

田中仁, 森文章, 梅田信, 呉修一, 三戸部佑太

東北地域災害科学研究　51　171-176　2015
Publisher:
泥火山の噴火がインドネシア・ポロン川および周辺に与えた影響

呉修一, 梅田信, 田中仁, 有働恵子, 真野明,Suntoyo

東北地域災害科学研究　51　177-182　2015
Publisher:
Tsunami Observations in Rivers from a Perspective of Tsunami Interaction with Tide and Riverine Flow Peer-reviewed

Elena Tolkova, Hitoshi Tanaka, Min Roh

Pure and Applied Geophysics　172　(3-4)　953-968　2015

DOI： 10.1007/s00024-014-1017-2 　

ISSN： 0033-4553

eISSN： 1420-9136
Analytical Model for Concave Shoreline Induced by the 2011 Tsunami Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Yuta Mitobe

Procedia Engineering　126　214-217　2015

DOI： 10.1016/j.proeng.2015.11.223 　

ISSN： 1877-7058

eISSN： 1877-7058
MORPHOLOGICAL EVOLUTION OF BEACH ADJACENT TO THE RIVER MOUTH AFTER THE 2011 TSUNAMI Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS　4379-4385　2015
SPATIAL-TEMPORAL FLUCTUATION OF SALINITY IN LAKE JUSAN Peer-reviewed

Mikio Sasaki, Hitoshi Tanaka, Makoto Umda

PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS　827-837　2015
On the shoreline and river mouth morphology changes around Samegawa River following the Great East Japan Tsunami of 2011 Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Hisao Nagabayashi

Journal of Environmental Fluid Mechanics　2014/12
Study on seasonal erosion of Nha Trang Coast in Vietnam Peer-reviewed

Nguyen Trung Viet, Nguyen Viet Duc, Vo Cong Hoang, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_1456-I_1460　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_1456 　

ISSN： 1884-2399

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The erosion on a part of the 4.3km long sandy beach on the right side of Cai river mouth in Nha Trang Bay, Vietnam, which is widely considered as among the world's most beautiful bays, has been observed. This study investigates the mechanism of the shoreline variation based on the analysis of the aerial photographs which cover a long time period. The effect of the hotel which playing the function similar to a jetty in the coastal area has been discussed. The analysis also points out that the variation of the shoreline clearly related to the seasonal variation of wave. The erosion occurs from autumn to winter in every years with the dominant of the northeast monsoon. While, in the remaining periods shoreline is advance. Images from real-time monitoring cameras clearly show the variation process of shoreline from season to season,
An estimation of land subsidence due to the 2011 Earthquake using measured water level data Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Herry Yeh

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_216-I_220　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_216 　

ISSN： 1884-2399

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This study investigates the land subsidence in Miyagi Coast caused by The Great East Japan Earthquake of 2011 by analyzing water level measurement and tidal data. The continuous water level measurement data at Kobama, Nobiru, Onagawa, and Fukuchi were compared to the tidal level. It was found that before the earthquake, the recorded water level coincide well with the tidal level. The land subsidence caused vertical dislocation of the water level measurement device. Therefore,the measured water level elevation deviates from the astronomical tide. The land subsidence at each location was estimated based on this deviation. The estimated subsidence from the water level analysis at each location correlates well with the reported subsidence by the Geospatial Authority of Japan (GSI).
Shoreline retreat due to sink effect in the vicinity to a rivermouth scoured by the 2011 Tsunami Peer-reviewed

Vo Cong Hoang, Hitoshi Tanaka, Yuta Mitobe

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_506-I_510　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_506 　

ISSN： 1884-2399

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The Great East Japan Tsunami in March, 2011 caused the significant changes of morphology on Sendai Coast. The flushing of sand spit in front of Nanakita River mouth and the breaching at Akaiko area can be observed. This study investigates the erosion of shoreline on the right side of Nanakita River mouth and the recovery of the breaching after the tsunami. Estimation of diffusion coefficient, which is an important parameter in numerical simulation of shoreline change, has been carried out for both study areas from measured data of erosional area propagation. These values of diffusion coefficient have been used to reproduce the erosion and the recovery of shoreline positions at study areas. The results show good agreement between the analytical result and measurement.
Modification of littoral system due to the 2011 Tsunami Peer-reviewed

Vo Cong Hoang, Yuta Mitobe, Hitoshi Tanaka, Nguyen Trung Viet

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_521-I_525　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_521 　

ISSN： 1884-2399

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Recovery of sandy beach from severe erosion by the 2011 tsunami can be observed on Sendai Coast even 3 years after the tsunami. The long-term effect of such a severe morphology change on sediment transport system is investigated through analysis of aerial photographs. Empirical Orthogonal Function (EOF) analysis is applied to shoreline positions extracted from the aerial photographs. The first and third modes express the recovery process of shoreline from the severe erosion with respective time-scale, and the superposition of their contribution rate is more than 70%. Comparison of shoreline change rate before and after the tsunami clearly shows that the recovery process of severely eroded area caused completely different trend of sediment transport processes.
Morphologocal changes and recovery process at the Natori River mouth after the 2011 Tohoku Tsunami Peer-reviewed

Min Roh, Yuta Mitobe, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_511-I_515　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_511 　

ISSN： 1884-2399

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Morphological changes and recovery process at the Natori River mouth were evaluated by using the aerial photography and the observed cross-sectional data. The river mouth morphology has changed completely due to the 2011 Tohoku Tsunami. Since then, there is in the process of recovery. The result of the analysis shows that the morphological changes of the river mouth become stable condition. Furthermore, the relationship between tidal prism and inlet cross-sectional area was used to determine the current state of the Natori River mouth. It indicates that the river mouth condition has been returned to the past state before the 2011 Tohoku Tsunami. This study presents the influences of the river mouth structure in analyzing morphological changes and recovery process. It is also considered the practical problems in this area.
Effects of embankment reinforcement with steel sheet piles against tsunami overflow Peer-reviewed

Yuta Mitobe, Kazutaka Otsushi, Tatsuaki Kurosawa, Mohammad Bagus Adityawan, Min Roh, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_976-I_980　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_976 　

ISSN： 1884-2399

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Embankment reinforcement with steel sheet piles is presented as a countermeasure against tsunami overflow, which is known as a main cause of failures of coastal embankments due to the 2011 tsunami. In the presenting structure, one or two vertical sheet piles are put inside the embankment and they are expected to keep total height of the embankment after severe erosion of landward slope. The effect of the sheet pile structures was discussed through hydraulic experiments in a horizontal open-channel with a 1/50 embankment model. Deformation of the embankment and the sheet pile structure was recorded by a video camera and strain gauges. Embankment height after overflow was about 70% and 95% of the initial height respectively for one and two sheet pile structure while it was only 17% for non-pile structure.
Influence of salinity and water temperature to number of labre of Coribicula japonica in Lake Jusan Peer-reviewed

Makoto Umeda, Shuntaro Matsune, Hitoshi Tanaka, Mikio Sasaki

Journal of JSCE, Ser.B2 (Coastal Eng.)　B2-70　(2)　I_1236-I_1240　2014/11/12
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.70.I_1236 　

ISSN： 1884-2399

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Lake Jusan is a brackish lake located in the down reaches of Iwaki River system and is a fishing place of Corbicula japonica. However, the annual catches of C. japonica have been fluctuated over time presumably because of aquatic environmental changes. To maintain sustainable fishery, it is necessary to understand the causal factors on reclamation processes of C. Japonica in relation to brackish environmental conditions of the lake. In this study, field measurements were conducted on salinity, water temperature, and distribution of larvae of C. Japonica. From the results, empirical formulation was made to estimate number of the larvae in the lake. By combining that formulation with numerical hydraulic simulation, a methodology was proposed to evaluate the influence of hydrological changes in the watershed on reclamation of C. japonica.
Morphological changes along the ishinomaki coast induced by the 2011 great east Japan tsunami and the relationship with coastal structures Peer-reviewed

Mohammad Bagus Adityawan, Nguyen Xuan Dao, Hitoshi Tanaka, Akira Mano, Keiko Udo

Coastal Engineering Journal　56　(3)　2014/09/25

DOI： 10.1142/S0578563414500168 　

ISSN： 2166-4250

eISSN： 1793-6292
Tsunami mitigation by using a shore-paralle canal and coastal embankment Invited Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Dao, Mohammad, Bagus Adityawan

Proceedings of 19th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (IAHR-APD)　2014/09/22
Behavior of coastal and estuarine morphology on Sendai Coast after the 2011 Great East Japan earthquake tsunami Peer-reviewed

Vo Cong Hoang, Yuta Mitobe, Hitoshi Tanaka

Proceedings of 19th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (IAHR-APD)　2014/09/22
Numerical modelling and experimental validation of tsunami overtopping coastal embankment Peer-reviewed

Nguyen Xuan Dao, Mohammad Bagus Adityawan, Hitoshi Tanaka

Proceedings of 19th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (IAHR-APD)　2014/09/22
Investigation of erosion mechanism on Nha Trang Coast in southern Vietnam Peer-reviewed

Nguyen Trung Viet, Nguyen Viet Duc, Vo Cong Hoang, Hitoshi Tanaka, U.V. Dinh, T.T. Tran, R. Almar, J-P. Lefebvre

Proceedings of 19th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (IAHR-APD)　2014/09/22
Study on flood shoal development in Lake Tofutsu Peer-reviewed

T. Horie, H. Kamada, K. Nirei, T. Sasaki, K. Hashimoto, S. Nakamura, Hitoshi Tanaka

Proceedings of 19th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (IAHR-APD)　2014/09/22

DOI： 10.2208/jscejoe.70.I_648 　
Study on water quality and hydrodynamics in West Lake, Hanoi by using mathematical model and field investigations Peer-reviewed

Le Thi Thanh Thuy, Hoang Thi, Ngoc Anh, Nguyen Manh Duc, Nguyen Trung Viet, Hitoshi Tanaka

Proceedings of 19th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (IAHR-APD)　2014/09/22
Recovery of estuarine morphology after the 2011 Tsunami Invited Peer-reviewed

Hitoshi Tanaka, Vo Cong Hoang, Yuta Mitobe

Proceedings of INDO-JAPAN Workshop on River Mouths, Tidal Flats and Lagoons　2014/09/15
Distance of tsunami propagation into rives Invited Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Kosuke Kayane, Mohammad Farid

Proceedings of INDO-JAPAN Workshop on River Mouths, Tidal Flats and Lagoons　2014/09/15
Experiments on local scour behind coastal dikes induced by tsunami overflow Invited Peer-reviewed

Yuta Mitobe, Mohammad Bagus Adityawan, Nguyen Xuan Dao, Hitoshi Tanaka

Proceedings of INDO-JAPAN Workshop on River Mouths, Tidal Flats and Lagoons　2014/09/15
Beach recovery processes on Sendai Coast after the 2011 Great East Japan Earthquake Tsunami Invited Peer-reviewed

Yuta Mitobe, Vo Cong Hoang, Hitoshi Tanaka

Proceedings of INDO-JAPAN Workshop on River Mouths, Tidal Flats and Lagoons　2014/09/15
Study on the relation of river morphology and tsunami propagation in rivers Peer-reviewed

Hitoshi Tanaka, Kosuke Kayane, Mohammad Bagus Adityawan, Min Roh, Mohammad Farid

Ocean Dynamics　64　(9)　1319-1322　2014/09

DOI： 10.1007/s10236-014-0749-y 　

ISSN： 1616-7341

eISSN： 1616-7228
Breaching and tsunami water drainage at old river mouth locations during The 2011 Tsunam Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Keiko Udo, Akira Mano

Proceedings of 34th International Conference on Coastal Engineering　2014/06
Modification of a turbulence model to analyze oscillatory boundary layers on a rough surface Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Proceedings of 34th International Conference on Coastal Engineering　2014/06
A new laboratory generation system for sediment transport induced by a solitary wave Peer-reviewed

Bambang Winarta, Hitoshi Tanaka

Proceedings of 34th International Conference on Coastal Engineering　2014/06
Coastal morphology change due to the 2011 Tsunami and subsequent recovery Invited Peer-reviewed

Hitoshi Tanaka, Yuta Mitobe, Vo Cong Hoang

Journal of JSCE, Ser.B3 (Ocean Eng.) (CD-ROM)　70　paper No.S2-2　2014/06

DOI： 10.2208/jscejoe.70.I_25 　
Study on flood shoal development in Lake Tofutsu Peer-reviewed

Takehito Horie, Hideto Kamada, Keisho Nirei, Koji Hashimoto, Keisuke Hashimoto, Seiji Nakamura, Hideo Kondo, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.) (CD-ROM)　70　paper No.103　2014/06

DOI： 10.2208/jscejoe.70.I_648 　
Morphological changes at the Nanakita River mouth after the Great East Japan Tsunami of 2011 Peer-reviewed

Hitoshi Tanaka, Mohammad Bagus Adityawan, Akira Mano

Coastal Engineering　86　14-26　2014/04

DOI： 10.1016/j.coastaleng.2014.01.002 　

ISSN： 0378-3839

eISSN： 1872-7379
Breach process simulation of coastal levees broken by the 2011 Tsunami Peer-reviewed

Tatsuki Iida, Shuichi Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

Journal of Coastal Research　70　(SI)　302-307　2014/04

DOI： 10.2112/SI70-051.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Effects of mud flows from the LUSI mud volcano on the Porong River estuary, Indonesia Peer-reviewed

Shuichi Kure, Bambang Winarta, Yuriko Takeda, Keiko Udo, Makoto Umeda, Akira Mano, Hitoshi Tanaka

Journal of Coastal Research　70　(SI)　568-573　2014/04

DOI： 10.2112/SI70-096.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Sensitivity analysis of relationship between tsunami disaster and coastal embankment structure Peer-reviewed

Nguyen Xuan Dao, Mohammad Bagus Adityawan, Hitoshi Tanaka, Vallam Sundar

Journal of JSCE, Ser.B1 (Hydr. Eng.)　70　(4)　I_43-I_48　2014/03/04
Publisher:
DOI： 10.2208/jscejhe.70.I_43 　

ISSN： 1880-8751
Tsunami propagation into rivers in Tohoku District Peer-reviewed

Kosuke Kayane, Min Roh, Hitoshi Tanaka, Makoto Umeda, Akira Mano, Mikio Sasaki, Seiki Kawagoe, Mitsukuni Tsuchiya, Yuta Mitobe

Journal of JSCE, Ser.B1 (Hydr. Eng.)　70　(4)　I_1165-I_1170　2014/03/04
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.70.I_1165 　

ISSN： 2185-467X

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On March 11, 2011, the Great East Japan Earthquake generated huge tsunami waves. Then, tsunami propagation occurred and expanded the flooded area. Tsunami propagation distance was collected and analyzed to estimate the area where we need the defense. It was found tsunami propagation distance in river is about 1.2 to 4.5 times as long as land area and, there is a good correlation between propagation distance in rivers and the bed slope. Furthermore, the dissipation coefficient of tsunami height was successfully estimated by applying the empirical equation and the general relation of wave height to distance.
Experiments on scouring behind coastal dikes induced by tsunami overflow Peer-reviewed

Yuta Mitobe, Mohammad Bagus Adityawan, Hitoshi Tanaka, Toshiya Kawahara, Tatsuaki Kurosawa, Kazutaka Otsushi

Journal of JSCE, Ser.B1 (Hydr. Eng.)　70　(4)　I_1147-I_1152　2014/03/04
Publisher:
DOI： 10.2208/jscejhe.70.I_1147 　

ISSN： 1880-8751
Scouring factor around breached coastal levees broken by 2011 Tohoku Earthquake Tsunami Peer-reviewed

Tatsuki Iida, Shuichi Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

Journal of JSCE, Ser.B1 (Hydr. Eng.)　70　(4)　I_1153-I_1158　2014/03
Publisher:
DOI： 10.2208/jscejhe.70.I_1153 　

ISSN： 1880-8751
泥火山噴出物の流入部下流におけるポロン川の水質環境

梅田信, 森文章, 田中仁, 呉修一,Suntoyo

東北地域災害科学研究　50　235-240　2014
2013年7月山形集中豪雨被害の特徴～月布川を一例として～

梅松理美, 呉修一, 有働恵子, 真野明, 田中仁

東北地域災害科学研究　50　75-80　2014
Characteristics of heavy rainfall disaster in Yamagata Prefecture on July 2013

梅松理美, 呉修一, 有働恵子, 真野明, 田中仁

東北地域災害科学研究　50　75-80　2014
泥火山噴出物流入に伴うインドネシアポロン川の河床変動

森文章, 三戸部佑太, 呉修一, Suntoyo, 梅田信, 田中仁, 有働恵子, 真野明

東北地域災害科学研究　50　235-240　2014
泥火山発生後のポロン川の河床変動解析

森文章, 三戸部佑太, 呉修一, Suntoyo, 梅田信, 田中仁, 有働恵子, 真野明

平成26年度土木学会東北支部技術研究発表会講演概要集　CD-ROM　(II-13)　2014
Investigation of morphological changes in the Porong River, Indonesia, induced by mud inflow from the LUSI mud Volcano

Shuichi Kure, Bambang Winarta, keiko Udo, Makoto Umeda, Akira Mano, Hitoshi Tanaka

Proceedings of the INDO-JAPAN Workshop on River mouths　26-33　2014
Breaching mechanism analysis of coastal levees hit by 2011 Tsunami

Tatsuki Iida, Shuich Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

IAHR-APD 2014 (21th Congress of the Asia and Pacific Division of the International Association for Hydro-Environment Engineering and Research)　156　2014
Nationwide post event survey and analysis of the 2011 Tohoku earthquake tsunami Peer-reviewed

Nobuhito Mori, Tomoyuki Takahashi, Shun Etsu Hamaura, Kazuya Miyakawa, Katsuhiko Tanabe, Keisuke Tanaka, Mitsuyuki Tanaka, Tsukasa Watanabe, Hideo Matsutomi, Kazunori Naoe, Takuya Noumi, Erika Yamaguchi, Shoichi Ando, Yushiro Fujii, Toshihide Kashima, Yasuo Okuda, Bun'ichiro Shibazaki, Tsutomu Sakakiyama, Masafumi Matsuyama, Takumi Yoshii, Kazuhisa Goto, Takashi Aida, Yuuji Kurata, Mabumi Miyazaki, Katuya Shutou, Jun Suzuki, Hikari Takeuchi, Takayuki Nakamura, Osamu Fujiwara, Kyoko Kagohara, Haruo Kimura, Junko Komatsubara, Yukari Miyashita, Yuichi Namegaya, Yuki Sawai, Masanobu Shishikura, Koichiro Tanigawa, Hermann Fritz, Ken Ichi Uzaki, Mikio Sasaki, Masato Minami, Hitoshi Endou, Masaki Hashimoto, Yutaka Kobashigawa, Masamitsu Kumagai, Masahiro Ietsune, Kazuhiko Nakamura, Aditya Gusman, Kazuomi Hirakawa, Kei Loki, Yugo Nakamura, Takafumi Nakayama, Yuichi Nishimura, Puma Putra, Ayumi Saruwatari, Yasunori Watanabe, Tomohito Yamada, Yasunori Nabetani, Hisamichi Nobuoka, Takashi Tamada, Yuriko Matsubayashi, Toshinori Ogasawara, Shigeki Sakai, Masao Abe, Yutaka Hayashi, Hideki Iino, Kazuhiro Iwakiri, Kazuhiro Kimura, Kenji Maeda, Masami Okada, Hiroaki Tsushima, Taro Kakinuma, Kei Yamashita, Shinya Umeda, Takahiro Nakamura, Shuji Seto, Kurokawa Takahiro, Tetsuya Torayashiki, Gozo Tsujimoto, Kohji Uno, Shoichi Yoshioka, Norio Dewa, Tetsuya Hayashi, Mitsuyoshi Kitamura, Shusaku Kuroda, Akihiko Nakahira, Takeshi Nozawa, Kazuya Taniwaki, Kunio Ohtoshi, Takashi Aoyama, Tatsuo Chiba, Hiroshi Enomoto, Kazunori Hirahara, Shigeki Murai, Hiroshi Narayama, Satoshi Yamanaka, Hitoshi Yamazaki, Satoshi Yoshiiri, Ryoukei Azuma, Yasuyuki Baba

Coastal Engineering Journal　54　(1)　1250001-1-1250001-27　2014/01/01

DOI： 10.1142/S0578563412500015 　

ISSN： 2166-4250

eISSN： 1793-6292
Breaching and tsunami water drainage at old river mouth locations during the 2011 Tsunami Peer-reviewed

Hitoshi Tanaka, Mohammad Bagus Adityawan, Keiko Udo, Akira Mano

Proceedings of the Coastal Engineering Conference　2014-January　(69)　I_411-I_415　2014

DOI： 10.2208/kaigan.69.I_411 　

ISSN： 0161-3782
Assessment of propagation characteristics for tsunami wave ascending river Peer-reviewed

Min Roh, Mohammad Bagus Adityawan, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　2014-January　2014

ISSN： 0161-3782
Experiments on local scour behind coastal dikes induced by Tsunami overflow Peer-reviewed

Yuta Mitobe, Mohammad Bagus Adityawan, Hitoshi Tanaka, Toshiya Kawahara, Tatsuaki Kurosawa, Kazutaka Otsushi

Proceedings of the Coastal Engineering Conference　2014-January　2014

ISSN： 0161-3782
Analysis of shoreline behavior on sendai coast before and after the 2011 Tsunami Peer-reviewed

Hoang Cong Vo, Yuta Mitobe, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　2014-January　2014

ISSN： 0161-3782
Variation of river flow due to the 2011 Tohoku Tsunami Peer-reviewed

M. Roh, M. B. Adityawan, H. Tanaka

Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2014　2289-2296　2014

DOI： 10.1201/b17133-305 　
Impact of the 2011 Great East Japan Tsunami on coastal and estuarine environments Invited

Hitoshi Tanaka

Keynote Lecture Book, HYDRO 2013 International, pp.1-13, 2013.(Key note lecture)　1-13　2013/12/05
Beach recovery processes on Sendai Coast after the 2011 Great East Japan Earthquake Tsunami Peer-reviewed

Yuta Mitobe, Vo Cong Hoang, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Proceedings of the HYDRO 2013 International　88-95　2013/12/05
Hydrodynamic conditions influenced by wave reflection from coastal structure Peer-reviewed

Widyaningtias, Hitoshi Tanaka, M. Cahyono

Proceedings of the Second International Conference on Sustainable Infrastructure and Built Environment (SIBE-2013) (CD-ROM)　2013/11/19
Relationship between Tsunami Disasters and Coastal Embankment Structure Peer-reviewed

Nguyen Xuan Dao, Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_346-I_350　2013/11/13
Publisher:
DOI： 10.2208/kaigan.69.I_346 　

ISSN： 1884-2399
Morphology Changes on Ishinomaki Coast due to The Great East Japan Tsunami Peer-reviewed

Nguyen Xuan Dao, Hitoshi Tanaka, Mohammad, Bagus Adityawan, Akira Mano, Keiko Udo

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_281-I_285　2013/11/13
Publisher:
DOI： 10.2208/kaigan.69.I_281 　

ISSN： 1884-2399
Estimation of Wave Celerity, Discharge and Flow Velocity of Tsunami Propagating into A River Peer-reviewed

Min Roh, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_256-I_260　2013/11/13
Publisher:
DOI： 10.2208/kaigan.69.I_256 　

ISSN： 1884-2399
Sand Spit Intrusion Into A River Mouth After The Great East Japan Tsunam Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Min Roh, Vo Cong Hoang

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_616-I_620　2013/11/13
Publisher:
DOI： 10.2208/kaigan.69.I_616 　

ISSN： 1884-2399
Morphology Changes on Sendai Coast after the 2011 Great East-Japan Earthquake Tsunami Peer-reviewed

Yuta Mitobe, Vo Cong Hoang, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_611-I_615　2013/11/13

DOI： 10.2208/kaigan.69.I_611 　
Analysis of the external forces and factors which caused the destruction of the revetments due to the Tohoku-Pacific Ocean Earthquake and Tsunami Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_981-I_985　2013/11/13

DOI： 10.2208/kaigan.68.I_1361 　
Beach Morphology Change of Southern Sendai Coast due to 2011 Tohoku Earthquake Tsunami Peer-reviewed

Keiko Udo, Akira Mano, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_1391-I_1395　2013/11/13

DOI： 10.2208/kaigan.69.I_1391 　
Distribution of Larvae of Corbicula Japonica in relation with brackish environment condition in Lake Jusan Peer-reviewed

Shuntaro Matsune, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki, Chikako Maruo

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_1101-I_1105　2013/11/13

DOI： 10.2208/kaigan.69.I_1101 　
Field Observation by the Lagrangian method for fish life history on the Primary Production in Northern Sea Peer-reviewed

Jun Yamamoto, Hiroshi Kawai, Masaomi Murata, Kenji Hayashi, Yoshinori Nishida, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2　(69)　I_1376-I_1380　2013/11/13
Publisher:
DOI： 10.2208/kaigan.69.I_1376 　

ISSN： 1884-2399
Numerical study on the relationship between tsunami hydrodynamics and coastal embankment structure Invited Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Dao, Mohammad, Bagus Adityawan

Numerical study on the relationship between tsunami hydrodynamics and coastal embankment structure, Proceedings of 13th Conference on Science and Technology (HCM City, Vietnam)　101-107　2013/10/31
Morphology change on Ishinomaki Coast induced by the 2011 Great East Japan Earthquake Tsunami Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Dao, Mohammad Bagus Adityawan, Keiko Udo, Akira Mano

Proceedings of The 7th International Symposium on Tsunami (ITS2013)　69　(2)　281-285　2013/09/25
Publisher:
ISSN： 1884-2399
Analysis of the external forces which caused the destruction of the revetments due to the Tohoku-Pacific Ocean Earthquake and Tsunami Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Proceedings of The 7th International Symposium on Tsunami (ITS2013)　69　(2)　981-985　2013/09/25
Publisher:
ISSN： 1884-2399
The effect of river slope on tsunami propagation ascending rivers Peer-reviewed

Roh Min, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Proceedings of 15th International Summer Symposium, JSCE　25-26　2013/09/04

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Roh Min, Mohammad Bagus Adityawan, Hitoshi Tanaka
Assessment of sediment deposit in Lake Tuni Peer-reviewed

Gabriela Sossa Ledezma, Hitoshi Tanaka

Proceedings of 15th International Summer Symposium, JSCE　35-36　2013/09/04
Study on river mouth erosion process due to tsunami Peer-reviewed

Min Roh, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Proceedings of the 12th International Symposium on River Sedimentation　1401-1407　2013/09/02
Assessment of the morphology change at the Samegawa River mouth, Japan Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Hisao Nagabayashi

Proceedings of the 12th International Symposium on River Sedimentation　1425-1432　2013/09/02
A deposition of mud in the Porong River, Indonesia, due to mud flows from the LUSI mud volcano Peer-reviewed

Shuichi Kure, Bambang Winarta, Yuriko Takeda, Keiko Udo, Makoto Umeda, Akira MAno, Hitoshi Tanaka

Journal of JSCE, Ser.G (Environmetal Eng.)　69　(5)　I_183-I_190　2013/09
Publisher:
DOI： 10.2208/jscejer.69.I_183 　
Assessment of variation in river discharge induced by the 2011 Tohoku Tsunami Peer-reviewed

Min Roh, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Proceedings of the 6th International Conference of Asia and Pacific Association of Hydrology and Water Resources (APHW)　2013/08
Dam break flow simulation using finite volume method Peer-reviewed

Mohammad Bagus Adityawan, Roh Min, Hitoshi Tanaka

Proceedings of the 6th International Conference of Asia and Pacific Association of Hydrology and Water Resources (APHW)　2013/08
Assessment of tsunami propagation from video recordings

Hitoshi Tanaka

Hydrolink, International Association for Hydro-Environment Engineering and Research (IAHR)　(2)　38-39　2013/06
Publisher: International Association for Hydro-Environment Engineering and Research (IAHR)
Breaching of coastal levees by the return flow of 2011 Tsunami Peer-reviewed

Tatsuki Iida, Shuichi Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

Proceediongs of 10th Annual Meeting of Aaia Oceania Geoscience Society (AOGS2013)　2013/06
Effects of mud flows from the LUSI mud volcano on river environment in the Porong River, Indonesia Peer-reviewed

Shuichi Kure, Yuriko Takeda, Bambang Winarta, Keiko Udo, Makoto Umeda, Akira Mano, Hitoshi Tanaka

Proceediongs of 10th Annual Meeting of Aaia Oceania Geoscience Society (AOGS2013)　2013/06
Long term aquatic environmental changes in Lake Jusan, Japan Peer-reviewed

Makoto Umeda, Shuntaro Matsune, Hitoshi Tanaka, Mikio Sasaki

Proceediongs of 10th Annual Meeting of Aaia Oceania Geoscience Society (AOGS2013)　2013/06
Shoreline changes at Sendai Port due to the Great North East Japan, Taunami of 2011 Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Proceedings of 7th International Conference on Coastal Dynamics　63-72　2013/06
The effect of bed slope to tsunami intrusion into rivers Peer-reviewed

Hitoshi Tanaka, Kosuke Kayane, Mohammad Bagus Adityawan

Proceedings of 7th International Conference on Coastal Dynamics　1601-1610　2013/06
Sensitivity analysis of shore-parallel canal for tsunami wave energy reduction Peer-reviewed

Nguyen Xuan Dao, Mohammad Bagus Adityawan, Hitoshi Tanaka

Proceedings of Civil Engineering in the Ocean　69　(2)　I_401-I_406　2013/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.69.I_401 　

ISSN： 2185-4688

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A numerical model based on Reynolds Averaged Navier-Stockes (RANS) equations was developed¹⁾ to account for the effects of wave-induced turbulence. In this study, a NEWFLUME model is applied to simulate the recent Great East Japan Earthquake and Tsunami 2011. A series of numerical experiments, which has topography similar to Sendai Coast in northeast part of Japan where was severely damaged from the 2011 Tsunami event, were carried out to investigate the sensitivity and effects of the shore-parallel canal in reducing tsunami energy. Numerical results show that the Kita-Teizan Canal which is parallel to the shoreline in Sendai Coast has significant effect in reducing tsunami energy and plays an important role in the mitigation of tsunami impacts.
Follow-up report on the 2011 Tsunami disaster in Japan Invited Peer-reviewed

Hitoshi Tanaka

Hydrolink, International Association for Hydro-Environment Engineering and Research (IAHR)　(1)　30　2013/04
Tsunami: Behind the scene –asessing the tsunami propagation from video recordings- Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Min Roh

The International Review of Weather, Climate, and Hydlorogy Technologies and Services　(April)　12-15　2013/04
Boundary layer approach in the modeling of breaking solitary wave runup Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Pengzhi Lin

Coastal Engineering　73　167-177　2013/03

DOI： 10.1016/j.coastaleng.2012.11.005 　

ISSN： 0378-3839
Investigation of the river mouth morphology changes in Samegawa River, Japan Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Hisao Nagabayashi

Journal of JSCE, Ser.B1 (Hydr.Eng.)　69　(4)　I_265-I_270　2013/03

DOI： 10.2208/jscejhe.69.I_265 　
泥火山噴出物の流入がインドネシア・ポロン川に与えた影響評価

呉修一, 武田百合子, 有働恵子, 梅田信, 真野明, 田中仁

東北地域災害科学研究　49　115-120　2013
Breaching of sandy coast due to the 2011 tsunami

49　213-218　2013
Publisher:
Breach Process Simulation of Coastal Levees Broken

Tatsuki Iida, Shuichi Kure, Keiko Udo, Akira Mano, Hitoshi Tanaka

The 9th APRU Research Symposium on Multi-Hazards around the Pacific Rim Proceedings　214-214　2013
Bearching of sandy coast due to the 2011 tsunami

田中仁, 真野明, 有働恵子

東北地域災害科学研究　49　213-218　2013
EXPERIMENTAL RESEARCH ON DETACHED BREAKWATERS' EFFECT ON TSUNAMI DISASTER MITIGATION Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka

COASTAL STRUCTURES 2011, VOL 1 & 2　paper No.D2-118 (CD-ROM)　1276-1286　2013
DISCUSSION OF OVERWASH PREVENTION CONSTRUCTION ON THE NORTHERN PART OF SENDAI COAST Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka

COASTAL STRUCTURES 2011, VOL 1 & 2　paper No.D5-128 (CD-ROM)　1360-1369　2013
THE EFFECT OF SENDAI PORT BREAKWATER TO SEDIMENT MOVEMENT ON ITS VICINITY Peer-reviewed

Eko Pradjoko, Hitoshi Tanaka, Elsa Henry

COASTAL STRUCTURES 2011, VOL 1 & 2　paper No.D6-133 (CD-ROM)　1408-1417　2013
A Study on Factors Related to Long-Term Environmental Changes in Lake Jusan Peer-reviewed

Shuntaro Matsune, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki

PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS I AND II　69　(4)　1629-1634　2013

DOI： 10.2208/jscejhe.69.I_1507 　
Breaking process and mechanism of coastal levees on Sendai Bay Coast hit by the 2011 mega tsunami Peer-reviewed

Akira Mano, Tatsuki Iida, Keiko Udo, Hitoshi Tanaka

Journal of Coastal Research　65　(SPEC. ISSUE 65)　772-777　2013

DOI： 10.2112/SI65-131 　

ISSN： 0749-0208

eISSN： 1551-5036
On the Shoreline and River Mouth Morphology Changes around Samegawa River Following the Great East Japan Tsunami of 2011 Peer-reviewed

Hitoshi Tanaka, Mohammad Bagus Adityawan, Hisao Nagabayashi

PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS I AND II　261-270　2013
Dam Break Wave Simulation Using the Simultaneous Coupling Method Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV　2013
Effectiveness of a Shore-parallel Canal to Reduce Tsunami Impact Peer-reviewed

Nguyen Xuan Dao, Mohammad Bagus Adityawan, Hitoshi Tanaka, Pengzhi Lin

PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV　2013
Verification of a Numerical Model Coupling between Shallow Water Equation and k-w Model for Simulating Breaking Solitary Wave Run-Up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-68　(2)　I_011-I_015　2012/11
Publisher:
DOI： 10.2208/kaigan.68.I_11 　

ISSN： 1884-2399
Influence of River Bed Slope for Tsunami Propagation into Rivers Peer-reviewed

Kosuke Kayane, Hitoshi Tanaka, Mohammad, Bagus Adityawan

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-68　(2)　I_176-I_180　2012/11
Publisher:
DOI： 10.2208/kaigan.68.I_176 　

ISSN： 1884-2399
River Mouth Morphology Changes at the Nanakita River Mouth After The Great East Japan Tsunami Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan, Akira Mano

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-68　(2)　I_601-I_605　2012/11
Publisher:
DOI： 10.2208/kaigan.68.I_601 　

ISSN： 1884-2399
Breaching of Sandy Coast and Spit Due To Tsunami and Their Recovery Peer-reviewed

Ryutaro Hirao, Hitoshi Tanaka, Mohammad, Bagus Adityawan, Makoto Umeda, Akira Mano, Keiko Udo

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-68　(2)　I_581-I_585　2012/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.68.I_581 　

ISSN： 1884-2399

eISSN： 1883-8944
Influence of a river flood on the environment in Mukawa coast fishing ground, Hokkaido. Peer-reviewed

Jun Yamamoto, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-68　I_1121-I_1125　2012/11

DOI： 10.2208/kaigan.68.I_1121 　
Analysis of Structural Damages with massive Geomorphic Change due to Tsunami Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-68　I_1361-I_1365　2012/11

DOI： 10.2208/kaigan.68.I_1361 　
Investigation of shoreline change caused by the Great East Japan Taunami 2011around Samegawa River mouth Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Hisao Nagabayashi

Proceedings of International Sessions of Coastal Engineering Conference　3　31-35　2012/11
Simultaneous coupling method: A new approach in wave modeling Invited Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan

Proceedings of The Second International Conference on Port, Coastal, and Offshore Engineering (2nd ICPCO) (keynote lecture)　2012/11
Theory of salt-water movement in Iwaki River mouth Peer-reviewed

Mikio Sasaki, Hitoshi Tanaka, Makoto Umeda

Proceedings of 10th International Conference on Hydroscience & Engineering (ICHE)　2012/11
Using a two-equation turbulence model to study irregular wave bottom boundary layers Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Proceedings of 10th International Conference on Coasts, Ports and Marine Structures (ICOPMAS 2012)　2012/11
Development of a new method for wave runup simulation by integrating k-w model to shallow water equation Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Earth, Planets and Space　64　945-954　2012/10

DOI： 10.5047/eps.2011.02.012 　
Tsunami disasters in coastal and estuarine environments due to the 2011 Great East Japan Earthquake Invited Peer-reviewed

Hitoshi Tanaka

Proceedings of 4th International Conference on Estuaries and Coasts (Keynote lecture)　423-431　2012/10
Simulation of solitary wave run up on a sloping beach using SCM method Peer-reviewed

Mohammad Bagus Adityawanand, Hitoshi Tanaka

Proceedings of 4th International Conference on Estuaries and Coasts　352-360　2012/10
Detached breakwaters’ stability against solitary tsunami wave Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka

Proceedings of 4th International Conference on Estuaries and Coasts　321-327　2012/10
Environmental factors affecting on Juvenille population of Corbicula japonica in Lake Jusan Peer-reviewed

Makoto Umeda, Atas Pracoyo, Hitoshi Tanaka, Mikio Sasaki

Proceedings of 4th International Conference on Estuaries and Coasts　239-245　2012/10
Prediction of salt water movement in Iwaki River Mouth Peer-reviewed

Mikio Sasaki, Hitoshi Tanaka, Makoto Umeda

Proceedings of 4th International Conference on Estuaries and Coasts　26-32　2012/10
Two-dimensional numerical modeling of a dam break using the FORCE MUSCL scheme Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Proceddings of the 8th APRU Research Symposium on Multi-hazards around the Pacific Rim　56-57　2012/09
Assessment of tsunami propagation into rivers Peer-reviewed

Min Roh, Mohammad, Bagus Adityawan, Hitoshi Tanaka

Proceddings of the 8th APRU Research Symposium on Multi-hazards around the Pacific Rim　64-65　2012/09
Investigation of tsunami propagation characteristics in river and on land induced by the great east Japan earthquake 2011 Peer-reviewed

Mohammad Bagus Adityawan, Min Roh, Hitoshi Tanaka, Akira Mano, Keiko Udo

Journal of Earthquake and Tsunami　6　(3)　1250033_1-1250033_22　2012/09

DOI： 10.1142/S1793431112500339 　

ISSN： 1793-4311

eISSN： 1793-7116
Shoreline change around a river mouth before and after the 2011 East Japan Earthquake Tsunami Invited Peer-reviewed

Hitoshi Tanaka, Eko Pradjoko, Nguyen Xuan Tinh, Ryutaro Hirao

Proceedings of 18th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research(CD-ROM) (invited paper)　2012/08/22
Estimation of tsunami celerity using video image analysis Peer-reviewed

Min Roh, Hitoshi Tanaka, Mohammad, Bagus Adityawan, Akira Mano, Keiko Udo

Proceedings of 18th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research　864-865　2012/08/22
Study of structural damages with massive geomorphic change due to tsunami Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Proceedings of The 8th International Conference on Disaster management (CD-ROM)　165-170　2012/08
The effect of river mouth morphological features on tsunami intrusion Peer-reviewed

Mohammad Bagus Adityawan, Min Roh, Hitoshi Tanaka, Mohammad Farid

Proceedings of The 8th International Conference on Disaster management (CD-ROM)　75-83　2012/08
Bed stress investigation under breaking solitary wave runup Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Pengzhi Lin

Proceedings of 33rd International Conference on Coastal Engineering　2012/07
Destruction mechanism of coastal levees on the Sendai Bay Coast by 3.11 Tsunamis Peer-reviewed

Akira Mano, Hitoshi Tanaka, Keiko Udo

Proceedings of 33nd International Conference on Coastal Engineering　2012/07
Measurement of flow velocity for tsunami propagation into river Peer-reviewed

Min Roh, Hitoshi Tanaka, Mohammad, Bagus Adityawan

Journal of JSCE, Ser.B3 (Ocean Eng.)　68　(4)　I_72-I_77　2012/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.68.I_72 　

ISSN： 2185-4688

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The flow velocity of tsunami wave was estimated by using Particle Image Velocimetry(PIV) and Particle Tracking Velocimetry(PTV). These methods have many advantages that can be used to measure velocity under limited data such as the 2011 off the Pacific Coast of Tohoku Tsunami. The results of video image analysis are evaluated by comparing with theoritical approach. The collected video image is stabilized and rectified in the pre-processing to enhance the accuracy of PIV method, whereas the proposed theoretical method is based on conservation equation. It is found that the estimated flow velocity range is consistent regardless of the method. The method is expected to perform well for analyzing videos and providing information in tsunami cases where there is no adequate measurement data.
Investigation on depth of closure influenced by wave reflection from coastal structure Peer-reviewed

Widyaningtias, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Eng.)　68　(4)　I_708-I_713　2012/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejoe.68.I_708 　

ISSN： 2185-4688

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The depth of closure in Sendai Port is estimated using 10 years bathymetry data and proposed as a longshore variation. The hydrodynamic condition is simulated using Boussinesq equation (Peregrine, 1967) which was modified by applying long wave theory. Using wave data from 1991 to 2003, 20% wave height in deep areas is applied as a representative wave. From the modeling, bottom velocities in the x and y directions are obtained. The result is used to calculate the maximum bottom velocities just outside the boundary layer. The effect of wave reflection is observed using the velocity distribution and maximum bottom shear stress. By integrating the velocities in the x and y directions, the area that is influenced by reflected waves can be observed. The results are depicted as a spatial map. The longshore variation of the depth of closure is overlaid on the results to confirm the influence of wave reflection for its variation.
Evaluation de profils de viscosité turbulente en couches limites oscillantes par un modèle à deux équations k-w Peer-reviewed

Alicia Andre, Loreline Kerlidou, Rafik Absi, Hitoshi Tanaka

Proceedings of 12th French Conference on Coastal Engineering (CD-ROM)　2012/05
Coastal and estuarine morphology changes induced by the 2011 great east Japan earthquake tsunami Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Makoto Umeda, Ryutaro Hirao, Eko Pradjoko, Akira Mano, Keiko Udo

Coastal Engineering Journal　54　(1)　2012/03

DOI： 10.1142/S0578563412500106 　

ISSN： 2166-4250

eISSN： 1793-6292
Experimental study of transition to turbulence in a solitary wave boundary layer Peer-reviewed

Bambang Winarta, Hitoshi Tanaka

Journal of JSCE, Ser.B1 (Hydr.Eng.)　56　2012/03
Study on tsunami celerity and velocity ascending rivers Peer-reviewed

Min Roh, Hitoshi Tanaka, Mohammad, Bagus Adityawan, Akira Mano, Keiko Udo

Journal of JSCE, Ser.B1 (Hydr.Eng.)　2012/03
River mouth morphoplogy change and its problems after the Great East Japan Earthquake Tsunami Peer-reviewed

Ryutaro Hirao, Hitoshi Tanaka, Makoto Umeda, Nguyen Xuan Tinh, Eko Pradjoko, Akira Mano, Keiko Udo

Journal of JSCE, Ser.B1 (Hydr.Eng.)　2012/03

DOI： 10.1142/S0578563412500106 　
Factors effecting on mortality rate on Corbicula japonica in Lake Jusan Peer-reviewed

Atas Pracoyo, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki, Masayasu Nagasaki

Journal of JSCE, Ser.B1 (Hydr.Eng.)　2012/03
Prediction model of taste-and-odor events in Kamafusa Peer-reviewed

Duong Hai Thuan, Makoto Umeda, Masahiko Matsukawa, Hitoshi Tanaka

Journal of JSCE, Ser.B1 (Hydr.Eng.)　68　(4)　I_289-I_294　2012/03
COASTAL AND ESTUARINE MORPHOLOGY CHANGES INDUCED BY THE 2011 GREAT EAST JAPAN EARTHQUAKE TSUNAMI Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Makoto Umeda, Ryutaro Hirao, Eko Pradjoko, Akira Mano, Keiko Udo

COASTAL ENGINEERING JOURNAL　54　(1)　1250010-1-1250010-25　2012/03

DOI： 10.1142/S0578563412500106 　

ISSN： 0578-5634
Impact of the 2011 Tohoku earthquake and tsunami on beach morphology along the northern sendai coast Peer-reviewed

Keiko Udo, Daisuke Sugawara, Hitoshi Tanaka, Kentaro Imai, Akira Mano

Coastal Engineering Journal　54　(1)　1250009-1-1250009-15　2012/03

DOI： 10.1142/S057856341250009X 　

ISSN： 2166-4250

eISSN： 1793-6292
Earthquake, Geology, and Tsunami

Kawase, H., Matsushima, S., Baoyintu, Motosaka, M., Ohno, S., Watanabe, H., Tanaka, R., Tanaka, H., Ogawa, J., Yamaya, R., Take, Y.

Geotechnical, Geological and Earthquake Engineering　23　2012
Publisher: Geotechnical, Geological and Earthquake Engineering
DOI： 10.1007/978-4-431-54097-7_2 　
Evaluation de profils de viscosité turbulente en couches limites oscillantes par un modèle à deux équations k-ω

Hitoshi Tanaka

XIIèmes Journées, Cherbourg　2012

DOI： 10.5150/jngcgc.2012.009-k 　
New Disaster Research Institute and Engineering Education-One Year after the 2011 Great East Japan Earthquake-

TANAKA Hitoshi

Journal of Jsee　60　(3)　3_2-3_2　2012
Publisher: Japanese Society for Engineering Education
DOI： 10.4307/jsee.60.3_2 　

ISSN： 1341-2167
Bed stress assessment under solitary wave run-up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Earth, Planets and Space　64　(10)　945-954　2012

DOI： 10.5047/eps.2011.02.012 　

ISSN： 1343-8832

eISSN： 1880-5981
RIVER MOUTH MORPHOLOGY CHANGE AND ITS PROBLEMS AFTER THE GREAT EAST JAPAN EARTHQUAKE TSUNAMI

HIRAO Ryutaro, TANAKA Hitoshi, UMEDA Makoto, NGUYEN XUAN Tinh, PRADJOKO Eko, MANO Akira, UDO Keiko

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　68　(4)　I_1735-I_1740　2012
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.68.I_1735 　

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The Great East Japan Earthquake Tsunami occurred on March 11, 2011 induced big change in coastal and estuarine morphology. Tanaka et al. (2011) has already made a report on these morphology changes. In this paper, subsequent morphology recovery process after the tsunami is investigated for several rivers in Miyagi Prefecture. It is found that at the Naruse and Natori rivers, recovery of the river mouth morphology is extremely slow due to limited amount of sediment supply from the adjacent coastal area with coastal structures interrupting longshore sediment movement, whereas the Nanakita River mouth and the Akaiko Lagoon show relatively quicker recovery. This result shows importance of sediment budget analysis and management covering not only riverine area but also surrounding costal area.
Applicability of CADMAS-SURF to evaluate detached breakwater effects on solitary tsunami wave reduction Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka

Earth, Planets and Space　64　(10)　955-964　2012

DOI： 10.5047/eps.2011.06.030 　

ISSN： 1343-8832

eISSN： 1880-5981
Validation of a new generation system for bottom boundary layer beneath solitary wave Peer-reviewed

Hitoshi Tanaka, Bambang Winarta, Suntoyo, Hiroto Yamaji

Coastal Engineering　59　(1)　46-56　2012/01

DOI： 10.1016/j.coastaleng.2011.07.003 　

ISSN： 0378-3839

eISSN： 1872-7379
The 2010 chilean and the 2011 Tohoku tsunami waves impact to rivers in the Tohoku Region, Japan Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh

Proceedings of the Coastal Engineering Conference　2012
Characterization of transition to turbulence in solitary wave boundary layer Peer-reviewed

Bambang Winarta, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of the Coastal Engineering Conference　2012

DOI： 10.9753/icce.v33.waves.22 　

ISSN： 0161-3782
Depth of closure determination in the vicinity of coastal structure Peer-reviewed

W. Widyaningtias, Hitoshi Tanaka, Susumu Kanayama

Proceedings of the Coastal Engineering Conference　2012

DOI： 10.9753/icce.v33.sediment.87 　

ISSN： 0161-3782
Stability of wave-dissipating concrete blocks of deached breakwaters against tsunami Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　2012
Morphology change caused by the 2011 great tohoku tsunami wave - Mechanism of recent closure and breaching of the Nanakita River Mouth Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Ryutaro Hirao, Eko Pradjoko, Akira Mano, Keiko Udo

Proceedings of the Coastal Engineering Conference　2012
Evaluation of celerity and velocity for tsunami propgation into rivers Peer-reviewed

Min Roh, Hitoshi Tanaka, Mohammad Bagus Aditaywan, Akira Mano, Keiko Udo

Proceedings of the Coastal Engineering Conference　2012
Eddy viscosity profiles for wave boundary layers: Validation and calibration by A k-ω model Peer-reviewed

Rafik Absi, Hitoshi Tanaka, Loreline Kerlidou, Alicia André

Proceedings of the Coastal Engineering Conference　2012

DOI： 10.9753/icce.v33.waves.63 　

ISSN： 0161-3782
Applicability of CADMAS-SURF to evaluate detached breakwater effects on solitary tsunami wave reduction Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka

EARTH PLANETS AND SPACE　64　(10)　955-964　2012

DOI： 10.5047/eps.2011.06.030 　

ISSN： 1880-5981
Destruction mechanism of coastal levees on tht sendai bay coast hit by the 2011 tsunami Peer-reviewed

Akira Mano, Hitoshi Tanaka, Keiko Udo

Proceedings of the Coastal Engineering Conference　35　309-320　2012
Publisher: Springer Netherlands
DOI： 10.1007/978-94-007-7269-4_16 　

ISSN： 1878-9897

eISSN： 2213-6959
Improvement of Generation System for Solitary Wave Boundary Layer Peer-reviewed

Bambang Winarta, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_076-I_080　2011/11
Publisher:
DOI： 10.2208/kaigan.67.I_76 　

ISSN： 1884-2399
Evaluation of Sediment Budget Around a River Entrance Peer-reviewed

Eko Pradjoko, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_616-I_620　2011/11
Publisher:
DOI： 10.2208/kaigan.67.I_616 　

ISSN： 1884-2399
Longshore Variation of Depth of Closure around Coastal Structure Peer-reviewed

Widyaningtias, Hitoshi Tanaka, Susumu Kanayama

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_526-I_530　2011/11
Publisher:
DOI： 10.2208/kaigan.67.I_526 　

ISSN： 1884-2399
Coupling between Shallow Water Equation and k-w Model for Simulating Breaking Solitary Wave Run-Up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_041-I_045　2011/11
Publisher:
DOI： 10.2208/kaigan.67.I_41 　

ISSN： 1884-2399
Beach Morphology Change Induced by The 2011 Great East Japan Earthquake Tsunami Peer-reviewed

Hitoshi Tanaka, Akira Mano, Keiko Udo

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_571-I_575　2011/11

DOI： 10.2208/kaigan.67.I_571 　
Effect of Temperature and Salinity during Spawning Season to the Population of Juvenile of Cobicula japonica in Lake Jusan Peer-reviewed

Atas Pracoyo, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_1001-I_1005　2011/11
Publisher:
DOI： 10.2208/kaigan.67.I_1001 　

ISSN： 1884-2399
Experimental study on stability of wave-dissipating concrete blocks of detached breakwaters against tsunami Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka, Masato Yamamoto

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_796-I_800　2011/11

DOI： 10.2208/kaigan.67.I_796 　
Field observation to estimate the primary production in the destratification process in Northern Japan Sea Peer-reviewed

Jun YAMAMOTO, Mitsuhiro WATANABE, Kenji HAYASHIDA, Hiroaki MINE, Kazuyoshi SAKAMOTO, Yoshinori NISHIDA, Hitoshi TANAKA

Journal of JSCE, Ser.B2 (Coastal Engineering)　B2-67　(1)　I_1026-I_1030　2011/11

DOI： 10.2208/kaigan.67.I_1026 　
Boundary layer assessment under breaking solitary wave run up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.A2 (Applied Mechanics)　14　I_599-I_606　2011/09/06

DOI： 10.2208/jscejam.67.I_599 　
An efficient hydrodynamic numerical model with wetting-drying capability Peer-reviewed

Purwanto Bekti Santoso, Nastain, Wahyu Widiyanto, Susumu Kanayama, Hitoshi Tanaka

Journal of Engineering Science and Technology　6　(4)　445-458　2011/08

ISSN： 1823-4690
The Japan tsunami disaster

Hitoshi Tanaka

Water Engineering Australia　5　(4)　23-25　2011/07
Boundary layer under oscillatory wave Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

ISRN Applied Mathematics　2011　Article ID 814045　2011/07

DOI： 10.5402/2011/814045 　

ISSN： 2090-5564 2090-5572

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<jats:p>Turbulence due to wave motion and propagation is a very important aspect in sediment transport modeling. The boundary layer characteristic during the process will highly influence the sediment transport mechanism at the bottom. 1D model approach has been widely used to assess the turbulent boundary layer. However, the need for a more detailed model leads to the development of a more sophisticated models. This study presents a 2D turbulent model using<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>k</mml:mi><mml:mtext>-</mml:mtext><mml:mi>ω</mml:mi></mml:math>equation to approach the turbulent boundary layer characteristic in oscillatory wave. The equations are solved using finite-difference center scheme. The model is applied to the case of oscillatory sinusoidal and skew wave. The velocity profile and bed stress were compared to those obtained from wind channel experimental data and 1D<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>k</mml:mi><mml:mtext>-</mml:mtext><mml:mi>ω</mml:mi></mml:math>model from previous study.</jats:p>
Tsunami in Japan - 10 Questions to Prof. Hitoshi Tanaka

Hitoshi Tanaka

Hydrolink　(3)　38-39　2011/06
Publisher: International Association for Hydro-Environment Engineering and Research (IAHR)
Tsunami disaster induced by the 2011 Great East Japan Earthquake

Hitoshi Tanaka

Hydrolink　(3)　36-37　2011/06
Publisher: International Association for Hydro-Environment Engineering and Research (IAHR)
Applicability of new generation system for solitary wave boundary layer Peer-reviewed

Bambang Winarta, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of 33rd IAHR Congress　2011/06
Modelling of breaking solitary wave run up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Engineering)　67　(4)　2011/06
Closed conduit system for generating boundary layer induced by solitary wave Peer-reviewed

Bambang Winarta, Hitoshi Tanaka

Journal of JSCE, Ser.B3 (Ocean Engineering)　67　(4)　2011/06

DOI： 10.2208/jscejoe.67.I_613 　
Mechanism of recent rapid beach erosion on the Yokosuka Coast, Japan Peer-reviewed

Xuan Tinh Nguyen, Hitoshi Tanaka, Kumiko Hongo, Shigeyuki Masuya, Toshimutsu Takagi, Takao Suzuki

Proceedings of International Conference on Coastal Sediments ’11　2011/05
Study on tsunami propagation into rivers

Tohoku journal of natural disaster science　47　89-94　2011/03
Publisher:
Numerical simulation of sand spit flushing at the Nanakita River mouth for estimating downstream end water level Peer-reviewed

Hitoshi Tanaka, Tatsuya Sato, Takeshi Suzuki, Hiroshi Senoo, Hirokazu Naganuma, Katsuya Takamizu, Koji Sato

Journal of JSCE, Ser.B1 (Hydraulic Engineering)　B1-67　S883-S888　2011/02
Evaluation of density current due to wind effect occurred from nothern shallow area in Lake Inawashiro Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka, Yutaka Fujita, Makoto Umeda, Susumu Kanayama

Journal of JSCE, Ser.B1 (Hydraulic Engineering)　B1-67　S1507-S1512　2011/02
Bed stress importance under solitary wave runup Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of JSCE, Ser.B1 (Hydraulic Engineering)　B1-67　S241-S246　2011/02
Validity of generation system for solitary wave boundary layer Peer-reviewed

Bambang Winarta, Hitoshi Tanaka

Journal of JSCE, Ser.B1 (Hydraulic Engineering)　B1-67　S235-S240　2011/02
LABORATORY EXPERIMENT ON CROSS-SHORE BARRIER SPIT EVOLUTION BY STORM DYNAMICS Peer-reviewed

Nguyen Xuan Tinh, Magnus Larson, Chantal Donnelly, Hitoshi Tanaka

Coastal Engineering Proceedings　1　(32)　32　2011/01
Publisher: Coastal Engineering Research Council
DOI： 10.9753/icce.v32.sediment.32 　

ISSN： 2156-1028
MONTHLY VARIATION OF WAVE SET-UP HEIGHT IN THE YONESHIRO RIVER MOUTH Peer-reviewed

Hitoshi Tanaka, Hanako Nakura, Xuan Tinh Nguyen

Coastal Engineering Proceedings　1　(32)　39　2011/01
Publisher: Coastal Engineering Research Council
DOI： 10.9753/icce.v32.currents.39 　

ISSN： 2156-1028
Sediment deposit in Lake Tuni, Bolovia — experimental study and predictive model Peer-reviewed

Hitoshi Tanaka

Advances in Geosciences: Volume 23: Hydrological Science (HS)　23　(Hydrological Science (HS))　185-195　2011/01/01
Publisher: World Scientific Publishing Co.
DOI： 10.1142/9789814355339_0015 　
PROPAGATION OF 2010 CHILEAN TSUNAMI INTO RIVERS IN TOHOKU DISTRICT -TSUNAMI INTRUSION AND RIVER MOUTH MORPHOLOGY- Peer-reviewed

TANAKA Hitoshi, NGUYEN Xuan Tinh, ROH Min, NGUYEN Xuan Dao

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)　67　(4)　I_1627-I_1632　2011
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejhe.67.I_1627 　

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Serious Chilean Earthquake, rating magnitude of 8.8, occurred on February 27, 2010, and caused large tsunami waves in the Pacific Ocean after that. The main objective of this study is to investigate the tsunami wave propagation into rivers with different morphologies based on a range of details measurement data sets from 20 rivers. The analyzed results show that the tsunami wave can affect up to 22km upstream of river at the most. Furthermore, it is observed that there exists distinct difference of tsunami height in the river dependent on the different river mouth morphology. Thus, classification of the rivers has been proposed based on the rank of rivers and river mouth morphology.
Field measurement and numerical studies on the tsunami propagation into upstream of rivers Peer-reviewed

Hitoshi Tanaka, Nguyen Xuan Tinh, Nguyen Xuan Dao

34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering　1317-1324　2011
Effect of river mouth morphology on tsunami propagation ascending rivers Peer-reviewed

Roh Min, Nguyen Xuan Tinh, Tanaka Hitoshi

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　67　(2)　I_607-I_614　2011
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.67.I_607 　

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The tsunami wave, approaching to river entrance, is related with various river characteristics. In wave propagation process, river mouth morphology is one of the dominant factors because it is first the feature of the river when the tsunami wave arrived near rivers. At the tsunami wave generated by the 2010 Chilean Earthquake, the field observation data indicated a different aspect of wave propagation according to the river entrance structure. In this study, in order to evaluate the influence of tsunami wave due to river mouth morphology, a numerical experiment was conducted for hypothetical cases are based on the representative river mouth type. The results of numerical simulation and analysis of measurement applied to the effect of tsunami wave by the change of the river mouth.
Influence of River Mouth Topography and Tidal Variation on Tsunami Propagation into Rivers Peer-reviewed

KAYANE Kousuke, ROH Min, TANAKA Hitoshi, NGUYEN Xuan Tinh

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　67　(2)　I_246-I_250　2011
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.67.I_246 　

ISSN： 1884-2399

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By analyzing the detailed water measurement data sets outside/inside of rivers in Tohoku District which were caused by the 2010 Chilean Tsunami, the influences of this tsunami event are estimated. Based on the topographical river mouth, the relationship between river characteristics and tsunami wave height reduction can be derived empirically. This study indicates that the tsunami propagation distance into the river upstream is not only depended on the river mouth geographical features such as river mouth width and depth but also on the tidal level. The larger river entrance, the easier tsunami intrudes. In some narrow and shallow river mouths, the tsunami can only pass through the entrance during the high tide. The empirical relationship between tsunami height and river width has a correlation to the Green's Law
Coupling between shallow water equation and k-w model for simulating solitary wave run-up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

J. JSCE, Ser.B2 (Coastal Engineering)　B2-66　(1)　91-95　2010/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.91 　

ISSN： 1884-2399

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Solitary wave is considered to resemble a tsunami wave. Thus solitary wave study is very important for coastal area. The shallow water equation (SWE) model is commonly used in tsunami modeling. The Manning method is generally used to assess the bed stress term. Nevertheless, boundary layer approach in assessing the bed stress would provide a more accurate prediction. In this study, a new method for solitary wave run up modeling has been developed by simultaneous coupling between SWE and k-ω model. Bed stress in the SWE is assessed directly from the boundary layer equation using k-ω model. The new method was used to simulate solitary wave run up (Synolakis, 1987). Water surface and run up height were compared. Further analysis to the momentum balance was conducted.
Shoreline evolution around a river entrance Peer-reviewed

Eko Pradjoko, Hitoshi Tanaka

J. JSCE, Ser.B2 (Coastal Engineering)　B2-66　(1)　541-545　2010/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.541 　

ISSN： 1884-2399

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The shoreline position in alongshore direction around the Nanakita River mouth was measured from aerial photograph which have been taken every 2 months in 20 years. Empirical Orthogonal Function analysis was used to decompose the data into the dominant mode of shoreline variability for left and right side of river mouth. The results were also examined in relation with wave parameter and river discharge. The first mode shows the same shoreline movement between left and right side which reveals cross-shore process. The analysis of second mode and its correlation with river discharge reflects the influence of long-shore process. This mode also reveals the influence of river mouth in interrupting the long-shore sediment transport. The higher modes reflect the formation of beach cusps in relation with wave parameter.
Wave set-up height and salinity intrusion in Yoneshiro River mouth in winter Peer-reviewed

Hanako Nakura, Hitoshi Tanaka, Makoto Umeda

J. JSCE, Ser.B2 (Coastal Engineering)　B2-66　(1)　316-320　2010/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.316 　

ISSN： 1884-2399

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Water level rise and salinity intrusion in the mouth of the Yoneshiro River in Akita Prefecture, Japan is investigated. Geographical features of the river mouth are greatly dependent on seasonal variation of major physical forcings. Therefore, the characteristic of wave set-up is assumed to be different according to the season, and seasonal variation of wave set-up is quantified. It is found in winter, the water level rise by wave set-up becomes approximately 10% of the deep water wave height, whereas this ratio decreases rapidly in summer due to flushing of sediment around the river mouth caused by frequent occurrence of floods. In spite of such water level rise due to wave set-up in winter, salinity intrusion was not observed in the river because of the closure of the river entrance caused by severe storms.
Experimental study on detached breakwaters' effect on tsunami disaster mitigation Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka, Masato Yamamoto

J. JSCE, Ser.B2 (Coastal Engineering)　B2-66　(1)　886-890　2010/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.886 　

ISSN： 1884-2399

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In recent years, the risk of occurrence of tsunamis generated by near shore earthquakes, such as, Tokai, Tonankai, Nankai and off-Miyagi is considered to be higher than before as well as off shore tsunami traveling long distance, e.g., the 2010 Chilean tsunami. Tsunami force onto vertical walls, such as seawalls, has been studied in detail. Detached breakwaters are widely applied in front of seawalls especially in Japan. However, effect of such kind of detached breakwaters to reduce run-up and wave force onto seawalls has not been studied. In our study, hydraulic model tests have been systematically and carefully carried out using solitary tsunami waves with and without detached breakwaters to evaluate the effectiveness of detached breakwaters from the viewpoint of reducing run-up and wave pressure onto seawalls.
Field observation for planning the fishing ground development in north Japan Sea Peer-reviewed

Jun Yamamoto, Mitsuhiro Watanabe, Kenji Hayashida, Hiroaki Mine, Kazuyoshi Sakamoto, Yoshinori Nishida, Hitoshi Tanaka

J. JSCE, Ser.B2 (Coastal Engineering)　B2-66　(1)　1291-1295　2010/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.1291 　

ISSN： 1884-2399

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In connection with a planning of fishing ground development in the exclusive economic zone around Hokkaido, the authors observed currents, water quality, plankton and the primary productivity in the area surrounding the Musashi Bank in August in 2009. As a result, the primary production rate of summer of this sea area was estimated to be about 36.6 (mg-C/m²/day). It is quite lower than that of other bay area in Japan. The density stratification was observed and it suggests that Tsushima Warm Current along the Hokkaido coast influences the height of the layer. Depth in which it meets the requirement of the photosynthesis is 25-55m. It accounts for about 66% of the primary production of the entire water column here. It was confirmed that the lack of the nutrient salt on the surface limited the primary production of this sea area in summer.
Estimation method of discharge through the mouth of Lake Jusan for Assessment of the Brackish Environment Peer-reviewed

Atas Pracoyo, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki

J. JSCE, Ser.B2 (Coastal Engineering)　B2-66　(1)　981-985　2010/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.981 　

ISSN： 1884-2399

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Mixing ratio of saline water and freshwater is crucial in estuaries. The salinity flux into a brackish lake particularly has high influences on the environment and ecosystem in the lake. In this paper, we propose a method of estimation of discharge through the tidal inlet of Lake Jusan, considering not only the water balance but also kinematic conditions in the lake. Our method gives more accurate estimation on discharge fluctuation caused by tidal changes, and is also capable of simulating salinity flux into the lake properly. Both of them are very important on assessing water quality and ecological factors in estuaries. The results from this method are not affected by topographical change around the tidal inlet, which is one of the advantages of the proposed method.
Comparative study of depth of closure in the vicinity of coastal structures Peer-reviewed

Widyaningtias, Hitoshi Tanaka

Proceedings of International Sessions of Coastal Engineering Conference　1　21-25　2010/11
The influence of Chilean Tsunami wave in 2010 on rivers in the Tohoku District, Japan Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka

Proceedings of International Sessions of Coastal Engineering Conference　1　56-60　2010/11

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Nguyen Xuan Tinh, Hitoshi Tanaka
Bottom boundary layer beneath long waves Invited Peer-reviewed

Hitoshi Tanaka, Mohammad, Bagus Adityawan

Proceedings of 2nd International Conference on Coastal Zones and Engineering (Arabian Coast)　1-10　2010/11
Laboratory study on storm impacts to a sandy beach Peer-reviewed

Xuan Tinh Nguyen, Hitoshi Tanaka

Proceedings of 2nd International Conference on Coastal Zones and Engineering (Arabian Coast 2010) (CD-ROM)　2010/11
Analysis of phytoplankton behavior and material cycle in Miharu reservoir Peer-reviewed

Makoto Umeda, Mitsuhiko Shibata, Ken Ushijima, Hitoshi Tanaka

Environmental Engineering Research　47　175-183　2010/11
Sediment deposited due to storms and the analytical model Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka

Proceedings of 12th International Summer Symposium　139-142　2010/09/18
Investigation of density current from northern shallow area in Lake Inawashiro Peer-reviewed

Kazuki Aoyanag, Hitoshi Tanaka, Yutaka Fujita, Makoto Umeda, Susumu Kanayama

Proceedings of 11th International Summer Symposium　89-92　2010/09/18
Numerical simulation of lake water mixing due to strong wind in Lake Inawashiro Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka, Yutaka Fujita, Makoto Umeda, Susumu Kanayama

Journal of Applied Mechanics　13　701-708　2010/09/18
Study on detached breakwaters' effect on tsunami disaster mitigation by numerical wave flume Peer-reviewed

Minoru Hanzawa, Akira Matsumoto, Hitoshi Tanaka

Journal of Applied Mechanics　13　797-804　2010/09/02
Assessment of bottom stress under wave propagation and run-up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Journal of Applied Mechanics　13　813-820　2010/09/01
ESTIMATION OF DISCHARGE THROUGH TIDAL INLET OF LAKE JUSAN, JAPAN

Atas Proacoyo, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki

Japan - Indonesia Workshop on Estuary and Climate Change　2010/08
Monthly variation of wave setup height in a river entrance with sand spit development Peer-reviewed

Hitoshi Tanaka, Hanako Nakura, Xuan Tinh Nguyen

Proceedings of 32nd International Conference on Coastal Engineering　2010/07
Influence of tidal inlet depth on water level response and salinity intrusion in a lagoon Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of 32nd International Conference on Coastal Engineering　65　(1)　416-420　2010/07
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.65.416 　

ISSN： 1884-2399

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Nagatsura-ura Lagoon in Miyagi is a semi-enclosed water area that has been used for aquaculture of oyster for these forty years. Recently, however, death of oysters has frequently occurred due to anoxic water near the bottom, and is a big concern among stakeholders. Nagatsura-ura Lagoon and Oppa Bay are connected by shallow tidal inlet, and its water depth may greatly affect hydrodynamics and water environment in the lagoon. In this study, time variation of water level in the lagoon in response to tide is investigated through spectral analysis to quantify the role of water depth in the hydrodynamic process. Furthermore, the relationship between channel water depth and salinity concentration intruding into the lagoon is examined through 3-D numerical simulation.
Aerial photograph of Sendai Coast for shoreline behavior analysis Peer-reviewed

Eko Pradjoko, Hitoshi Tanaka

Proceedings of 32nd International Conference on Coastal Engineering　2010/07
Morphology variability in the vicinity of coastal structure Peer-reviewed

Sompratana Ritphring, Hitoshi Tanaka

Proceedings of 32nd International Conference on Coastal Engineering　2010/07
A new method for wave run up simulation by coupling k-w model with shallow water equation model Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Annual Journal of Civil Engineering in the Ocean　26　2010/06
Water quality monitoring and modeling in Lagoon Jusan, Japan Peer-reviewed

Makoto Umeda, Hitoshi Tanaka, Hatsune Higuchi, Mikio Sasaki

Proceedings of 6th International Symposium on Environmental Hydraulics (6th ISEH)　2010/06
Integration of k-w model into shallow water equation for numerical simulation of wave propagation and run up Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka

Proceedings of the 3rd International Tsunami Field Symposium -Science, Technology, and Disaster Mitigation-　2010/04
Two-equation turbulence modeling of an oscillatory boundary layer under steep pressure gradient Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

CANADIAN JOURNAL OF CIVIL ENGINEERING　37　(4)　648-656　2010/04

DOI： 10.1139/L10-009 　

ISSN： 0315-1468
Overwashed sediment into the Gamo Lagoon in Nanakita River mouth and effectiveness of the overwash prevention construction

Tohoku journal of natural disaster science　46　191-196　2010/03
Publisher:
数値シミュレーションを用いた閉鎖性水域における濁水移流拡散機構の解析

青柳一輝, 田中仁, 藤田豊, 梅田信

土木学会東北支部技術研究発表会　2010/03
準三次元モデルを用いた三春ダム貯水池の流動解析

柴田光彦, 梅田信, 田中仁

土木学会東北支部技術研究発表会　2010/03
Characteristics of current velocity in Mitoguchi channel, Lake Jusan

Atas Pracoyo, Maokto Umeda, Hitoshi Tanaka, Mikio Sasaki

土木学会東北支部技術研究発表会　2010/03
十三湖における水環境条件とヤマトシジミの個体数変動

石田行彦, 梅田信, 田中仁, 佐々木幹夫

土木学会東北支部技術研究発表会　2010/03
米代川における塩水遡上に関する研究

名倉華子, 田中仁, 梅田信

土木学会東北支部技術研究発表会　2010/03
Simulation of sediment scour in reservoir using Smoothed Particle Hydrodynamics (SPH) Method

Doung Hai Thuan, Makoto Umeda, Hitoshi Tanaka

土木学会東北支部技術研究発表会　2010/03
Study on advection diffusion process of turbidity from northern shallow area in Lake Inawashiro Invited Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka, Yutaka Fujita, Makoto Umeda, Susumu Kanayama

Annual Journal of Hydraulic Engineering, JSCE　54　1405-1410　2010/03
Spatio-temporal variations of salinity in a shallow lagoon Peer-reviewed

Makoto Umeda, Eriko Konishi, Hitoshi Tanaka, Mikio Sasaki

Annual Journal of Hydraulic Engineering, JSCE　54　1423-1428　2010/03
Proposal of generation method of bottom boundary layer under solitary wave Peer-reviewed

Bambang Winarta, Hitoshi Tanaka

Proceedings of 17th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research　2010/02
Motion of salt water in Iwaki River mouth Peer-reviewed

Mikio Sasaki, Hitoshi Tanaka, Makoto Umeda

Proceedings of 17th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research (CD-ROM)　2010/02
Influence of tidal inlet depth on water level response and salinity intrusion in a Lagoon

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　2010

ISSN： 0161-3782
Characteristics of backflow in Iwaki river mouth Peer-reviewed

Mikio Sasaki, Hitoshi Tanaka, Makoto Umeda

Advances in Geosciences: Volume 17: Hydrological Science (HS)　135-142　2010/01/01
Publisher: World Scientific Publishing Co.
DOI： 10.1142/7158-vol17 　
Monthly variation of wave set-up height in the Yoneshiro River mouth Peer-reviewed

Hitoshi Tanaka, Hanako Nakura, Nguyen Xuan Tinh

Proceedings of the Coastal Engineering Conference　2010

ISSN： 0161-3782
十三湖の水環境条件とヤマトシジミの生息状況

石田行彦, 梅田信, 田中仁, 佐々木幹夫

東北地域災害研究　46　173-178　2010
Publisher:
Measurement of vertical velocity distribution of velocity and salinity in mitoguchi channel, Lake Jusan

Atas Pracoyo, Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki

東北地域災害研究　46　209-214　2010
Publisher:
INVESTIGATION OF TURBULENT BOUNDARY LAYER CHARACTERISTIC UNDER OSCILLATORY WAVE Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Suntoyo

PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, VOL 4　365-+　2010
A PREDICTION FOR SAND BAR FORMATION AT THE MOUTH OF TAKASE FLOOD DIVERSION CHANNEL, JAPAN Peer-reviewed

Nguyen Trong Tu, Hitoshi Tanaka

PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, VOL 2　45-+　2010
Laboratory experiment on cross-shore barrier spit evolution by storm dynamics Peer-reviewed

Nguyen Xuan Tinh, Magnus Larson, Chantal Donnelly, Hitoshi Tanaka

Proceedings of the Coastal Engineering Conference　2010

ISSN： 0161-3782
Beach Morphological Change Caused by Wave Overtopping and Verification of Hard Structure to Prevent the Overwashing Peer-reviewed

HIRAO Ryutaro, NGUYEN-XUAN Tinh, TANAKA Hitoshi

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)　66　(1)　526-530　2010
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.66.526 　

ISSN： 1884-2399

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Rising of sea level together with the increase of wave height during a single extreme storm event might give storm waves more possibility to get over the beach crest and bring the sediment further inland direction especially at a low barrier island. Therefore, it is important to estimate the total amount of deposited sediment on a barrier island after storm and propose any suitable countermeasures to prevent the sand deposition into the bay or lagoon. From 8^th to 10^th of October 2009, an extreme typhoon number 18 attacked the Nanakita River mouth area and there was a lots of sediment deposited inland. This study is to analyze the deposited sediment and to evaluate the effectiveness of present overwash prevention construction in the Nanakita River mouth area by using the field observation data. The estimated sediment deposition shows well agreement with the result of empirical overwash formula.
Grid dependence of k-epsilon model for oscillatory boundary layers Peer-reviewed

A. R. Ghumman, A. Sana, H. Tanaka

PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-WATER MANAGEMENT　162　(6)　371-377　2009/12

DOI： 10.1680/wama.2009.162.6.371 　

ISSN： 1741-7589
Wave set-up and tidal discharge due to winter storm waves in river mouths facing the Sea of Japan Peer-reviewed

Eiki Yanata, Hitoshi Tanaka, Hanako Nakura, Makoto Umeda, Mikio Sasaki

Annual Journal of Coastal Egineering JSCE　56　(1)　391-395　2009/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.65.391 　

ISSN： 1884-2399

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It has been already reported by Nguyen et al.(2008) that at the river entrances facing the Sea of Japan, frequent occurrence of water level rise caused by wave set-up can be observed in storm waves during winter. It is hence expected that saline water intrusion is generated into the tidal estuary due to wave set-up, resulting in more frequent and more severe impact to the estuarine environment. In the present study, the additional amount of the sea water discharge caused by wave set-up is estimated from measured water level variation at the Iwakigawa and Yoneshiro river mouths in the northern part of Japan. Furthermore, theoretical expression is proposed to estimate the additional amount of sea water discharge expressed in terms of the deep water wave height and an empirical coefficient proposed Nguyen et al.(2008).
Frequent Monitoring and Numerical Modeling of Shoreline Change based on Automated Image Recording System Peer-reviewed

Kanji Mizoguchi, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　56　(1)　596-600　2009/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.65.596 　

ISSN： 1884-2399

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A monitoring method is applied to Yokosuka Coast in Miyagi Prefecture for understanding short-term topography change induced by wave action. Using images from an automated digital camera installed on the coast, shoreline position is determined after correcting the influence of wave run-up and tidal variation. Observed shoreline on the southern coast shows temporal variation in response to wave motion, whereas in the northern part of the study area, shoreline advancement is predominantly observed due to consistent recovery of the river mouth sand bar. Furthermore, a simple numerical modeling based on linear response function is applied to the present data set to reproduce the measured short-term shoreline variation.
Field Observation of Anoxic Water Behavior in the Destratification Process in Lake Notoro Peer-reviewed

Jun Yamamoto, Akinori Sako, Mitsuhiro Watanabe, Yoshimi Makita, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　56　(1)　966-970　2009/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.65.966 　

ISSN： 1884-2399

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Recently, the fishery damage by the anoxic water occurs in autumn in Lake Notoro. Field observation was carried out to examine the behavior of the anoxic water. The density stratification and the anoxic water at the bottom were observed in the middle of September, 2008. Then, the surface cooling and the north wind on September 19 were observed and the fishery damage was confirmed in the north of the lake the next day. Numerical study was done to clarify the behavior of the anoxic water. As a result, it was proven that the wind-driven current by the strong wind had brought windward upwelling of the anoxic water when the stratification period ended by cooling the surface.
Bottom Boundary Layer beneath Solitary Wave Motion Peer-reviewed

Mohammad Bagus Adityawan, Bambang Winarta, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　56　(1)　71-75　2009/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.65.71 　

ISSN： 1884-2399

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The Manning equation is commonly used in assessing the bed stress and also in modeling the wave propagation and run up. Nevertheless, this method might lead to an inaccurate estimation of the bed stress. In the present study, we will discuss the application of wave boundary layer in wave modeling. The free stream velocity at several cross sections is obtained from numerical simulation of solitary wave run up on a sloping beach. The wave propagation is calculated using the depth averaged equation with conventional Manning approach. The 1D vertical k-ω model will be used to assess the bed stress in wave propagation and run up. The velocity will be used as an input for the 1D model at the corresponding cross section.
Influence of Tidal Inlet Depth on Water Level Response and Salinity Intrusuion in a Lagoon Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka, Susumu Kanayama, Purwanto Bekti Santoso

Annual Journal of Coastal Egineering JSCE　56　(1)　416-420　2009/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/kaigan.65.416 　

ISSN： 1884-2399

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Nagatsura-ura Lagoon in Miyagi is a semi-enclosed water area that has been used for aquaculture of oyster for these forty years. Recently, however, death of oysters has frequently occurred due to anoxic water near the bottom, and is a big concern among stakeholders. Nagatsura-ura Lagoon and Oppa Bay are connected by shallow tidal inlet, and its water depth may greatly affect hydrodynamics and water environment in the lagoon. In this study, time variation of water level in the lagoon in response to tide is investigated through spectral analysis to quantify the role of water depth in the hydrodynamic process. Furthermore, the relationship between channel water depth and salinity concentration intruding into the lagoon is examined through 3-D numerical simulation.
Numerical modeling of boundary layer flows for a solitary wave Peer-reviewed

Suntoyo, Hitoshi Tanaka

JOURNAL OF HYDRO-ENVIRONMENT RESEARCH　3　(3)　129-137　2009/11

DOI： 10.1016/j.jher.2009.05.004 　

ISSN： 1570-6443
Rip current formation with runup interaction Peer-reviewed

Yessi Nirwana Kurniad, Hitoshi Tanaka

Proceedings of the 1st International Seminar on Sustainable Infrastructure and Built Environment in Developing Countries　2009/11
Morphological response to port construction on Sendai Coast Invited Peer-reviewed

Hitoshi Tanaka, Sompratana Ritphring, Eko Pradjoko

Proceedings of International Conference on Water Resources Engineering -50th Foundation Anniversary of Water Resources University-　2009/11
Salinity intrusion affected by wind and morphological change Peer-reviewed

Purwanto Bekti Santoso, Hitoshi Tanaka, Susumu Kanayama, Mitsuru Takasaki, HirotoYamaji

Proceedings of 3rd International Conference on Estuaries and Coasts　886-893　2009/09/14
Seawater quality in Gulf of Oman Peer-reviewed

Ahmad Sana, Abdullah Al-Yaqoubi, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　167-174　2009/09/14
Study on applicability of an ecosystem model in cold region enclosed sea Peer-reviewed

Jun Yamamoto, Mitsuhiro Watanabe, Shoji Yamashita, Kenji Hayashida, Hiroaki Mine, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　395-402　2009/09/14
Cross-shore barrier island profile changes due to the storm dynamics Peer-reviewed

Nguyen Xuan Tinh, Hitoshi Tanaka, Hiroto Yamaji, Dinh Quang Cuong

Proceedings of 3rd International Conference on Estuaries and Coasts　57-64　2009/09/14
Simulation of salinity intrusion into Nakdong River Estuary, South Korea using mathematical model Peer-reviewed

Do Hoon Kim, Sang Kil Park, Pham Ngoc Quy, Nguyen Trung Viet, Hitoshi Tanaka, Duong Hai Thuan

Proceedings of 3rd International Conference on Estuaries and Coasts　553-560　2009/09/14
Numerical simulation of diffusion process due to large-scale internal seiche in Lake Inawashiro Invited Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka, Yutaka Fujita, Makoto Umeda, Susumu Kanayama

Proceedings of 3rd International Conference on Estuaries and Coasts　233-240　2009/09/14
Characteristic of turbulent boundary layer under skew wave Peer-reviewed

Mohammad Bagus Adityawan, Hitoshi Tanaka, Suntoyo

Proceedings of 3rd International Conference on Estuaries and Coasts　281-288　2009/09/14
An estimation method of water depth at river mouths and its applicability Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　769-775　2009/09/14
Analysis of sand spit decline at the Natori River mouth using highly frequent aerial photographs Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka, Patchanok Srivihok, Mikihoro Korai

Proceedings of 3rd International Conference on Estuaries and Coasts　225-232　2009/09/14
Field study on shoreline and vegetation changes around the northern area in Lake Inawashiro Peer-reviewed

Yutaka Fujita, Hitoshi Tanaka, Michimasa Nakamura

Proceedings of 3rd International Conference on Estuaries and Coasts　218-224　2009/09/14
Seasonal characteristics of wave setup height in the Yoneshiro River mouth Peer-reviewed

Hanako Nakura, Hitoshi Tanaka, Nguyen Xuan Tinh, Makoto Umeda

Proceedings of 3rd International Conference on Estuaries and Coasts　257-264　2009/09/14
Observations on the motion of salt water in Iwaki River mouth Peer-reviewed

Mikio Sasaki, Kazunobu Asari, Yutaro Shoji, Hitoshi Tanaka, Makoto Umeda

Proceedings of 3rd International Conference on Estuaries and Coasts　449-456　2009/09/14
Study on estuary blockage and its appropriate excavation condition of the Natsui River mouth Peer-reviewed

Hisao Nagabayashi, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　527-534　2009/09/14
Comparative study of topography variability in the vicinity of coastal structure Peer-reviewed

Sompratana Ritpring, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　535-541　2009/09/14
Generation method improvement of bottom boundary layer under solitary wave Peer-reviewed

Bambang Winarta, Hitoshi Tanaka, Suntoyo

Proceedings of 3rd International Conference on Estuaries and Coasts　297-304　2009/09/14
Flow characteristic in Lake Jusan during small flood Peer-reviewed

Atas Pracoyo, Makoto Umeda, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　465-471　2009/09/14
Shoreline behavior around the Nanakita River mouth, Japan Peer-reviewed

Eko Pradjoko, Hitoshi Tanaka

Proceedings of 3rd International Conference on Estuaries and Coasts　273-280　2009/09/14
Field observation of infiltration flow through a river mouth bar Peer-reviewed

Hitoshi Tanaka, Kazuki Aoyanagi, Hiroto Yamaji, Takahiro Morita

Proceedings of 3rd International Conference on Estuaries and Coasts　305-311　2009/09/14
Effect of bed roughness on turbulent boundary layer and net sediment transport under asymmetric waves Peer-reviewed

Suntoyo, Hitoshi Tanaka

COASTAL ENGINEERING　56　(9)　960-969　2009/09

DOI： 10.1016/j.coastaleng.2009.06.005 　

ISSN： 0378-3839

eISSN： 1872-7379
Numerical simulation of lake mixture caused by internal seiche Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka, Makoto Umeda, Yutaka Fujita, Susumu Kanayama

Journal of Applied Mechanics　11　823-830　2009/09/01
Publisher:
ISSN： 1345-9139
Estuarine Hydro- and Morpho-Dynamics and Global Climate Change Invited Peer-reviewed

Hitoshi Tanaka

The 45th Summer Seminar on Hydraulics, JSCE (2009)　A-5-1-A-5-20　2009/08
Developing a hybrid multi-model for peak flood forecasting Peer-reviewed

Yupa Chidthong, Hitoshi Tanaka, Seree Supharatid

HYDROLOGICAL PROCESSES　23　(12)　1725-1738　2009/06

DOI： 10.1002/hyp.7307 　

ISSN： 0885-6087
十三湖の水質環境に関する現地観測

樋口初音, 梅田信, 田中仁, 佐々木幹夫

東北地域災害科学研究　45　129-134　2009/03
Publisher:
Wave setup due to the extreme events at different river mouth morphologies in Japan Peer-reviewed

Xuan-Tinh Nguyen, Hitoshi Tanaka, Makoto Umeda, Mikio Sasaki, Hisao Nagabayashi

Annual Journal of Hydraulic Engineering　53　199-204　2009/03
Effect of flood otlet operation of a dam on behavior of suspended sediment in the reservoir Peer-reviewed

Mitsuhiko Shibata, Makoto Umeda, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　53　1315-1320　2009/03
SIMULATION OF SALINITY INTRUSION INTO NANAKITA RIVER, JAPAN, TAKING INTO ACCOUNT EFFECTS OF MORPHOLOGICAL CHANGES AND WAVE SET-UP Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka

ADVANCES IN WATER RESOURCES AND HYDRAULIC ENGINEERING, VOLS 1-6　1401-1406　2009
TURBULENCE MODELING OF A WAVE BOUNDARY LAYER ON A ROUGH BOTTOM Peer-reviewed

Ahmad Sana, Hitoshi Tanaka, Suntoyo

COASTAL ENGINEERING 2008, VOLS 1-5　1572-+　2009
WAVE SETUP AT DIFFERENT RIVER ENTRANCE MORPHOLOGIES Peer-reviewed

Hitoshi Tanaka, Xuan-Tinh Nguyen, Hisao Nagabayashi

COASTAL ENGINEERING 2008, VOLS 1-5　975-+　2009
A NEW EMPIRICAL FORMULA FOR COASTAL WASHOVER SEDIMENT VOLUME Peer-reviewed

Xuan-Tinh Nguyen, Chantal Donnelly, Hitoshi Tanaka, Magnus Larson

COASTAL ENGINEERING 2008, VOLS 1-5　1736-+　2009
MORPHODYNAMICS AT RIVER MOUTH; MU RIVER MOUTH, JAPAN Peer-reviewed

Kentaro Hayashi, Takehito Horie, Yugo Imazu, Hideo Hiramori, Takashi Kikuchi, Hitoshi Tanaka

COASTAL ENGINEERING 2008, VOLS 1-5　2268-+　2009
PLANNING METHODOLOGY OF DESTRATIFICATION SYSTEM IN A RESERVOIR AGAINST ALGAL BLOOM Peer-reviewed

M. Umeda, S. Furuya, H. Tanaka

ADVANCES IN WATER RESOURCES AND HYDRAULIC ENGINEERING, VOLS 1-6　441-+　2009
Modeling of a Rough-Wall Oscillatory Boundary Layer Using Two-Equation Turbulence Models Peer-reviewed

Ahmad Sana, Abdul-Razzaq Ghumman, Hitoshi Tanaka

JOURNAL OF HYDRAULIC ENGINEERING-ASCE　135　(1)　60-65　2009/01

DOI： 10.1061/(ASCE)0733-9429(2009)135:1(60) 　

ISSN： 0733-9429
Characteristics of turbulent boundary layers over a rough bed under saw-tooth waves and its application to sediment transport Peer-reviewed

Suntoyo, Hitoshi Tanaka, Ahmad Sana

COASTAL ENGINEERING　55　(12)　1102-1112　2008/12

DOI： 10.1016/j.coastaleng.2008.04.007 　

ISSN： 0378-3839

eISSN： 1872-7379
Study on Mechanism of Beach Erosion on Yokosuka Coast Peer-reviewed

Kumiko Hongo, Hitoshi Tanaka, Shigeyuki Masuya, Toshimitsu Takagi, Takao Sasaki

Annual Journal of Coastal Egineering JSCE　55　691-695　2008/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.691 　

ISSN： 0916-7897

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Yokosuka Coast in Miyagi Prefecture is 2km long sandy coast, bounded by the Kitakami River mouth and Nagatsura-Ura tidal inlet. The coast had been stable more than several decades, and had been utilized as a public bathing beach by local people. In recent years, however, very severe erosion occurred along the coast. In this study, mechanism of recent erosion of Yokosuka Coast is investigated by analyzing long-term topographical maps as well as aerial photographs. The main conclusion in the present study is that the sediment transported to the mouth of Kitami River has been flushed during a big flood in 2002, large amount of which deposited in deep sea area and can not move back to shallow area to form the sandy coast.
Application of Field Data in Linear Response Model of Shoreline Variation Peer-reviewed

Truong Thien Khang, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　55　486-490　2008/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.486 　

ISSN： 0916-7897

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There are many kinds of model for predicting shoreline variation nowadays, which can be divided into two groups: process-based modeling (which is usually based on the sediment transport process and external forces) and another is mostly based on engineering computations which are not considered about the sophisticated or physically rigorous sediment transport process. One of the advantages of these models is short computing time due to not consider about sediment transport process. However, determination of empirical coefficients is the problems of these models. In this study, by applying long-term high-frequency field data on Sendai Coast with analytical analysis, a model for predicting the response of shoreline has been developed and verified.
Field Observations for Development of the Ecosystem Model in Cold Region Enclosed Sea Peer-reviewed

Jun Yamamoto, Kenji Hayashida, Hiroaki Mine, Yoshimi Makita, Shoji Yamashita, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　55　1196-1200　2008/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.1196 　

ISSN： 0916-7897

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The purpose of this study was to estimate biological parameters for the ecosystem model especially in cold region estuary. Because the phytoplankton is primary producer in the ecosystem, it is necessary to measure the growth to the accuracy of the ecosystem calculation. Field investigations including Phytoplankton's incubation experiment were conducted at Lake Furen in Hokkaido. From the experiment, we had an equation showing the relation between light-photosynthesis of cold region phytoplankton. The maximum photosynthetic rate and optimum light intensity were 3.3 (1/day) and 34.0 (W/m²) respectively at 17.8°C. They indicate that the phytoplankton grows up in conditions of low temperature and a little quantity of light, compared with the general parameters used in Japan.
Spatio-temporal fluctuation of salinity and dissolved oxygen in Lake Jusan Peer-reviewed

Makoto Umeda, Hitoshi Tanaka, Eriko Konishi, Mikio Sasaki

Annual Journal of Coastal Egineering JSCE　55　1051-1055　2008/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.1051 　

ISSN： 0916-7897

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This paper presents salinity and dissolved oxygen (DO) variations in the brackish lake, Lake Jusan, Japan, investigated through field measurements and simulation. During 2007 summer, auto-recoding salinity-temperature meters and DO meters were installed at five stations in the lake. The mean retention time of the lake water estimated from inflow river discharge is about three days, so that large fluctuations of salinity were observed in the entire lake, and low DO conditions were observed during mid-summer in spite of the rapid exchange of lake water. Numerical simulation in terms of salinity and DO was conducted using a vertical 1-dimensional model. The result of this simulation revealed that oxygen was consumed in the mid-layer of the lake due to drought river water inflow during the summer.
Long- and Short-term Trends of Shoreline Position Change near the New Mouth of the Omono Peer-reviewed

Hideo Matsutomi, Yohei Kondo, Taichi Kimura, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　55　636-640　2008/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.636 　

ISSN： 0916-7897

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Long-termt rendo f shorelinep ositionc hangen ear the new moutho f the Omonop ouringi nto the sea of Akita Southern Coast is discussed by using old map, topographicaml aps, field data collected in the last fifteeny ears and by examining accuracy of the old map (Inoul arge-scalem ap). Short-termt rend of shorelinep osition change on the same coast is also discussed to judge whethera remarkabler eceding of shorelinep ositiona t the Hamada-hamab athingp lace located near the mouth in July 2006 is a rare case. Through these discussions, it is concluded that 1) the shoreline position had basi cally advanced from 1800 to around 1900, and then it has gradually receded undulating and 2) the remarkable receding in July 2006 is not a rare case from the viewpoint of absolute shoreline position change
Numerical approach for the effect of the morphological change and wave set-up on salinity intrusion in the Nanakira River, Japan Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka

Proceedings of the 16th Congress of APD-IAHR and International Symposium on Hydraulic Structures　1401-1406　2008/10
Infiltration flow through a sand spit at the mouth of Nanakita River Peer-reviewed

Hitoshi Tanaka, Kazuki Aoyanagi, Toru Nemoto, Hiroto Yamaji

Proceedings of the 16th Congress of APD-IAHR and International Symposium on Hydraulic Structures　1250-1254　2008/10
Numerical Simulation and Its Visualization of Large-Scale Seiche in Lake Inawashiro Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka

Proceedings of 8th International Conference on Hydro-science and Engineering　2008/09
Generation Method of Bottom Boundary Layer Flow Induced by Solitary Wave Peer-reviewed

Hiroto Yamaji, Hitoshi Tanaka, Suntoyo, So Tanaka

Journal of Applied Mechanics　10　835-842　2008/09

DOI： 10.2208/journalam.11.835 　
Boundary layer flow and bed shear stress over smooth bed under solitary wave Peer-reviewed

Hiroto Yamaji, Suntoyo, Hitoshi Tanaka

Proceedings of 10th International Summer Symposium　57-60　2008/09
Field measurements on brackish water environment in Lake Jusan, Japan

Makoto Umeda, Hitoshi Tanaka, Mikio Sasaki

Japan-Thailand Estuary Workshop 2008　2008/08
Field investigation of disaster in Sri Lankan rivers caused by the 2004 Indian Ocean Tsunami Invited Peer-reviewed

Hitoshi Tanaka, Kazuo Ishino, Bandara Nawarathna, Hajime Nakagawa, Shin-ichiro Yano, Hiroyasu Yasuda, Yasuharu Watanabe, Kazuyoshi Hasegawa

Journal Hydroscience and Hydraulic Engineering　26　(1)　91-112　2008/06
十三湖の汽水環境に関する現地調査

梅田信, 田中仁, 佐々木幹夫

東北地域災害科学研究　44　163-168　2008/03
Publisher:
猪苗代湖における水理特性に関する研究

青柳一輝, 田中仁, 藤田豊, 梅田信

東北地域災害科学研究　44　157-162　2008/03
Publisher:
十三湖遡上塩水の現地観測

明石琢真, 佐々木幹夫, 田中仁, 梅田信

東北地域災害科学研究　44　175-180　2008/03
Publisher:
曝気循環施設の設置されている貯水池内の植物プランクトン予測モデルに関する研究

古屋哲志, 梅田信, 田中仁

平成19年度土木学会東北支部技術研究発表会講演概要集　2008/03
十三湖における塩分・水質挙動に関する現地観測

楠原諭, 梅田信, 田中仁, 佐々木幹夫

平成19年度土木学会東北支部技術研究発表会講演概要集　2008/03
貯水池における濁質の沈降・拡散についての数値解析

柴田光彦, 梅田信, 田中仁

平成19年度土木学会東北支部技術研究発表会講演概要集　2008/03
現地観測による猪苗代湖の水理現象に関する研究

青柳一輝, 田中仁, 藤田豊, 梅田信

平成19年度土木学会東北支部技術研究発表会講演概要集　2008/03
浅い汽水湖である青森県十三湖における水質変動解析

小西絵里子, 梅田信, 田中仁, 佐々木幹夫

平成19年度土木学会東北支部技術研究発表会講演概要集　2008/03
2007 年の十三湖水戸口における塩水遡上特性

成田泰葉, 佐々木幹夫, 田中仁, 梅田信

平成19年度土木学会東北支部技術研究発表会講演概要集　44　169-174　2008/03
Publisher:
十三湖遡上塩水の現地観―進入塩水の挙動― Invited Peer-reviewed

明石琢真, 佐々木幹夫, 田中仁, 梅田信

平成19年度土木学会東北支部技術研究発表会講演概要集　2008/03
Planning methodology of destratification system in a reservoir against algal bloom Peer-reviewed

Satoshi Furuya, Makoto Umeda, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering, JSCE　52　1285-1290　2008/03

DOI： 10.2208/prohe.52.1285 　
Winter Wave Setup at River Mouths Facing the Sea of Japan Peer-reviewed

NGUYEN Xuan Tinh, TANAKA Hitoshi, UMEDA Makoto, SASAKI Mikio

PROCEEDINGS OF COASTAL ENGINEERING, JSCE　55　(55)　366-370　2008
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.366 　

ISSN： 0916-7897

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Empirical studies on wave setup at river mouths are important in terms of river mouth morphology change, navigation transportation, saline intrusion into river and water environment. The main objective of this study is to investigate the influence of water depth at the entrance to wave setup height at Iwaki as well as Yoneshiro Rivers facing the Sea of Japan, with especial reference to differences from rivers facing the Pacific Ocean. Frequent occurrence of wave set-up can be observed in these two river entrances due to storm waves during winter. By combining the results of the present and previous studies of Nguyen et al.(2007), a technical diagram is proposed as a relationship between wave setup height with offshore wave height and average water depth at river entrance.
Verification of New Washover Formula with Field Measurements Data Peer-reviewed

NGUYEN Xuan Tinh, TANAKA Hitoshi, DONNELLY Chantal, LARSON Magnus

PROCEEDINGS OF COASTAL ENGINEERING, JSCE　55　(55)　476-480　2008
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.55.476 　

ISSN： 0916-7897

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Prediction of overwash occurrence can provide valuable planning information for local authorities, emergency services, and coastal residents. Based on those proposes a new empirical formula for predicting deposited washover volume was derived. The new formula was developed by modifying the assumptions of previous empirical models using new assump-tions based on the governing physical processes by taking into account the excess runup height over the beach crest and the duration of the overwash event. The empirical coefficient was calibrated using field data sets from United States. Verification of the model with a further fourteen field data sets was shown that the formula yields predictions are comparable to the measured field data with most of predicted overwash volumes falling within a factor of two.
Rip current modeling with runup interaction Peer-reviewed

Yessi Nirwana Kurniad, Hitoshi Tanaka

Proceedings of the 3rd Asian-Pacific Congress on Computational Mechanics and the 11th International Conference on the Enhancement and Promotion of Computational Methods in Engineering and Science　2007/12
Relationship between Lake Hydrodynamics and Water Quality in Songkhla Aquaculture Farm, Thailand Peer-reviewed

Hitoshi Tanaka, Nguyen Trung Viet, Hiroto Yamaji, Mitsuru Takasaki, Somboon Pornpinatepong, Kunlayanee Pornpinatepong

Annual Journal of Coastal Egineering JSCE　54　1391-1395　2007/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.1391 　

ISSN： 0916-7897

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Songkhla Lake is located in the Southern part of Thailand, connected with the Gulf of Thailand through a narrow channel. In the southernmost lake, Thale Sap Songkhla, aquaculture of sea bass plays an important role in the area's economy. In recent years, however, there have frequently been sudden deaths of fishes which may be due to the significant change in water quality in this lake. In-situ investigation has been carried to thoroughly clarify the mechanism of the changes of water quality parameters in Songkhla Lake. In this field investigation, automated water quality measuring instruments are installed in an aquaculture area to obtain time variation of current, dissolved oxygen (DO), salinity and temperature. In addition to investigate the water quality changes in the lake, an artificial neural network (ANN) model is applied to evaluate the mechanism of DO concentration in the Songkhla Lake.
A Model for Predicting Shoreline Change by Applying Linear Response Function Peer-reviewed

Truong Thien Khang, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　54　621-625　2007/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.621 　

ISSN： 0916-7897

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When predicting shoreline changes, process-based modeling, which is usually based on the sediment transport process and external forces, is usually applied. Nevertheless, some models which based on the effect of wave and deposit conditions to shoreline changes are also proposed. One of the advantages of these models is short computing time due to not consider sediment transport process. However, lots of empirical coefficients are the problems of these models. In this study, by applying the convolution integral, a model for predicting the response of shoreline has been developed and based on long term survey data, the constant calibration as well as verification of this model has been examined.
Field Observations on Influences of Pollution Load from Upstream Farms in Lake Furen Peer-reviewed

Jun Yamamoto, Yoshimi MAkita, Shoji Yamashita, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　54　1006-1010　2007/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.1006 　

ISSN： 0916-7897

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Lake Furen is an enclosed estuary facing the Nemuro bay in the North-Western Pacific.The measure which prevents water pollution of Lake Furen by pollution load from upstream farm is considered.It is required to evaluate the effects of the measures against water pollution in advance.Field observation of water quality, sediment and currents was performed in 2006.It is found that nutrients in the inner part of the lake were high especially after rain and that in the mouth is low.They are strongly dependent on salinity. Although the exchange of seawater is helpful for maintaining the good water quality of the mouth area, the seawater does not reach the inner part of Lake Furen.It was proved by the numerical simulation.
Field Observation of Infiltration Flow in a Sand Spit at the Mouth of Nanakita River Peer-reviewed

Toru Nemoto, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　54　361-365　2007/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.361 　

ISSN： 0916-7897

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Development of sand spit can frequently be observed at river mouths in Japan due to predominant action of waves as compared with flushing by river discharge. Progress of river mouth closure may cause reduction in flow through a river opening, resulting in increase in infiltration flow through a sand spit at a river entrance. However, there have been quite few investigation on this type of flow, although there have been many on coastal aquifer. In the present study, results of field observation of infiltration flow in a sand spit at the mouth of Nanakita River are described. Comprehensive numerical simulation is also performed to investigate the effect of water level variation in the mouth on the strength of infiltration flow.
Numerical Study on Water Exchange Mechanism in Nagatsura-ura Lagoon Peer-reviewed

Purwanto Bekti Santoso, Hitoshi Tanaka, Susumu Kanayama, Mitsuru Takasaki, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　54　1016-1020　2007/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.1016 　

ISSN： 0916-7897

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Nagatsura-ura Lagoon is a semi enclosed brackish water body actively used for aquaculture of oyster.In summer of recent years, however, deaths of oysters occur and are in deep concern among stakeholders of the aquaculture.Therefore, field observation was carried out to identify important physical characteristics in the lagoon.Some conclusionso n water exchange characteristich ave been drawn based on analysiso f the data obtained.Int his study, a simple Lagrangian tracer technique was used to further investigate the water exchange mechanism.Tracer's velocities were based on the flow field resulted from a calibrated three-dimensional hydrodynamic numerical model.Analyses were carried out through examination of behavior of single-tracer and multiple-tracers release
Estimation Method of Water Depth at the River Mouth and Limit of Application Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　54　366-370　2007/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.366 　

ISSN： 0916-7897

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Morphology of sand spit at a river mouth is affected by combined forces, such as tidal current, sea waves and river discharge, etc. Topographical change at a river mouth can beremarkable dependent on time-variation of these forces. However, in order to obtain frequent topography data at a river mouth, it is necessary to consume a great amount of time and cost, Thus, if it is possible to estimate river mouth topography information from water level variation data, it will be practically effective for river mouth management. However, river mouth characteristics diferent in each river. Therefore, it is necessary to clarify the river mouth characteristics. In this study, water depth estimation method is applied to field data at a river mouth. Moreover, the application limit of this method was discussed
Wave set-up at river and inlet entrances due to an extreme event Peer-reviewed

Nguyen Tinh Xuan, Hitoshi Tanaka

Proceedings of International Conference on Violent Flow 2007　2007/11
Experimental and numerical study on boundary layer under a solitary wave Peer-reviewed

Suntoyo, Hitoshi Tanaka, Ahmad Sana

Proceedings of International Conference on Violent Flow 2007　2007/11
Run-up interaction on rip current Peer-reviewed

Yessi Nirwana Kurniadi, Hitoshi Tanaka

Proceedings of International Conference on Violent Flow 2007　2007/11
Topographic variability via empirical orthogonal function analysis in the vicinity of coastal structure Peer-reviewed

Sompratana Ritphring, Hitoshi Tanaka

Proceedings of International Conference on Violent Flow 2007　2007/11
Field investigation of internal seiche in Lake Inawashiro Peer-reviewed

Kazuki Aoyanagi, Hitoshi Tanaka, Yutaka Fujita

Proceedings of International Conference on Violent Flow 2007　2007/11
Field study of flow and water quality change in Songkhla Lake, Thailand Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka, Mitsuru Takasaki, Hiroto Yamaji, Somboon Pornpinatepong, Kunlayanee Pornpinatepong

Proceedings of the 4th Asian and Pacific Coasts　2007/09
Study on bottom boundary layer under solitaryu wave motion Peer-reviewed

Eriko Konishi, Suntoyo, Hitoshi Tanaka, Hiroto Yamaji

Journal of Applied Mechanics JSCE　10　741-748　2007/09

DOI： 10.2208/journalam.10.741 　
A sediment transport study of rhythmical longshore pattern Peer-reviewed

Yessi Nirwana Kurniadi, Hitoshi Tanaka

Proceedings of 9th International Summer Symposium　9　143-146　2007/09
Topography change around Yuriage Port Peer-reviewed

Sompratana Ritphring, Hitoshi Tanaka

Proceedings of 9th International Summer Symposium　9　139-142　2007/09
Comparing different estimation methods of bottom shear stress for waves characterized by horizontal and vertical axes asymmetry Peer-reviewed

Suntoyo, Hitoshi Tanaka

Proceedings of 9th International Summer Symposium　9　111-114　2007/09
Full-range equation for wave boundary layer thickness Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

COASTAL ENGINEERING　54　(8)　639-642　2007/08

DOI： 10.1016/j.coastaleng.2007.01.011 　

ISSN： 0378-3839
Numerical simulation Nagatsura-ura Lagoon Peer-reviewed

Purwanto Bekti Santoso, Hitoshi Tanaka, Susumu Kanayama, Mitsuru Takasaki, Hiroto Yamaji

Proceedings of XXXII IAHR Congress (CD-ROM)　2007/07
Influence of floods and seawater exchange on water quality in Lake Furen, Japan Peer-reviewed

Jun Yamamoto, Y. Makita, Hitoshi Tanaka

Proceedings of 20th Annual Conference PACON　247-257　2007/06
Rainfall and flood forecasting by hybrid model (Case study: Koriyama City, Japan) Peer-reviewed

Yupa Chidtong, Seree Supharatid, Hitoshi Tanaka

Proceedings of 12th National Convention on Civil Engineering　2007/05
Water quality change at Ko Yo in Songkhla Lake Invited Peer-reviewed

Somboon Pornpinatepong, Hitoshi Tanaka, Mitsuru Takasaki, Hiroto Yamaji, Kunlayanee Pornpinatepong

Proceedings of 12th National Convention on Civil Engineering　2007/05
Evaluation of overwashed sediment volume after the 18[th] typhoon on 6[th] October 2006 in Yokosuka coast, Japan

Tohoku journal of natural disaster science　43　211-216　2007/03
Publisher:
Study on mechanism of sand bar intrusion Peer-reviewed

Ikuo Kawamura, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　51　625-630　2007/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.51.625 　

ISSN： 0916-7374

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The Naruse River mouth showed stable topography at least until 1996. However, sand bar on the left-hand side of the river mouth has been declining in recent years. The behavior of the morphology of the river mouth after the flushing of the sand bar has never been observed. In this paper, characteristic morphological change at the Naruse River mouth is shown with the use of aerial photographs and morphological maps. In order to determine the main factor of morphological change, numerical simulation of extended Boussinesq equations are applied. It is concluded that, the mechanism of the sand bar intrusion into the river is explained by wave overtopping over the left-hand side sand bar at the river mouth. Furthermore, sand bar height and width are important factors of sand bar intrusion.
Bridge damage research analysis of Sri Lankan southwest coastand future measures against tsunami waves Peer-reviewed

Kazuo Ishino, Bandara Nawarathna, Shin-ichiro Yano, Hajime Nakagawa, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　51　1457-1462　2007/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.51.1457 　

ISSN： 0916-7374

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The 2004 December Sumatra earthquake generated tsunami waves caused enormous damage in Sri Lanka. In order to investigate damaged situation due to tsunami propagation in rivers, the committee on Hydroscience and Hydraulic Engineering, Japan Society of Civil Engineers (JSCE) delegated its members as a field investigation team of JSCE. As Sri Lanka is locatedvery far from a possible large earthquake epicenter, influence of shaking earth can be only transferred bytsunami waves. In this paper, damaged situation of 34 bridges alone the southwest coast of the country are discussed. Analyzing the causes for bridge damages, we show the advanced design subjects for river bridges to withstand future tsunami waves.
Hydro- and morpho-dynamics at river entrances Invited Peer-reviewed

Hitoshi Tanaka

Annual Journal of HHydraulic Engineering　51　K-9-K-11　2007/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.51.K9 　

ISSN： 0916-7374

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A mathematical model for calculating river mouth morphology change is overviewed, in which longshore sediment intrusion into a mouth by waves, as well as sediment flushing out of a mouth by river and tidal discharge is considered. Behavior of an analytical solution is discussed for various combinations of opposing forces acting at a river mouth. For model verification, as well as for planning, management and serving as the information for the engineering projects in a river mouth area, in-situ monitoring of morphology changes is important and inevitable. Thus, recent monitoring method of river mouth morphology is also introduced, which enables us to make an accurate and frequent survey of river mouth. Furthermore, quantitative discussion will be made for wave set-up, water level rise due to wave breaking, in a river entrance.
Modification of the damping function in the k-epsilon model to analyse oscillatory boundary layers Peer-reviewed

Ahmad Sana, Abdul Razzaq Ghumman, Hitoshi Tanaka

OCEAN ENGINEERING　34　(2)　320-326　2007/02

DOI： 10.1016/j.oceaneng.2005.11.018 　

ISSN： 0029-8018
In-situ investigation and simulation of water quality changes in Songkhla Lake, Thailand Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka, Mitsuru Takasaki, Hiroto Yamaji, Somboon Pornpinatepong, Kunlayanee Pornpinatepong

ASIAN AND PACIFIC COASTS 2007　823-826　2007
STUDY ON WATER EXCHANGE DUE TO INTERNAL TIDES AND ANOXIC WATER FORMATION BY AUTUMN SLACK WATER IN NOMI BAY, JAPAN Invited Peer-reviewed

Jun Yamamoto, Hitoshi Tanaka, Sin-ya Saeki

JSCE JOURNAL OF HYDRAULIC, COASTAL AND ENVIRONMENTAL ENGINEERING　63　(1)　39-50　2007/01
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejb.63.39 　

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Internal tides were observed during summer in Nomi Bay in Kochi Prefecture, Japan, where extensive aquaculture has been carried out, and DO was sufficiently high even at the bottom. Meanwhile, slack water and anoxic water formation were observed during autumn. It is generally well known that anoxic water forms in summer due to strong stratification in vertical direction and it disappears in autumn. Contrary to this general expectation, however, the water quality in Nomi Bay was worse in autumn than that in summer. Thus, the effect of the internal tide is quantitatively investigated using a numerical model. It is concluded that internal tides enhance the exchange of seawater, being helpful for maintaining the good water quality of the inner area in Nomi Bay.
Coastal and River mouth morphology change in sri lanka due to the 2004 indian ocean tsunami Peer-reviewed

Hitoshi Tanaka, Kazuo Ishino, Bandara Nawarathna, Hajime Nakagawa, Shinichiro Yano

Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes　842-855　2007

DOI： 10.1061/40926(239)64 　
Effects of a River Mouth Terrace to Longshore Sediment Transport Peer-reviewed

T. K. Truong, H. Tanaka

JOURNAL OF COASTAL RESEARCH　Special Issue 50　874-878　2007

ISSN： 0749-0208
Study on the Effect of Morphology Change on Salinity Distribution in the Dinh An Estuary, Lower Mekong River of Vietnam Peer-reviewed

T. V. Nguyen, H. Tanaka

JOURNAL OF COASTAL RESEARCH　Special Issue 50　268-272　2007

ISSN： 0749-0208
Analysis of topographic change in the vicinity of coastal structure using empirical orthogonal function Peer-reviewed

Sompratana Ritphring, Hitoshi Tanaka

ASIAN AND PACIFIC COASTS 2007　447-450　2007
Sand bar development after flushing at the Natori River mouth Peer-reviewed

Tu Trong Nguyen, Kazuya Watanabe, Hitoshi Tanaka

ASIAN AND PACIFIC COASTS 2007　541-544　2007
Numerical study on boundary layer flows under solitary wave Peer-reviewed

Suntoyo, Hitoshi Tanaka

ASIAN AND PACIFIC COASTS 2007　207-210　2007
Non dimensional relationship for investigating cusps spacing Peer-reviewed

Yessi Nirwana Kurniadi, Hitoshi Tanaka

ASIAN AND PACIFIC COASTS 2007　525-528　2007
Beach Morphology Change Caused by Overwash on Yokosuka Coast Peer-reviewed

NGUYEN Xuan Tinh, TANAKA Hitoshi

PROCEEDINGS OF COASTAL ENGINEERING, JSCE　54　(54)　681-685　2007
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.681 　

ISSN： 0916-7897

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At the beginning of October 2006, an extreme Typhoon 18th hit Yokosuka coast of Japan. There is a big amount of sediment transported and deposited inland after the typhoon. This study is to evaluate of this overwashed sediment volume and the prediction of overwash occurrence. These estimation are significant for coastal authorities and local managers to give evacuation warnings to people who live near the coast, it is useful for planners and engineers to mobilise equipment for cleaning up sediment after a storm. Profile change estimations are useful for planners creating “buffer zones” indicating where it is safe to build houses. And this calculation is also important for evaluating sediment budgets of sand beach or barrier islands, especially where these sand beach or islands are migrating due to overwash.
Wave Setup at River and Inlet Entrances during the Low Pressure System in 2006 Peer-reviewed

NGUYEN Xuan Tinh, TANAKA Hitoshi, NAGABAYASHI Hisao

PROCEEDINGS OF COASTAL ENGINEERING, JSCE　54　(54)　321-325　2007
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.54.321 　

ISSN： 0916-7897

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The interaction between ocean and river is very complicated topic since this area contains a lot of different processes. Of which the wave setup at a river entrance or tidal inlet due to an extreme event such as low pressure system and typhoon is a big concerning issue nowadays in terms of river mouth morphology change, saline intrusion, and navigation transportation. The main purposes of this study are to in-depth investigating the wave set-up at different morphological river entrances or tidal inlets based on collected data sets from 8 river entrances. Wave setup height is inversely proportional to water depth at river entrance. The more water depthis, the less wave setup will be obtained. Wave setup height was attained to from 10 to 15 percent of offshore wave height for the cases of narrow and shallow river or inlet mouth, and from 2 to 4 percent of offshore wave height for a deep and wide river.
Influence of field data frequencey on calibration result of one-line model Peer-reviewed

Hyun-woo Kang, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　53　556-560　2006/11
Publisher:
DOI： 10.2208/proce1989.53.556 　

ISSN： 0916-7897
Influence of river mouth morphology and wave set-up height on salinity concentration in an estuary Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　53　936-940　2006/11
Publisher:
DOI： 10.2208/proce1989.53.936 　

ISSN： 0916-7897
Salinity intrusion and DO variation in the Nagatsura-ura Lagoon Peer-reviewed

Manabu Kanesato, Purwanto Bekti Santoso, Hitoshi Tanaka, Susumu Kanayama, Mutsuru Takasaki, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　53　931-935　2006/11
Publisher:
DOI： 10.2208/proce1989.53.931 　

ISSN： 0916-7897
Observation of river mouth morphology change using an image data and its modeling Peer-reviewed

Daisuke Nakayama, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Coastal Egineering JSCE　53　581-585　2006/11
Publisher:
DOI： 10.2208/proce1989.53.581 　

ISSN： 0916-7897
Influence of river mouth sand terrace on the continuity of littoral system Peer-reviewed

Truong Thien Khang, Hitoshi Tanaka

Annual Journal of Coastal Egineering JSCE　53　616-620　2006/11
Publisher:
DOI： 10.2208/proce1989.53.616 　

ISSN： 0916-7897
Monitoring and modeling of short-term morphology change at a river entrance Invited Peer-reviewed

Hitoshi Tanaka, Nguyen Trung Viet

Proceedings of 2nd International Symposium on Estuary and Coast　95-102　2006/11
Transport mechanism in Nagatsura-ura Lagoon Peer-reviewed

Purwanto Bekti Santoso, Hitoshi Tanaka, Susumu Kanayama, Mitsuru Takasaki, Hiroto Yamaji

Proceedings of 2nd International Symposium on Estuary and Coast　615-622　2006/11
Characteristics of nutrient flux between Oppa Bay and Nagatsura-ura Lagoon on Southern Sanriku Coast, Japan Peer-reviewed

Mitsuru Takasaki, Takuya Aota, Hitoshi Tanaka

Proceedings of 2nd International Symposium on Estuary and Coast　730-738　2006/11
River mouth morphology change of Natusi River and effectiveness of exacavation Peer-reviewed

Hisao Nagabayashi, Hitoshi Tanaki, Magnus Larson

Annual Journal of Coastal Engineering　53　606-610　2006/11
Publisher:
DOI： 10.2208/proce1989.53.606 　

ISSN： 0916-7897
Hydrodynamic behavior of asymmetric oscillatory boundary layers at low Reynolds numbers Peer-reviewed

Ahmad Sana, Hitoshi Tanaka, Hiroto Yamaji, Ikuo Kawamura

JOURNAL OF HYDRAULIC ENGINEERING-ASCE　132　(10)　1086-1096　2006/10

DOI： 10.1061/(ASCE)0733-9429(2006)132:10(1086) 　

ISSN： 0733-9429
Internal tides and autumn slack water in Nomi Bay, Japan Peer-reviewed

Jun Yamamoto, Hitoshi Tanaka

COASTAL ENGINEERING JOURNAL　48　(3)　257-278　2006/09

DOI： 10.1142/S0578563406001416 　

ISSN： 2166-4250

eISSN： 1793-6292
Internal tides and autumn slack water in Nomi Bay, Japan Peer-reviewed

Jun Yamamoto, Hitoshi Tanaka

Coastal Engineering Journal　48　(3)　257-278　2006/09

DOI： 10.1142/S0578563406001416 　

ISSN： 0578-5634
Application of old maps for studying long term shoreline change Peer-reviewed

Tanaka, H, Takahashi, G, Matsutomi, H, Izumi, N

Proceedings of 30th International Conference on Coastal Engineering　4022-4034　2006/09
Bottom shear stress and sediment transport calculation characterized by the acceleration effect under non-linear waves motion Peer-reviewed

Suntoyo, Hitoshi Tanaka, Ahmad Sana

Proceedings of 30th International Conference on Coastal Engineering　2308-2317　2006/09
Estimation of time-dependent wave set-up height in a river entrance Peer-reviewed

Hyun-Seok Lee, Hitoshi Tanaka

Proceedings of 30th International Conference on Coastal Engineering　972-984　2006/09
Response of sand bar at a jettied river entrance to perpendicular waves Peer-reviewed

Nguyen Trong Tu, Hitoshi Tanaka

Proceedings of 30th International Conference on Coastal Engineering　2737-2749　2006/09
Numerical investigation on a rough bed turbulent boundary layer under cnoidal wave motion Invited Peer-reviewed

Hitoshi Tanaka, Suntoyo, Ahmad Sana

Proceedings of 7th International Conference on Hydro-science and Engineering　2006/09
Field study of flow and water quality change in Songkhla Lake, Thailand Peer-reviewed

Hitoshi Tanaka, Mitsuru Takasaki, Hiroto Yamaji, Somboon Pornpinatepong, K. Pornpinatepong

Proceedings of the 15th Congress of APD-IAHR and International Symposium on Maritime Hydraulics　383-388　2006/08
Analysis of bathymetric change around Sendai Port Peer-reviewed

Sompratana Ritphring, Hitoshi Tanaka

Proceedings of the 15th Congress of APD-IAHR and International Symposium on Maritime Hydraulics　701-707　2006/08
Field observation of water temperature in the northern area of Lake Inawashiro Lake Peer-reviewed

Yutaka Fujita, Hitoshi Tanaka

Proceedings of the 15th Congress of APD-IAHR and International Symposium on Maritime Hydraulics　1409-1415　2006/08
Estimation of seasonal water depth variation using water level data at the Natori River mouth Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of the 15th Congress of APD-IAHR and International Symposium on Maritime Hydraulics　979-985　2006/08
Measurement of hydrodynamics and water quality parameters in Gulf of Oman Peer-reviewed

Ahmad Sana, A. Al-Jamrah, M. Clareboudt, Hitoshi Tanaka, A. Kwarteng

Proceedings of the 15th Congress of APD-IAHR and International Symposium on Maritime Hydraulics　1155-1165　2006/08
Evaluation of long-term shoreline change using old maps Peer-reviewed

Genki Takahashi, Hitoshi Tanaka, Hideo Matsutomi, Norihiro Izumi

Proceedings of Civil Engineering in the Ocean　31　451-456　2006/07
Publisher:
DOI： 10.2208/prooe.22.451 　

ISSN： 0912-7348
A field experiment of improving water quality by micro bubble aeration system in Uranouchi Bay, JAPAN Peer-reviewed

Jun Yamamoto, Sinya Saeki, Yuhei Adachi, Hitoshi

Annual Journal of Civil Engineering in the Ocean, JSCE　22　643-648　2006/06
Publisher:
DOI： 10.2208/prooe.22.643 　

ISSN： 0912-7348
Study on water level fluctuation due to wave set-up in a river mouth Peer-reviewed

Hitoshi Tanaka, Hyun-seok Lee

Journal of Hydraulic, Coastal and Environmental Engineering, JSCE　62　(2)　210-223　2006/06

DOI： 10.2208/jscejb.62.210 　
Field investigation of disasters in Sri Lankan rivers caused Sumatra Earthquake Tsunami Peer-reviewed

Hitoshi Tanaka, Hajime Nakagawa, Kazuo Ishino, Shinichiro Yano, Bandara Nawarathna, Hiroyasu Yasuda, Yasuharu Watanabe, Kazuyoshi Hasegawa

Annual Journal of Hydraulic Engineering, JSCE　50　577-582　2006/03

DOI： 10.2208/prohe.50.577 　
Anoxic water formation and water quality changes by western wind in Shizugawa Bay Peer-reviewed

Jun Yamamoto, Hitoshi Tanaka, Mitsuru Takasaki, Shinya Saeki

Annual Journal of Hydraulic Engineering, JSCE　50　1399-1404　2006/03

DOI： 10.2208/prohe.50.1399 　
Characteristics of turbulent boundary layer over a rough bed under cnoidal wave motion Peer-reviewed

Suntoyo, Hitoshi Tanaka, Ahmad Sana, Hiroto Yamaji

Annual Journal of Hydraulic Engineering, JSCE　50　121-126　2006/03

DOI： 10.2208/prohe.50.121 　
Effect of morphological changes and waves to salinity intrusion in the Nanakita River mouth Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka, Daisuke Nakayama, Hiroto Yamaji

Annual Journal of Hydraulic Engineering, JSCE　50　139-144　2006/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.50.139 　

ISSN： 0916-7374

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Salinity intrusion into estuaries, in general, is mostly affected by river water discharge and tidal level. In addition, the change of salinity can also be influenced by other external forces such as wave height, river mouth morphology. However, there has been none of the study considering this kind of aspect. In fact, the rapid change of river mouth morphology can strongly effect on salinity distribution. Hereby, we carried out the study at the Nanakita river mouth for considering the effect of morphology and wave height. One maneuver to escape the situation of lacking in morphology data is to use the digital camera for taking and collecting oblique photographs. Once this technique is utilized, the highly frequent morphological data can be obtained. These data are useful to the simulation of salinity intrusion into the river mouth with a short time interval. Furthermore, effectiveness of each external force also will be examined by sensitivity analysis .
Hydrodynamic stability of asymmetric oscillatory boundary layers

Hitoshi Tanaka

Journal of Hydraulic Engineering　2006
Application of 2-D vertically averaged boundary fitted coordinate model of tidal circulation in Thale Sap Songkhla, Thailand Peer-reviewed

Somboon Pornpinatepong, Hitoshi Tanaka, Mitsuru Takasaki

Walailak Journal of Science and Technology　3　(1)　105-118　2006
Prediction of instantaneous bottom shear stress for smooth turbulent bottom boundary layers under irregular waves Peer-reviewed

Hitoshi Tanaka, Mustafa Ataus Samad

JOURNAL OF HYDRAULIC RESEARCH　44　(1)　94-106　2006

DOI： 10.1080/00221686.2006.9521664 　

ISSN： 0022-1686
Coastal dynamics and shore erosion in Songkhla

Somboon Pornpinatepong, Hitoshi Tanaka, Thawat Chittrakarn

Proceedings of The Fourth PSU Engineering Conference　CE43-CE48　2005/12
Simulation of time series of salinity intrusion in the Hau River estuary, Vietnam

Nguyen Trung Viet, Hitoshi Tanaka, Toru Watanabe

Proceedings of 2nd International Symposium on Southeast the Development of Water Resources Management System in Mekong Watershed　62-68　2005/12
Field investigation of the flood disaster in south-west area of Sri Lanka occurred in May 2003 Invited Peer-reviewed

Toshimitsu Komatsu, Hitoshi Tanaka, Keiichi Toda, Yasuyuki Shimizu, Masaharu Fujita, Kazuo Ishino, So Kazama, Motoyuki Ushiyama, Y. Katsuhama, S. Herath, B. Nawarathna

Journal Hydroscience and Hydraulic Engineering　23　(2)　43-53　2005/12
Field observations of sand spit flushing and its recovery at the Natori River mouth Peer-reviewed

Kazuya Watanabe, Nguyen Trong Tu, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　52　586-590　2005/11

DOI： 10.2208/proce1989.52.586 　
Estimation of seasonal water depth variation at the Natori River mouth using water level data Peer-reviewed

Kazuya Watanabe, Jun-ichi Asayama, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of Coastal Engineering JSCE　52　336-340　2005/11
Publisher:
DOI： 10.2208/proce1989.52.336 　

ISSN： 0916-7897
Numerical modeling of shoreline change using artificial neural networks Peer-reviewed

Takeshi Sakaue, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　52　531-535　2005/11
Publisher:
DOI： 10.2208/proce1989.52.531 　

ISSN： 0916-7897
Bottom shear stress under cnoidal waves motion characterized by the acceleration effect and its applications Peer-reviewed

Suntoyo, Hotoshi Tanaka

Proceedings of Coastal Engineering JSCE　52　76-80　2005/11
Publisher:
DOI： 10.2208/proce1989.52.76 　

ISSN： 0916-7897
Sand bar development at a jettied river mouth Peer-reviewed

Nguyen Trong Tu, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of Coastal Engineering JSCE　52　581-585　2005/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.52.581 　

ISSN： 0916-7897
Beach erosion control on Ishinomaki Coast using headlands Peer-reviewed

Totu Takahashi, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　52　471-475　2005/11
Publisher:
DOI： 10.2208/proce1989.52.471 　

ISSN： 0916-7897
Flow characteristics in Nagatsura-Ura Lagoon Peer-reviewed

Purwanto Bekti Santoso, Manabu Kanesato, Susumu Kanayama, Hitoshi Tanaka, Mutsuru Takasaki, Hiroto Yamaji

Proceedings of Coastal Engineering JSCE　52　871-875　2005/11
Publisher:
DOI： 10.2208/proce1989.52.871 　

ISSN： 0916-7897
Analysis of sand spit decline at the Natori River mouth using highly frequent aerial photographs Peer-reviewed

Mikihiro Kourai, Hitoshi Tanaka, Kazuya Watanabe, Patchanok Srivihok

Proceedings of Coastal Engineering JSCE　52　591-595　2005/11
Publisher:
DOI： 10.2208/proce1989.52.591 　

ISSN： 0916-7897
Study of shoreline change on Sendai and Ishinomaki Coasts using historical maps Peer-reviewed

Hitoshi Tanaka, Hideo Matsutomi, Norihiro Izumi

Proceedings of Coastal Engineering JSCE　52　556-560　2005/11
Publisher:
DOI： 10.2208/proce1989.52.556 　

ISSN： 0916-7897
The formation of beach cusps by waves with their crests parallel to shorelines Peer-reviewed

Norihiro Izumi, Asako Tanikawa, Hitoshi Tanaka

Proceedings of 4th International Conference on River, Coastal and Estuary Morphodynamics　355-363　2005/10
Influence of cross-shore sediment movement on long-term shoreline change simulation Peer-reviewed

Hyun Woo Kang, Hitoshi Tanaka

Proceedings of 4th International Conference on River, Coastal and Estuary Morphodynamics　343-348　2005/10
In-situ investigation of water quality in the Hau River estuary Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka, Vo Khac Tri, Tang Duc Thang

Proceedings of the International Symposium on Sustainable Development in the Mekong River Basin　41-48　2005/10
Analysis of historical shoreline change on Sendai Coast Peer-reviewed

Hitoshi Tanaka, Hideo Matsutomi, Norihiro Izumi

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　677-686　2005/09
Study on seasonal variation of water depth at the Natori River mouth, Japan Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　1386-1395　2005/09
Study on shoreline change and sediment transport rate on Sendai Coast Peer-reviewed

Hyun Woo Kang, Hitoshi Tanaka

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　702-712　2005/09
Change in morphology and sediment budget in the vicinity of Ishinomaki Port Peer-reviewed

Toru Takahashi, Hitoshi Tanaka

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　931-942　2005/09
Interaction between river mouth morphology change and wave, tide and river flow Peer-reviewed

Patchanok Srivihok, Hitoshi Tanaka

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　1681-1694　2005/09
Recent decline of river mouth bars in Japan Peer-reviewed

Ikuo Kawamura, Hitoshi Tanaka

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　1705-1714　2005/09
Acceleration effect on bottom shear stress and sediment transport under skew waves Peer-reviewed

Suntoyo, Hitoshi Tanaka

Proceedings of 3rd Asian and Pacific Coastal Engineering Conference (CD-ROM)　135-149　2005/09
Laboratory study of sand bar development at a river entrance Peer-reviewed

Hitoshi Tanaka, Nguyen Trung Tu, Naohiro Wada

Proceedings of XXXI IAHR Congress　3778-3787　2005/09
Field observation of salinity intrusion into the Hau River estuary, Vietnam Peer-reviewed

Nguyen Trong Viet, Hitoshi Tanaka

Proceedings of 7th International Summer Symposium　137-140　2005/07
A classification of sand bar at river entrance Peer-reviewed

Nguyen Trung Tu, Hitoshi Tanaka

Proceedings of 7th International Summer Symposium　141-144　2005/07
Development of minitoring systems for morphology change at small- and middle-scale river mouths Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka, Daisuke Nakayama

Proceedings of River Hydraulics and Environment　11　351-356　2005/06
Mechanism of sand spit decline at the Naruse River mouth Peer-reviewed

Ikuo Kawamura, Hitoshi Tanaka

Proceedings of River Hydraulics and Environment　11　345-350　2005/06
Study on the mechanism of sand bar decline and intrusion at the Naruse River mouth Peer-reviewed

Ikuo Kawamura, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　49　1339-1344　2005/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.49.1339 　

ISSN： 0916-7374

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The Naruse River mouth showed stable topography at least for these 46 years. However, sand bar on the lefthand side of the river mouth has been declining in recent years. The behavior of the morphology of the river mouth after the flushing of the sand bar has never been observed. In this paper, characteristic morphological change at the Naruse River mouth is shown with the use of aerial photographs and morphological maps. In order to determine the main factor of morphological change, empirical orthogonal functions are applied. It is concluded that the decline of the sand bar has occurred by the construction of the headlands. Furthermore, the mechanism of the sand bar intrusion into the river is explained by wave overtopping over the left-hand side sand bar at the river mouth.
Field observation of water quality change in response to tidal variation in Nagatsura-Ura Lagoon Peer-reviewed

Manabu Kanesato, Hitoshi Tanaka, Mitsuru Takasaki, Hiroto Yamaji

Annual Journal of Hydraulic Engineering　49　1261-1266　2005/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.49.1261 　

ISSN： 0916-7374

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In semi-enclosed water areas, aquaculture has been performed actively in many places in Japan by utilizing their calm environment. In case of overproduction of culturing, however, aggravation of water quality environment, such as eutrophication and appearance of anoxic water, is inherent problem in semi-enclosed areas. Nagatura-ura Lagoon, the study area of the present study, is also one of the typical semi-enclosed brackish-water areas. Nagatsura-ura Lagoon has been used mostly for cultivating oyster for these several decades. In the recent years, however, the appearance of anoxic water causes severe damage to the fishery industry. In this study, filed observation has been carried out during summer of 2003. The salinity, water temperature, dissoloved oxygen and water level were measured in the study area. Through these measurements, the characteristics of water quality change in response to tidal variation were investigated to clarify the mechanism of sea water exchange in the lagoon area.
Field investigation of the flood disaster in south-west area of Srilanka ocurred in May 2003 Peer-reviewed

Toshimitsu Komatsu, Hitoshi Tanaka, Keiichi Toda, Yasuyuki Shumizu, Masaharu Fujita, Kazuo Ishino, So Kazama, Motoyuki Ushiyama, Yoshihiro Katsuhama, Srikantha Herath, Bandara Nawarathna

Annual Journal of Hydraulic Engineering　49　433-438　2005/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.49.433 　

ISSN： 0916-7374

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In the southwest of Sri Lanka, a heavy flood occurred on 17-18 May in 2003, which caused severe river inundations and landslides in a wide area. About 300 persons were killed, and houses, farm products and infrastructures were heavily damaged. In order to investigate this flood and sediment disaster from the hydrological and hydraulic aspects, the committee on Hydroscience and Hydraulic Engineering, Japan Society of Civil Engineers (JSCE) delegated its members whose major are hydrology, hydraulic engineering and river engineering as a flood investigation team by JSCE. In this paper, results of the field investigation are shown for three river basins in Sri Lanka that were severely damaged by flood and landslide disaster induced by the heavy rainfall.
A transport model of fine suspended particles considering the availability on the bed Peer-reviewed

Norihiro Izumi, Sitang Pilailar, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　49　907-912　2005/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.49.907 　

ISSN： 0916-7374

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The understanding of the transport process of suspended fine particles in rivers becomes important from a viewpoint of biological environment in rivers. In this study, we propose a new transport model of suspended fine particles in rivers considering the availability of fine sediment on the bed. An availability function of fine sediment on the bed is introduced to take into account the reduction of the entrainment rate through lack of fine sediment on the bed. In a sample calculation with the assumption that the flow is in the unsteady normal flow condition, it is shown that the model can delineate an important fact that the SS concentration increases only up to some limit even if the bed shear stress increases. In addition, we applied the model to a field observation and show that the model can describe an important feature that the SS concentration is higher at the begining of a flood and decreases afterward despite large discharge.
Hydro- and morpho-dynamics at river entrances Invited Peer-reviewed

Hitoshi Tanaka

Nagare　24　(1)　37-46　2005/02

DOI： 10.11426/nagare1982.24.37 　
Experimental and numerical study of irregular wave boundary layers on a rough bottom Peer-reviewed

A Sana, H Tanaka, T Suzuki

Coastal Engineering 2004, Vols 1-4　521-528　2005

DOI： 10.1142/9789812701916-0041 　
Short-term prediction of coastal recession around Sandwip island in the northern bay of Bengal, Bangladesh Peer-reviewed

MA Samad, H Tanaka

Coastal Engineering 2004, Vols 1-4　2471-2483　2005

DOI： 10.1142/9789812701916-0199 　
AN OUTLINE OF HEAVY RAINFALL DISASTERS IN HIDAKA REGION, HOKKAIDO, BY TYPHOON NO.10, 2003 Peer-reviewed

HASEGAWA Kazuyoshi, SUZUKI Hiroyuki, SUZUKI Yuichi, TANAKA Gaku, TANAKA Hitoshi, TOHMA Satoshi, NAKATSUGAWA Makoto, HATTA Shigemi, MURAKAMI Yasuhiro, YAMASHITA Toshiko, YAMADA Takashi, ARAYAE Tohru, WATANABE Yasuharu, WATANABE Yasunori, FUJITA Mutsuhiro, OGAWA Takehiro, KIKUCHI Shunichi, KUROKI Mikio, KOMATSU Toshimitsu, SAGA Hiroshi, SHIMIZU Osamu

PROCEEDINGS OF HYDRAULIC ENGINEERING　49　(49)　427-432　2005
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.49.427 　

ISSN： 0916-7374

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The typhoon No.10 hit the Pacific cost in Hokkaido on August 9 in 2003. The casualties were 10 killed and 3 wounded. The missing person has not been found yet. This typhoon gave the biggest damage by flood to Hokkaido in the last twenty years. In Saru River basin and Appetu River basin in Ilidaka region, serious damages, such as flooded house, house failure and bridge fall, occurred by this typhoon. Farmland and flood plain were covered for the large sediment. In this paper, we will report an outline of heavy rainfall disasters of Hidaka region in Hokkaido by the typhoon No.10. We hope that the result of this investigation helps to clarify the mechanisms of the heavy rainfall disasters with hydrologic and hydraulic knowledge.
Field observation of salinity intrusion into Nagatsura-ura Lagoon Peer-reviewed

Hitoshi Tanaka, Mitsuru Takasaki, Hyun-seok Lee, Hiroto Yamaji

Proceedings of 4th Congress of Environmental Hydraulics　737-743　2004/12
Measuring system of suspended sediment concentration at a river entrance Peer-reviewed

Hitoshi Tanaka, Ryoji Sugawara, Hiroto Yamaji, Suntoyo

Proceedings of 14th APD-IAHR Congress　2099-2105　2004/12
Estimation of water depth at a river mouth using water level variations -application to Lake Jusan- Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of 14th APD-IAHR Congress　1141-1146　2004/12
Shoreline change in Yuriage Fishing Port due to breakwater extension Peer-reviewed

Somboon Pornpinatepong, Hitoshi Tanaka, Kazuya Watanabe, Patchanok Srivihok

Proceedings of 14th APD-IAHR Congress　1109-1114　2004/12
Shoreline change due to highly oblique waves in Lake Inawashiro Peer-reviewed

Yutaka Fujita, Hitoshi Tanaka

Proceedings of 14th APD-IAHR Congress　1095-1100　2004/12
Monitoring of long-term shoreline evolution on Sendai Coast Peer-reviewed

Hyun-woo Kang, Hitoshi Tanaka

Proceedings of 14th APD-IAHR Congress　1101-1107　2004/12
Use of old maps for studying shoreline change in Japan Peer-reviewed

Hitoshi Tanaka, Hideo Matsutomi, Norihiro Izumi

Proceedings of 14th APD-IAHR Congress　1129-1134　2004/12
Simulation of salinity in the Hau River estuary, Viet Nam by using artificial neural networks model Invited Peer-reviewed

Nguyen Trung Viet, Hitoshi Tanaka

Proceedings of 2nd International Symposium on Southeast Asian Water Environment　2004/12
Estimation of salinity in the lower Mekong River Invited Peer-reviewed

Hitoshi Tanaka, Nguyen Trung Viet, Tang Duc Thang

Proceedings of International Symposium on the Development of Water Resource Management System in Mekong Watershed　75-81　2004/12
Operation of optic measureing system for suspended sediment concentration Peer-reviewed

Ryoji Sugawara, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of Coastal Engineering JSCE　51　391-395-395　2004/11
Publisher:
DOI： 10.2208/proce1989.51.391 　

ISSN： 0916-7897
Bottom shear stress and sediment movement under saw tooth waves Peer-reviewed

Suntoyo, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　51　396-400　2004/11
Publisher:
DOI： 10.2208/proce1989.51.396 　

ISSN： 0916-7897
Analysis of morphdynamics at Nanakita River mouth using highly frequent aerial photographs Peer-reviewed

Patchanok Srivihok, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　51　531-535　2004/11
Publisher:
DOI： 10.2208/proce1989.51.531 　

ISSN： 0916-7897
Monitoring of long-term shoreline change and evaluation sediment budget on Sendai Coast Peer-reviewed

Hyun-woo Kang, Hitoshi Tanaka, Takeshi Sakaue

Proceedings of Coastal Engineering JSCE　51　536-540　2004/11
Publisher:
DOI： 10.2208/proce1989.51.536 　

ISSN： 0916-7897
Mechanism of DO variation in Nagatsura-ura Lagoon Peer-reviewed

Naoya Okajima, Hitoshi Tanaka, Manabu Kanesato, Mutsuru Takasaki, Hiroto Yamaji

Proceedings of Coastal Engineering JSCE　51　936-940　2004/11
Publisher:
DOI： 10.2208/proce1989.51.936 　

ISSN： 0916-7897
Salinity variation in a river mouth with medium scale Peer-reviewed

Ken Endo, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　51　586-590　2004/11
Publisher:
DOI： 10.2208/proce1989.51.886 　

ISSN： 0916-7897
Beach cusp formed by waves with crests prallel to the shoreline Peer-reviewed

Asako Tanikawa, Norihiro Izumi, Hitoshi Tanaka

Journal of Applied Mechanics　7　(2)　1005-1012　2004/08
Publisher:
DOI： 10.2208/journalam.7.1005 　

ISSN： 1345-9139
Civil Engineers’ Qualification System of JSCE Peer-reviewed

Hitoshi Tanaka, Syunsuke Ikeda

Proceedings of the 3rd Civil Engineers Conference in the Asian Region　145-148　2004/08
A new method for calculating bottom shear stress under sawtooth waves Peer-reviewed

Suntoyo, Hitoshi Tanaka, Hiroto Yamaji

Journal of Applied Mechanics　7　(2)　1089-1097　2004/08
Publisher:
DOI： 10.2208/journalam.7.1089 　

ISSN： 1345-9139
Numerical modeling of oscillatory boundary layers using two-equation turbulence models Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Proceedings of 6th International Conference on Hydro-science and Engineering (CD-ROM)　521-528　2004/06
Deformation of sand spit at jettied river mouths Peer-reviewed

Ikuo Kawamura, Hitoshi Tanaka

Advances in River Engineering　10　357-362　2004/06
Water level and morphology change at a river mouth and its influence on estuary ecosystem Invited Peer-reviewed

Hitoshi Tanaka

Kaiyo Monthly　36　(3)　236-241　2004/03
Relationship between sediment deposit in an intake pond of the Asaka Channel and sedimentray environment in Lake Inawashiro Peer-reviewed

Hitoshi Tanaka, Yutaka Fujita, Naoya Okajima

Journal of Japan Society for Natural Disaster Science　22　(4)　85-95　2004/03
Publisher:
ISSN： 0286-6021

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Investigations on shoreline change in a lake are useful for understanding similarity law of coastal sedimentation processes, because the scale of topographical change and external forces are smaller in a lake than those encountered along seashore, but sufficiently bigger than those in a laboratory flume. In this study, long-term shoreline change around the mouth of the Nagase River in Lake Inawashiro, Japan is investigated by analyzing topographical maps as well as aerial photographs. The main conclusion of the present study is that the sediment supplied from the Nagase River moves in the eastern direction, because the seasonal wind in winter from northwest direction causes strong waves propagating in the eastern direction with highly oblique incident angle to the shoreline, resulting in considerable longshore sediment movement to the east. Sediment deposit in an intake pond of the Asaka Channel can be attributed to the longshore sediment movement from the Nagase River mouth.
Field observations of DO concentration variation in Magatsura-Ura Lagoon on Southern Sanriku Coast Peer-reviewed

Mitsuru Takasaki, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　48　1411-1416　2004/03

DOI： 10.2208/prohe.48.1411 　
Effects of hydrologic fluctuations on the transport of fine particulate organic matter in the Nanakita River Peer-reviewed

Sitang Pilailar, Sakamaki Takashi, Yuko Hara, Norihiro Izumi, Hitoshi Tanaka, Osamu Nishimura

Annual Journal of Hydraulic Engineering　48　1519-1524　2004/03

DOI： 10.2208/prohe.48.1519 　
Analysis of river mouth behavior change by using aerial photographs Peer-reviewed

Patchanok Srivihok, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　48　733-738　2004/03

DOI： 10.2208/prohe.48.733 　
Use of water level variation for estimating water depth at a river entrance Peer-reviewed

K Watanabe, H Tanaka

PROCEEDINGS OF THE NINTH INTERNATIONAL SYMPOSIUM ON RIVER SEDIMENTATION, VOLS 1-4　1925-1932　2004
Effectiveness of jetty construction at the Shiribetsu River mouth, Japan Peer-reviewed

H Tanaka, HS Lee

PROCEEDINGS OF THE NINTH INTERNATIONAL SYMPOSIUM ON RIVER SEDIMENTATION, VOLS 1-4　1875-1881　2004
Impact of port construction on coastal and river mouth morphology - A case study at Sendai Fort Peer-reviewed

H Tanaka, P Srivihok

PROCEEDINGS OF THE NINTH INTERNATIONAL SYMPOSIUM ON RIVER SEDIMENTATION, VOLS 1-4　406-415　2004
Experimental study on bottom shear stress under saw-tooth wave Peer-reviewed

Suntoyo, Hitoshi Tanaka

Proceedings of 2nd Asian and Pacific Coastal Engineering Conference　2003/12
Recovery process of sand spit at the Natori River mouth Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of 2nd Asian and Pacific Coastal Engineering Conference (CD-ROM)　2003/12
Field observation of beach evolution in Lake Inawashiro, Japan Peer-reviewed

Naoya Okajima, Hitoshi Tanaka, Yutaka Fujita

Proceedings of 2nd Asian and Pacific Coastal Engineering Conference　2003/12
Influence of jetty construction on morphology and wave set-up at a river mouth Peer-reviewed

H Tanaka, HS Lee

COASTAL ENGINEERING JOURNAL　45　(4)　659-683　2003/12

DOI： 10.1142/S0578563403000956 　

ISSN： 0578-5634
Development of profiler system for suspended sediment concentration Peer-reviewed

Ryoji Sugawara, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of 2nd Asian and Pacific Coastal Engineering Conference　2003/12
Special issue - Progress in hydrodynamics and morphodynamics of tidal inlets a global update - Preface Invited

H Tanaka, H Tanaka, NC Kraus

COASTAL ENGINEERING JOURNAL　45　(4)　2003/12

DOI： 10.1142/S0578563403000968 　

ISSN： 0578-5634
Mathematical modeling of morphological change at a river mouth Peer-reviewed

Hitoshi Tanaka

Proceedings of International Symposium on Estuary and Coast　87-98　2003/11
Accuracy of an estimation method of water depth at a river mouth using water level variation Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of International Symposium on Estuary and Coast　146-152　2003/11
Recent morphological change at the Naruse River mouth, Japan Peer-reviewed

Ikuo Kawamura, Hitoshi Tanaka

Proceedings of International Symposium on Estuary and Coast　199-204　2003/11
The influence of physical and biological processes on the budget of fine particulate organic matter in the Nanakita River Peer-reviewed

Sitang Pilailar, Takashi Sakamaki, Hitoshi Ozaki, Norihiro Izumi, Hitoshi Tanaka

Proceedings of IWA-Asia Pacific Conference　2003/10
Estimation of river mouth depth using water level variation at the Natori River mouth Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Annula Journal of Coastal Engineering, JSCE　50　61-65　2003/10
Publisher:
DOI： 10.2208/proce1989.50.61 　

ISSN： 0916-7897
Chracteristics of bottom shear stress under sawtooth waves Peer-reviewed

Suntoyo, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Coastal Engineering, JSCE　50　66-70　2003/10
Publisher:
DOI： 10.2208/proce1989.50.66 　

ISSN： 0916-7897
Monitoring of river mouth morphology change by aerial photograph analysis Peer-reviewed

Patchanok Srivihok, Hitoshi Tanaka

Proceedings of 6th International Conference on the Environmental Management of Enclosed Coastal Seas　129-139　2003/10
Morphological change at the Natori River mouth caused by reduction of tidal compartment Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of XXX IAHR Congress　Theme B　547-553　2003/08
Inceptive topography of fluvial-dominated river mouth terraces: theory Peer-reviewed

Norihiro Izumi, Hitoshi Tanaka, Naomasa Date

Journal of Hydraulic, Coastal and Environmental Engineering　740　(II-64)　95-107　2003/08
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.2003.740_95 　

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A mathematical model is presented to describe the formation of river mouth terraces in this paper. The spatial distributions of velocity and suspended sediment concentration are obtained by the use of the integration method and the similarity assumption of lateral profiles of velocity and suspended sediment concentration. The inceptive topography of river mouth terraces are then obtained from the velocity and sediment concentration distributions. It is found that the sediment deposits on both sides of the jet axis when the suspended load is dominant and the effect of advection and diffusion is relatively small, while it deposits on the axis when the bedload is dominant.
Inceptive topography of fluvial-dominated river mouth terraces: experiments Peer-reviewed

Norihiro Izumi, Hitoshi Tanaka, Kosuke Tsuboi, Masanao Date

Journal of Hydraulic, Coastal and Environmental Engineering　740　(II-64)　109-120　2003/08
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.2003.740_109 　

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Laboratory experiments of river mouth jets were performed to investigate the profiles of velocity and suspended sediment concentration, and the inceptive topography of fluvial-dominated river mouth terraces. The experimental results were found to show reasonably good agreement with the theory proposed by some of the authors. The experiments revealed that the sediment deposits on both sides of the jet axis if the suspended load is dominant, which had been predicted by the theory. It was shown in the experiments that river mouth terraces develop into elongate deltas under the condition of dominant suspended load, which appeared to be definitely different from deltas formed under the condition of dominant bedload.
Investigation of turbulent bottom boundary layer under sawtooth waves Peer-reviewed

Suntoyo, Hitoshi Tanaka

Proceedings of 5th International Summer Symposium　5　185-188　2003/07
Morphology and sediment transport in Lake Inawashiro Japan Peer-reviewed

Hitoshi Tanaka, Yutaka Fujita, Naoya Okajima

Proceedings of Coastal Sediments ‘03　2003/06
Accuracy of an estimation method of water depth at a river mouth using measured water level variation Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka

Proceedings of River Hydraulics and Environment　9　2003/06
Influence of morphological change on water level rise at the Shiribetsu River mouth Peer-reviewed

Hitoshi Tanaka, Hyun-seok Lee, H.S, Kazuya Furumichi

Journal of Hydroscience and Hydraulic Engineering　21　(1)　2003/04
Acceleration effect on shear stress in turbulent boundary layer under skew waves Peer-reviewed

Suntoyo, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal Hydraulic Engineering　47　811-816　2003/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.47.811 　

ISSN： 0916-7374

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Bottom shear stress estimation is the crucial step, which is required as an input to most of sediment transport model. Acceleration effect in waves with a bit of saw-tooth asymmetry causes the higher bottom shear stress occurs at higher acceleration and hence a higher probability for sediment transport. The acceleration effect on turbulent bottom boundary layer is investigated with the experiments in oscillating wind tunnel over rough bed under saw-tooth wave by Laser Doppler Velocimeter (LDV) to measure velocity distribution. Bottom shear stress will be estimated by fitting the logarithmic velocity profile to the measured velocity. Furthermore, the experimental results will be examined with the bottom shear stress calculation method incorporating acceleration effects.
The characteristic change of fine particulate organic matter due to a flood in the Nanakita River Peer-reviewed

P. Sitang, T. Sakamaki, Norihiro Izumi, Hitoshi Tanaka, Osamu Nishimura

Annual Journal Hydraulic Engineering　47　1033-1038　2003/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.47.1033 　

ISSN： 0916-7374

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Sediment sampling was conducted at three locations before and after a flood in the Nanakita river. The sediment samples were analyzed to obtain the information on the particle size distribution, the amount of resuspendable fine particulate organic matter (FPOM) available on the bed, and the composition of the basic nutrients, carbon, nitrogen and phosphorous, in the FPOM. The data suggest that there is an equilibrium state in which the amount of FPOM on the bed is constant in the low flow condition. The behavior of FPOM is found to show strong locality; the amount of FPOM on the bed increases during floods at some locations while it decreases during floods at other locations. In the analysis of nutrients and the microscopic observation, it is suggested that FPOM accumulated on the bed during floods is directly originated from the terrestrial area. FPOM that accumulated in the sediment after flood at all locations are found to be gradually changed in size and composition because biological activities are in process and dominant in the low flow condition.
River bed characteristics and their change of the Natori River Peer-reviewed

Asako Tanikawa, Norihiro Izumi, Hitoshi Tanaka

Annual Jurnal of Hydraulic Engineering　47　607-612　2003/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.47.607 　

ISSN： 0916-7374

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In the alluvial reach of the Natori river, two distinctive morphological features can be seen. The reach from the upstream of Taihaku bridge to the confluence with the Hirose river is characterized by unstable, braided configuration while the reach downstream of the confluence is rather stable. This study provides a theoretical explanation for the distinctions between two reaches in a same river by the use of the theories of stable channel cross-section of straight gravel and sand-silt rivers, and the theory of bar formation. The differences of grain size and bed slope are found to cause such a contrast.
Visualization of large-scale internal Seiche in Lake Inawashiro Peer-reviewed

H Tanaka, Y Fujita, H Yamaji

JOURNAL OF VISUALIZATION　6　(1)　4-4　2003

ISSN： 1343-8875
SEDIMENT INTRUSION into GAMO LAGOON by WAVE OVERTOPPING Peer-reviewed

Hitoshi Tanaka, Suntoyo, Tsuyoshi Nagasawa

Proceedings of the Coastal Engineering Conference　2003-　823-835　2003
Publisher: American Society of Civil Engineers (ASCE)
DOI： 10.1142/9789812791306_0070 　

ISSN： 0161-3782
Visualization of large-scale internal Seiche in Lake Inawashiro Peer-reviewed

H Tanaka, Y Fujita, H Yamaji

JOURNAL OF VISUALIZATION　6　(1)　4-4　2003

DOI： 10.1007/BF03180955 　

ISSN： 1343-8875
Hydrodynamics and material transport at river mouths Invited Peer-reviewed

Hitoshi Tanaka

Umi To Sora　78　(2)　35-41　2002/12
River mouth improvement and resulting topography change at Natori River Peer-reviewed

Kazuya Watanabe, Hitoshi Tanaka, Toshiaki Tsukiyama

Proceedings of Coastal Engineering JSCE　49　1361-1365　2002/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.49.1361 　

ISSN： 0916-7897
Study on turbulence structure under irregular waves Peer-reviewed

Ken Suzuki, Hitoshi Tanaka, Hiroto Yamaji, Suntoyo

Proceedings of Coastal Engineering JSCE　49　146-150　2002/11
Publisher:
DOI： 10.2208/proce1989.49.146 　

ISSN： 0916-7897
Quantitative evaluation of wave set-up in Shiribetsu River mouth Peer-reviewed

Hitoshi Tanaka, Hyun-seok Lee, Kazuya Furumichi

Proceedings of Coastal Engineering JSCE　49　371-375　2002/11
Publisher:
DOI： 10.2208/proce1989.49.371 　

ISSN： 0916-7897
Analysis of sediment budget on Ishinomaki Coast, Japan Peer-reviewed

Kaori Inoue, Hitoshi Tanaka, Norihiro Izumi

Proceedings of Coastal Engineering JSCE　49　516-520　2002/11
Publisher:
DOI： 10.2208/proce1989.49.516 　

ISSN： 0916-7897
Relation between wave height and sessile organism on Aomori Coast Peer-reviewed

Kimihito Inoue, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　49　1226-1230　2002/11
Publisher:
DOI： 10.2208/proce1989.49.1226 　

ISSN： 0916-7897
Field observation of water temperature in Lake Inawashiro and its visualization Peer-reviewed

Yutaka Fujita, Hitoshi Tanaka, Yasunori Totsuka, Hiroto Yamaji, Kaoru Aikawa, Masaki Sawamoto

Journal of The Visualization Society of Japan　22　(8)　64-70　2002/08
Publisher: The Visualization Society of Japan
DOI： 10.3154/tvsj.22.64 　

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Lake Inawashiro, located in Fukushima Prefecture, is a typical deep acid lake in Japan. The water from Nagase River, which pours to the lake from the north, is the cause of acid water quality in this lake. Deep lakes have a possibility of occurrence of internal seiche, which is very important in terms not only of hydrodynamics but also of water quality variation. A field observation was carried out in Lake Inawashiro in autumn in 1999, when the thermal structure was overturned. From the result of the present water temperature observation, internal seiche was detected successfully along the line from the south to the north. The wave height and the difference of water temperature variation reached about 15 m and 8 degrees, respectively and internal seche continued about 6 days. After this event, the thermocline disappeared. This suggests that the internal seiche promoted lake water mixing in full depth scale.
Investigation of turbulent flow in an oscillatory boundary layer under sawtooth wave Peer-reviewed

Suntoyo, Hitoshi Tanaka, Hiroto Yamaji

Proceedings of 4th International Summer Symposium　171-174　2002/08
Remote sensing and EOF analysis of surface temperature distribution in a lake Peer-reviewed

Manabu Takuwa, Hitoshi Tanaka, Yutaka Fujita, Chan-Su Yang

Proceedings of the 10th International Symposium on Flow Visualization(CD-ROM)　2002/08
Change in topography and water level fluctuation caused by construction of jetty at the Shiribetsu River mouth Peer-reviewed

Hitoshi Tanaka, Hyun-seok Lee, Kazuya Furumichi

Civil Engineering in the Ocean　18　461-466　2002/06
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prooe.18.461 　

ISSN： 0912-7348

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At the Shiribetsu River mouth located in Hokkaido, Japan, water level rise due to wave set-up has frequently been observed every year from October to March, and it is reported that the magnitude of water level rise shows very close correlation with sand spit length at the river mouth. Ariver mouth jetty has been constructed at the right hand side of the river mouth during the period from July 1999 to October 1999. In this study, the effectiveness of the jetty construction is studied from aviewpoint of river mouth morphology and water level variation. It is confirmed that the prevention of longshore sediment movement caused by construction of the jetty led to stability of the river mouth topography. Furthermore, the water depth at the river entrance has increased, resulted in the reduction of water level rise in the river mouth caused by wave breaking.
A study on river mouth maintenace of the Shiribetsu River Peer-reviewed

Yasuyuki Shimizu, Hitoshi Tanaka, Toshihiko Yamashita, Hiroshi Hayakawa, Kazuya Furumichi

Advances in River Engineering　8　109-114　2002/06
Publisher:
Detailed observation of water level fluctuation at the Natori River mouth Peer-reviewed

Kazuya Watanabe, Hiroto Yamaji, Hitoshi Tanaka

Advances in River Engineering　8　401-406　2002/06
Seasonal variation of sand spit and its effect on fluctuation characteristics water level at the mouth of Shiribetsu River Peer-reviewed

Hitoshi Tanaka, Hyun-seok Lee

Annual Journal of Hydraulic Engineering JSCE　46　965-970　2002/02

DOI： 10.2208/prohe.46.965 　
Experiments on the instability of a river mouth in a pocket beach Peer-reviewed

Norihiro Izumi, H.P.V. Vithana, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering JSCE　46　773-778　2002/02
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.46.773 　

ISSN： 0916-7374

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It is commonly observed that, in pocket beaches, river mouths are located at either end of beaches adjacent to one of the headlands. Izumi et. al. presented a linear stability theory to explain the instability of river mouths in pocket beaches. The theory shows that river mouths cannot stay stably in the central region of beaches but can stay only within regions near either end of beaches when the capability of longshore sediment transport is not sufficient compared with the load of river sediment supply. In this study, a series of experiments are performed to study the instability of river mouths with the use of a simplified physical model. It is found that river mouths are always unstable at the center of beaches even without the shielding effect of headlands on the wave energy; thus, the shielding effect is not essential for the instability. Contrary to the theoretical results, river mouths are unstable at the beach center even if sediment supply is not sufficiently large.
Relation between wave-induced current and algae community on artificial reef Peer-reviewed

Kimihito Inoue, Hitoshi Tanaka, Osamu Nishimura, Satoshi Baba

Annual Journal of Hydraulic Engineering JSCE　46　977-982　2002/02

DOI： 10.2208/prohe.46.977 　
Study on numerical simulation of flow in an intale structure using a low Reynolds number k-e model Peer-reviewed

Yo Kumagai, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering JSCE　46　863-868　2002/02

DOI： 10.2208/prohe.46.863 　
Investigation of rough bottom boundary layer under irregular waves Peer-reviewed

Takeshi Suzuki, Hitoshi Tanaka, Hiroto Yamaji

Annual Journal of Hydraulic Engineering JSCE　46　869-874　2002/02

DOI： 10.2208/prohe.46.869 　
Time-variation of bottom shear stress under irregular waves over rough bed Peer-reviewed

Hitoshi Tanaka, Takeshi Suzuki, Suntoyo, Hiroto Yamaji

Journal of Hydroscience and Hydraulic Engineering　20　(2)　217-225　2002
The function of uptale and release of nutrients by the leaf and the root of Zostera marina Peer-reviewed

Kimihito Inoue, Osamu Nishimura, Ryuichi Sudo, Hitoshi Tanaka

Jour. Japanese Assoc. Coastal Zone Studies　14　115-123　2002
Detailed observation of water level variation at the mouth of Natori River, Japan Peer-reviewed

K Watanabe, H Tanaka, H Yamaji

COASTAL ENVIRONMENT　8　269-278　2002

ISSN： 1462-6098
Prediction of water level in a river mouth using neural network approach Peer-reviewed

HS Lee, H Tanaka

ADVANCES IN HYDRAULICS AND WATER ENGINEERING, VOLS 1 AND 2, PROCEEDINGS　669-674　2002
Analysis of shoreline change on Sendai Coast using empirical eigenfunction method Peer-reviewed

H Tanaka, T Nagasawa

ADVANCES IN HYDRAULICS AND WATER ENGINEERING, VOLS 1 AND 2, PROCEEDINGS　836-841　2002
Shoreline change around the mouth of Nagase River in Lake Inawashiro Peer-reviewed

Y Fujita, H Tanaka

ADVANCES IN HYDRAULICS AND WATER ENGINEERING, VOLS 1 AND 2, PROCEEDINGS　853-858　2002
Effect of wave-induced current on algal community development on artificial reefs Peer-reviewed

K Inoue, H Tanaka, O Nishimura, S Baba

ADVANCES IN HYDRAULICS AND WATER ENGINEERING, VOLS 1 AND 2, PROCEEDINGS　892-897　2002
Numerical simulation of effluent current at a river mouth using boundary-fitted coordinates Peer-reviewed

Nobuaki Itonaga, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　48　416-420　2001/11
Publisher:
DOI： 10.2208/proce1989.48.416 　

ISSN： 0916-7897
Shoreline change around the Nagase River mouth in Lake Inawashiro Peer-reviewed

Yutaka Fujita, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　48　616-620　2001/11
Publisher:
DOI： 10.2208/proce1989.48.616 　

ISSN： 0916-7897
Water level variation at a mouth of small to medium scale river Peer-reviewed

Shun-ichi Oshiyama, Hyun-Suk Lee, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　48　411-415　2001/11
Publisher:
DOI： 10.2208/proce1989.48.411 　

ISSN： 0916-7897
Detection of shoreline position using aerial photographs Peer-reviewed

Tatsuaki Kurosawa, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　48　586-590　2001/11
Publisher:
DOI： 10.2208/proce1989.48.586 　

ISSN： 0916-7897
Long-term mean environment of sea surface temperature in Sendai Bay and the adjacent area based on SVD and heat budget analysis Peer-reviewed

C.S. Yang, H. Tanaka, M. Sawamoto, K. Hanawa

Proceedings of Coastal Engineering JSCE　48　1456-1460　2001/11
Publisher:
DOI： 10.2208/proce1989.48.1456 　

ISSN： 0916-7897
Relationship between river mouth morphology and wave set-up height at Shiribetsu River, Japan, Peer-reviewed

Hitoshi Tanaka, H.S. Lee

Proceedings of 2nd Symposium on River, Coastal and Estuarine Morphodynamics　495-504　2001/09
Influence of Advection of Kuroshio Water on Abnormal Catch of Fish in June 1999, at the Coastal Zone of Soma, Northeast Japan Peer-reviewed

Chan-Su YANG, Hitoshi TANAKA, Masaki SAWAMOTO, Kimio HANAWA

Annual Journal of Hydraulic Engineering, JSCE　45　1057-1062　2001/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.45.1057 　

ISSN： 0916-7374

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We analyze month-to-month variability of offshore condition using chlorophyll concentration based on in situ and satellite observations and to examine the abnormal catch event around sea area of Soma in June 1999. Time series of vertical distribution of DO and nutrient concentration (nitrogen, phosphorus), wind vector and AVHRR/SST are also used to understand the surrounding environments around Sendai Bay. Sea WiFS-derived concentration of chlorophyll a reveals that Sendai Bay represents small seasonal variation and the coastal region around the bay seems to be not affected directly by offshore condition. It is found that the abnormal catch phenomenon resulted from that the occurrence of advection and upwelling in this area does not appear to be due to the local wind but offshore current.
Field Observation of Internal Seiche in Lake Inawashiro Peer-reviewed

Yasunori Totsuka, Hitoshi Tanaka, Yutaka Fujita, Hiroto Yamaji, Kaoru Aikawa, Manabu Takuwa, Masaki Sawamoto

Annual Journal of Hydraulic Engineering, JSCE　45　1177-1182　2001/03

DOI： 10.2208/prohe.45.1177 　
Review of kappa-epsilon model to analyze oscillatory boundary layers (vol 126, pg 701, 2000)

A Sana, H Tanaka

JOURNAL OF HYDRAULIC ENGINEERING-ASCE　127　(2)　173-173　2001/02

ISSN： 0733-9429
Flow transitional behavior in smooth bottom boundary layer beneath irregular oscillatory motions Peer-reviewed

Mustafa Ataus Samad, Hitoshi Tanaka, Hiroto Yamaji

Journal of Hydroscience and Hydraulic Engineering　19　(1)　117-130　2001

ISSN： 0912-2508
Effect of wave-induced current on algal community development on artificial reefs Peer-reviewed

Kimihito Inoue, Hitoshi Tanaka, Osamu Nishimura, Satoshi Baba

Environmental Engineering Research　38　21-29　2001
Publisher: Japan Society of Civil Engineers
DOI： 10.11532/proes1992.38.21 　

ISSN： 1341-5115

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In recent years, a social demand toward an ecological aspect of a coastal area is increasing. However, very little things have been known about the relationshipbetween an ecosystem and a coastal environment. The objective of the present study is to investigate the transition of algae community on artificial reefs afterconstruction, and the relationship between the development of algae on artificial reefs and the intensity of wave-induced current around artificial reefs will be discussed.
Flow and salinity in the Meghna Estuary, Bangladesh Peer-reviewed

Mustafa Ataus Samad, M.H. Azam, M. Mahboob-ul-kabir, Hitoshi Tanaka

Proceedings of 8th International Symposium on Flow Modeling and Turbulence Measurements　485-492　2001
Comparison between numerical simulation and experiment for intake channel flow with 90 degree bend and gradual expansion Peer-reviewed

Yo Kumagai, Hitoshi Tanaka

Proceedings of 8th International Symposium on Flow Modeling and Turbulence Measurements　355-362　2001
Direct measurement of bottom shear stress under irregular waves Peer-reviewed

Takeshi Suzuki, Hitoshi Tanaka, Hiroto Yamaji, Mustafa Ataus Samad

Proceedings of 8th International Symposium on Flow Modeling and Turbulence Measurements　405-412　2001
Utilization of two-layer turbulence models to analyze an oscillatory boundary layer on a smooth bottom Peer-reviewed

Ahmad Sana, Hitoshi Tanaka

Proceedings of 8th International Symposium on Flow Modeling and Turbulence Measurements　517-524　2001
Numerical simulation of effluent flow at Natori River mouth using boundary-fitted coordinates Peer-reviewed

Hitoshi Tanaka, Nobuaki Itonaga

Proceedings of 8th International Symposium on Flow Modeling and Turbulence Measurements　525-532　2001
Separation of shoreline change caused by cross-shore and longshore sediment transports Peer-reviewed

H Tanaka, T Mori

COASTAL DYNAMICS '01: PROCEEDINGS　192-201　2001

DOI： 10.1061/40566(260)20 　
Study on grid dependence of numerical simulation for circular pipe flow using low-Reynolds number k-epsilon model Peer-reviewed

Y Kumagai, H Tanaka

HYDRAULICS OF RIVERS WATER WORKS AND MACHINERY, VOL II, THEME D, PROCEEDINGS　552-558　2001
Topographically induced upwelling of the Kuroshio and its effect, northeast Japan Peer-reviewed

CS Yang, H Tanaka, M Sawamoto, K Hanawa

HYDRAULICS FOR MARITIME ENGINEERING, THEME E, PROCEEDINGS　439-444　2001
A study on internal seiche in Lake Inawashiro Peer-reviewed

Y Totsuka, H Tanaka, Y Fujita, H Yamaji, M Takuwa, M Sawamoto

ENVIRONMENTAL HYDRAULICS AND ECO-HYDRAULICS, THEME B, PROCEEDINGS　578-583　2001
Water level variation and sand spit development at the Shiribetsu River mouth, Japan Peer-reviewed

HS Lee, H Tanaka

PROCEEDINGS OF THE FIRST ASIAN AND PACIFIC COASTAL ENGINEERING CONFERENCE, VOLS 1 AND 2 (APACE 2001)　818-827　2001
Three dimensional empirical eigen function analysis of contour line data on Sendai Coast Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　47　621-625　2000/11
Publisher:
DOI： 10.2208/proce1989.47.621 　

ISSN： 0916-7897
Sea surface temperature environment around Sendai Bay in the cooling period Peer-reviewed

Chan-Su Yang, Hitoshi Tanaka, Masaki Sawamoto, Miko Hanawa

Proceedings of Coastal Engineering JSCE　47　1371-1375　2000/11
Publisher:
DOI： 10.2208/proce1989.47.1371 　

ISSN： 0916-7897
History effect on turbulent transition in the irregular wave boundary layer Peer-reviewed

Takeshi Suzuki, Mustafa Ataus Samad, Hiroto Yamaji, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　47　61-65　2000/11
Publisher:
DOI： 10.2208/proce1989.47.61 　

ISSN： 0916-7897
Change in water level variation and benthos caused by dredging in tidal compartment Peer-reviewed

Hitoshi Tanaka, Hidekazu Yamamoto

Proceedings of Coastal Engineering JSCE　47　1136-1140　2000/11
Publisher:
DOI： 10.2208/proce1989.47.1136 　

ISSN： 0916-7897
‘History effect' on turbulent transition in the bottom boundary layer under irregular waves Peer-reviewed

Samad, M.A, Tanaka, H, Yamaji, H

Proceedings of 12th Congress of APD-IAHR, Vol.II　405-415　2000/11
Current and water quality profile measurements for seawater intrusion at the Abukuma River mouth Peer-reviewed

Konno, O, Mano, A, Tanaka, H

Proceedings of 12th Congress of APD-IAHR, Vol.II　545-552　2000/11
Use of back propagation networks in estimating the bottom shear stress under wave and current combined flows Peer-reviewed

Supharatid, S, Tanaka, H

Proceedings of 12th Congress of APD-IAHR, Vol.II　483-489　2000/11
Field observation and numerical computation of delta formation at a river mouth Peer-reviewed

Ryo Hondo, Norihiro Izumi, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　47　536-540　2000/11

DOI： 10.2208/proce1989.47.536 　
Estimating instantaneous turbulent bottom shear stress under irregular waves Peer-reviewed

Takeshu Suzuki, Mustafa Ataus Samad, Hiroto Yamaji, Hitoshi Tanaka

Journal of Applied Mechanics JSCE　3　797-804　2000/09
Publisher:
DOI： 10.2208/journalam.3.797 　

ISSN： 1345-9139
Review of k-epsilon model to analyze oscillatory boundary layers Peer-reviewed

A Sana, H Tanaka

JOURNAL OF HYDRAULIC ENGINEERING-ASCE　126　(9)　701-710　2000/09

DOI： 10.1061/(ASCE)0733-9429(2000)126:9(701) 　

ISSN： 0733-9429
Filtering of the bottom shear stress under wave-current interactions by using the artificial neural networks, Peer-reviewed

Seree Supharatid, Hitoshi Tanaka

Proceedings of 4th International Conference on Hydrodynamics　1　557-562　2000/09
Stability of asymmetric wave boundary layers Peer-reviewed

Hitoshi Tanaka, Ahmad Sana, Ikuo Kawamura, Hiroto Yamaji

Proceedings of 4th International Conference on Hydrodynamics　2　563-568　2000/09
Effect of grid spacing on the prediction of sediment movement in a curved channel, Peer-reviewed

Noriaki Itonaga, Ahmad Sana, Hitoshi Tanaka, Mustafa Ataus Samad

Proceedings of 4th International Conference on Hydrodynamics　1　653-658　2000/09
ADCP measurements of sea water exchange in Sizugawa Bay Peer-reviewed

Yasunori Totsuka, Hitoshi Tanaka, Chan-Su Yang, Masaki Sawamoto, Hiroto Yamaji

Proceedings of 4th International Conference on Hydrodynamics　1　747-752　2000/09
Influence of Weather and Offshore Conditions on the Sea Surface Temperature Variability in the Coastal Area of Northeast Japan Peer-reviewed

Chan-Su YANG, Hitoshi TANAKA, Masaki SAWAMOTO, Kimio HANAWA

Proc. 4th Int. Conf. on Hydro-Science and -Engineering(CD-ROM)　4　2000/09
An Improvement of Nonlinear Dispersive Multi-Level Wave Models and Their Application to Quasi-3-Dimensional Problem Peer-reviewed

S. Kanayama, H. Tanaka, N. Shuto

Journal of Hydraulic, Coastal and Environmental Engineering　642　(II-50)　77-86　2000/02
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.2000.642_77 　

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Two new versions of the multi-level models for nonlinear dispersive water, in which vertical profile of horizontal velocity is assumed to be a chain of quadratic portions, are proposed aiming to improvement of efficiency of calculation and applicability to quasi-3-dimensional problem respectively. The properties of the model in dispersion relation and second-order nonlinear interactions are confirmed by comparison with that of the Stokes wave theory. The applicability of the models is examined by reproduction of experimental result for submerged dike and floating body.
ESTIMATION OF THE THERMAL ENVIRONMENT AROUND THE SENDAI BAY

YANG Chan-Su, TANAKA Hitoshi, SAWAMOTO Masaki, HANAWA Kimio

Doboku Gakkai Ronbunshuu B　16　135-140　2000
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prooe.16.135 　

ISSN： 0912-7348

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To find the characteristics of coastal sea surface temperature (CSST) variations in the Kuroshio/Oyashio frontal region, the calculation of the heat flux and the interpretation of satellite data are performed. The CSST and meteorological data from January through December 1995 are used to estimate the net surface heat flux and heat content for the Sendai Bay. The largest heat gain (+56 Wm^-2) occurs in the Matsukawaura, where strong Kuroshio/Oyashio interaction produces anomalous CSSTs and wind is more moderate than other regions over most of the year. The lowest heat gain (+35 Wm^-2) occurs around the Tashiro Island, where the temperature difference between air and sea surface is lower and wind is stronger. The heat loss is larger during winter. From the AVHRR and SeaWiFS data, the offshore condition between the bay and Eno Island is differentiated by Ojika Peninsula, with varying dominant current. It is shown that the temporal behaviors of SSTs are closely connected with the air-sea heatflux and offshore condition.
阿武隈川の塩水遡上調査

金野修, 真野明, 田中仁, 澤本正樹

東北地域災害科学研究　36　221-226　2000
Observation for seawater intrusion at the Abukuma River

Konno O, Mano a, Tanaka H, Sawamato H

Tohoku Journal of Natural Disaster Science　36　221-226　2000
Transition of algae and seaweed on the artificial reef Peer-reviewed

Kimito Inoue, Hitoshi Tanaka, Osamu Nishimura, Ssatoshi Baba

Environmental Engineering Research　37　379-387　2000
Publisher: Japan Society of Civil Engineers
DOI： 10.11532/proes1992.37.379 　

ISSN： 1341-5115

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Several studies have been made on the effect of the artificial reef construction on the algae and seaweed. But little is known about the transition of the algae on the surface of newly constructed reef This paper is intended as an investigation of the transition of the algae and seaweed on the artificial reef in the Hirota bay. The results of this investigation showed that the transition of the ecosystem on the artificial reef could be showed by the index of diversity, and that the algae and seaweed on the artificial reef would be influenced by the wave and current around the artificial reef.
Experiments on turbulent transition in the bottom boundary layer under irregular waves Peer-reviewed

M.A. Samad, H. Tanaka, H. Yamaji

Annual Journal of Hydraulic Engineering JSCE　44　915-920　2000/01

DOI： 10.2208/prohe.44.915 　
Fine sand deposition on a floodplane during a flood Peer-reviewed

Norihiro Izumi, Sachiko MAtsuda, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering JSCE　44　419-424　2000/01

DOI： 10.2208/prohe.44.419 　
Observation of wave set-up height in a river mouth Peer-reviewed

Hitoshi Tanaka, Hisao Nagabayashi, Kenji Yamauchi

Coastal Engineering 2000 - Proceedings of the 27th International Conference on Coastal Engineering, ICCE 2000　276　X3458-3471　2000

DOI： 10.1061/40549(276)269 　
Velocity measurements in an oscillatory boundary layer under irregular waves Peer-reviewed

H Tanaka, MA Samad, H Yamaji

STOCHASTIC HYDRAULICS 2000　737-745　2000
Influence of Off-shore Oceanic Condition and Weather Variation on the Surface Temperature Condition in and around Sendai Bay Peer-reviewed

C. YANG, H. TANAKA, M. SAWAMOTO, K. HANAWA

Journal of Coastal Engineering, JSCE　46　1326-1330　1999/11
Publisher:
DOI： 10.2208/proce1989.46.1326 　

ISSN： 0916-7897
Analysis of Sea Surface Temperature Variability in the Coastal Area of the Northeast Japan Peer-reviewed

ChangSu YANG, Hitoshi TANAKA, Masaki SAWAMOTO, Kimio HANAWA

Proc. of International Symposium on Progress in Coastal Engineering and Oceanography　131-142　1999/09
Experimental study on non-linear wave boundary layers Peer-reviewed

H Tanaka, H Yamaji, A Sana

COASTAL ENGINEERING 1998, VOLS 1-3　471-483　1999
A multi-level model for nonlinear dispersive water waves Peer-reviewed

S Kanayama, H Tanaka, N Shuto

COASTAL ENGINEERING 1998, VOLS 1-3　576-588　1999
Inceptive topography of fluvial-dominated river mouth bars Peer-reviewed

N Izumi, H Tanaka, M Date

RIVER SEDIMENTATION: THEORY AND APPLICATIONS　899-904　1999
Estimating instantaneous turbulent bottom shear stress under irregular waves Peer-reviewed

Samad, M.A, Tanaka, H

Journal of Hydroscience and Hydraulic Engineering　17　((2))　107-126　1999
Depth-limited oscillatory boundary layers on a rough bottom Peer-reviewed

Tanaka, H, Sana, A, Kawamura, I, Yamaji, H

Coastal Engineering Journal　41　(1)　85-105　1999

DOI： 10.1142/S0578563499000061 　

ISSN： 2166-4250 1793-6292
Numerical investigation on irregular wave bottom boundary layer under laminar motion Peer-reviewed

MA Samad, H Tanaka

COASTAL ENGINEERING AND MARINA DEVELOPMENTS　3　193-202　1999

ISSN： 1462-6098
Influence of river mouth sand spit level on the time variation of river stage and bed topography Peer-reviewed

H Tanaka, MA Samad

COASTAL ENGINEERING AND MARINA DEVELOPMENTS　3　3-12　1999

ISSN： 1462-6098
Instability of river mouth locations in pocket beaches Peer-reviewed

N Izumi, N Shuto, H Tanaka

COASTAL SEDIMENTS '99, VOLS 1-3　628-643　1999
Experiments on bottom boundary layer under irregular wave Peer-reviewed

Samad, M.A, Tanaka, H, Yamaji, H

Proceedings of Coastal Engineering JSCE　46　21-25　1999
Publisher:
DOI： 10.2208/proce1989.46.21 　

ISSN： 0916-7897
Influence of weather and offshore conditions on the sea surface temperature environment in the coastal area of northeast Japan Peer-reviewed

Yang, C, Tanaka, H, Sawamoto, M, Hanawa, M

Proceedings of International Symposium on Progress in Coastal Engineering and Oceanography　1　131-142　1999
Field verification of an estimation method of cross-section at a river mouth Peer-reviewed

Tanaka, H, Takahashi, A

Proceedings of Civil and Environmental Engineering Conference　II-25-II-34　1999
Coastal Landform Variation due to Overtopping Waves Peer-reviewed

Tsuyoshi Nagasawa, Hitoshi Tanaka

Proceedings of Coastal Engineering JSCE　46　561-565　1999
Publisher:
DOI： 10.2208/proce1989.46.561 　

ISSN： 0916-7897
Bottom boundary layer properties under solitary waves Peer-reviewed

Samad, M.A, Tanaka, H

Proceedings of Civil and Environmental Engineering Conference　III-11-III-20　1999
Spectral analysis of Irregular wave boundary layers Peer-reviewed

Samad, M.A, Tanaka, H

Annual Journal Hydraulic Engineering JSCE　43　425-430　1999
A Boussinesq-Type Wave Model with Arbitrary-Order Dispersive Terms Peer-reviewed

Susumu Kanayama, Hitoshi Tanaka, Nobuo Shuto

Proceedings of Coastal Engineering JSCE　46　6-10　1999
Publisher:
DOI： 10.2208/proce1989.46.6 　

ISSN： 0916-7897
Measurement of wave set-up height in a river mouth Peer-reviewed

H.Tanaka, H.Nagabayashi, K.Yamauchi

Proceedings of Coastal Engineering, JSCE　45　436-440　1998/11
Publisher:
DOI： 10.2208/proce1989.45.436 　

ISSN： 0916-7897
Predictive model for grain size sorting along a coast Peer-reviewed

H.Tanaka, M.Suzuki

Proceedings of Coastal Engineering, JSCE　45　511-515　1998/11
Publisher:
DOI： 10.2208/proce1989.45.511 　

ISSN： 0916-7897
Separation of shoreline change caused by on-offshore and longshore sediment transports Peer-reviewed

T.Mori, H.Tanaka

Proceedings of Coastal Engineering, JSCE　45　551-555　1998/11
Publisher:
DOI： 10.2208/proce1989.45.551 　

ISSN： 0916-7897
Equilibrium height of sand spit formed by waves Peer-reviewed

N.Wada, H.Tanaka, H.Yamaji

Proceedings of Coastal Engineering, JSCE　45　596-600　1998/11
Publisher:
DOI： 10.2208/proce1989.45.596 　

ISSN： 0916-7897
Transitional behavior of bottom boundary layers under cnoidal wave motion Peer-reviewed

I.Kawamura, H.Tanaka, H.Yamaji, M.A.Samad

Proceedings of Coastal Engineering, JSCE　45　86-90　1998/11
Publisher:
DOI： 10.2208/proce1989.45.86 　

ISSN： 0916-7897
Bottom shear stress under irregular waves Peer-reviewed

M.A.Samad, H.Tanaka

Proceedings of Coastal Engineering, JSCE　45　91-95　1998/11
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.45.91 　

ISSN： 0916-7897
Measurement of Sea water circulation in Shizugawa Bay Peer-reviewed

G.Nagasawa, H.Tanaka, M.Matsumura, H.Yamaji

Proceedings of Coastal Engineering, JSCE　45　396-400　1998/11
Publisher:
DOI： 10.2208/proce1989.45.396 　

ISSN： 0916-7897
Complete closure at Nanakita River mouth Peer-reviewed

T.Inamura, H.Tanaka

Proceedings of Coastal Engineering, JSCE　45　(1)　601-605　1998/11

DOI： 10.2208/proce1989.45.601 　
Migration of river mouth due to sediment intrusion by waves Peer-reviewed

Tanaka, H, Murakami, K

Proceedings of 11th Congress APD-IAHR　737-745　1998/09
Oscillatory boundary layer under irregular waves Peer-reviewed

Mustafa Ataus Samad, Hitoshi Tanaka

Journal of Applied Mechanics　1　747-755　1998/08

DOI： 10.2208/journalam.1.747 　
Deltaic processes at the river mouth of the Abashiri River Peer-reviewed

Masanao Date, Norihiro Izumi, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering　42　1129-1134　1998/04

DOI： 10.2208/prohe.42.1129 　
Numerical study on bottom boundary layer under solitary waves Peer-reviewed

Mustafa Ataus Samad, Hitoshi Tanaka

Annual Journal of Hydraulic Engineering, JSCE　42　619-624　1998/03

DOI： 10.2208/prohe.42.619 　
A generation method of asymmetric oscillatory motion simulating cnoidal waves Peer-reviewed

Hitoshi Tanaka, Hiroto Yamaji, Ahmad Sana, Nobuo Shuto

Coastal Engineering Journal　40　(3)　291-306　1998
Publisher: World Scientific Publishing Co. Pte Ltd
DOI： 10.1142/S0578563498000170 　

ISSN： 0578-5634
Experimental and numerical investigation on asymmetric oscillatory boundary layers Peer-reviewed

Tanaka, H, Sana, A, Yamaji, H, Samad, M.A

Journal of Hydroscience and Hydraulic Engineering　16　(1)　117-126　1998

ISSN： 0912-2508
Theoretical and experimental investigation on laminar boundary layers under cnoidal wave motion Peer-reviewed

Hitoshi Tanaka, B. Mutlu Sumer, Carsten Lodahl

Coastal Engineering Journal　40　(1)　81-98　1998
Publisher: World Scientific Publishing Co. Pte Ltd
DOI： 10.1142/S0578563498000066 　

ISSN： 0578-5634
Theoretical and experimental study on quasi-steady boundary layer under wave motion Peer-reviewed

Hitoshi Tanaka, Ahmad Sana, Ikuo Kawamura

Journal of Hydraulics, Coastal and Environmental Engineering　593　(II-43)　155-164　1998
Publisher:
DOI： 10.2208/jscej.1998.593_155 　

ISSN： 0289-7806
Fundamental study on bottom boundary layer under irregular waves Peer-reviewed

M.A.Samad, H.Tanaka

Proc. of Civil Engineering in the Ocean　14　113-118　1998
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prooe.14.113 　

ISSN： 0912-7348

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Laminar boundary layer behavior under irregular wave motion has been investigated in this paper through numerical methods. The irregular wave velocity has first been generated and later used for flow computation in the boundary layer through low Reynolds number κ-ε model. The generation of irregular wave velocity shows a satisfactory result when compared with input spectral properties. Obtained k-ε model results have then been utilized for detailed analysis of time variation of bottom shear stress with freestream velocity. Model results show that the bottom shear stress is more dominated by high frequency component waves than that for velocity. It is also very sensitive to freestream velocity variations and does not always respond in the same way to similar velocity conditions. A comparison of irregular wave bottom shear stress with that of monochromatic waves shows that the significant bottom shear stress closely corresponds to that of sinusoidal wave computed with the highest two-third of wave heights (H_2/3).
Numerical model of Topography change at a small river mouth Peer-reviewed

K.Yamauchi, H.Tanaka

Proceedings of Coastal Engineering, JSCE　45　451-455　1998
Publisher:
DOI： 10.2208/proce1989.45.451 　

ISSN： 0916-7897
Numerical experiment on broken wave bottom boundary layer Peer-reviewed

Samad, M.A, Tanaka, H

Flow Modeling and Turbulence Measurements VII　7　39-46　1998
Computation of unsteady flow with a sudden expansion Peer-reviewed

Tanaka, H, Hayashi, Y

Flow Modeling and Turbulence Measurements VII　7　391-398　1998
Inception of river mouth terraces due to bedload and suspended load deposition Peer-reviewed

Masanao Date, Norihiro Izumi, Hitoshi Tanaka

Proceedings of Coastal Engineering, JSCE　44　591-595　1997/11
Publisher:
DOI： 10.2208/proce1989.44.591 　

ISSN： 0916-7897
Improvement of the full-range equation for bottom friction under three-dimensional wave-current combined motion Peer-reviewed

S Ahmad, H Tanaka

COASTAL ENGINEERING　31　(1-4)　217-229　1997/07

DOI： 10.1016/S0378-3839(97)00007-0 　

ISSN： 0378-3839
Numerical Simulation of flow with a sudden expansion Peer-reviewed

Y.Hayashi, H.Tanaka

Proceedings of Coastal Engineering, JSCE　44　31-35　1997
Publisher:
DOI： 10.2208/proce1989.44.31 　

ISSN： 0916-7897
Sediment intrusion into a lagoon due to overtopping waves Peer-reviewed

H.Tanaka, K.Yamauchi

Proceedings of Coastal Engineering, JSCE　44　646-650　1997

DOI： 10.2208/proce1989.44.646 　
Effect of sand spit on water level rise in a river mouth Peer-reviewed

K.Yamauchi, H.Tanaka

Proceedings of Coastal Engineering, JSCE　44　441-445　1997
Publisher:
DOI： 10.2208/proce1989.44.441 　

ISSN： 0916-7897
Transitional behavior of asymmetric oscillatory boundary layers Peer-reviewed

A.Sana, H.Tanaka, H.Yamaji

Annual Journal of Hydraulic Engineering　41　651-656　1997

DOI： 10.2208/prohe.41.651 　
A New Generation Method of Asymmetric Oscillatory Flow Peer-reviewed

H.Tanaka, H.Yamaji, A.Sana, N.Shuto

Journal of JSCE　565　(II-39)　111-118　1997
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.1997.565_111 　

ISSN： 0289-7806

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A simple and inexpensive system is developed to generate an asymmetric oscillatory flow in a closed conduit, which simulates sea-bottom boundary layer induced by cnoidal waves. Easy-to-invoke modifications in the system may produce asymmetry of waves about horizontal as well as vertical axis, producing a wave profile encountered in the surfzone. The relations have been established between theoretical quantities and system parameters in order to facilitate practical application of the present system. Preliminary experiments have been carried out to check the validity of the system and excellent agreement has been found between theory and experiments.
Theoretical and Experimental Investigation on Laminar Boundary Layer Peer-reviewed

H.Tanaka, B.M.Sumer, J.Fredsoe

Journal of JSCE　572　(II-40)　85-90　1997
Publisher:
DOI： 10.2208/jscej.1997.572_85 　

ISSN： 0289-7806
Field application of a numerical model for river mouth topography change Peer-reviewed

H Tanaka, N Kuwahara, K Sato, N Shuto

COMPUTER MODELLING OF SEAS AND COASTAL REGIONS III - COASTAL 97　151-160　1997
The variation of frictional resistance under long waves in cross-shore direction Peer-reviewed

H Tanaka, A Sana

COMPUTER MODELLING OF SEAS AND COASTAL REGIONS III - COASTAL 97　233-242　1997
The modes of sediment transport under pulsatile motion Peer-reviewed

H.Tanaka, A.Sana, M.A.Samad

Proceedings of 4th International Conference on Measurement and Control of Granular Material　160-165　1997
Stability of an asymmetric oscillatory flow Peer-reviewed

I..Kawamura, H.Tanaka, H.Yamaji, A.Sana

Proceedings of Coastal Engineering, JSCE　44　136-140　1997
Publisher:
DOI： 10.2208/proce1989.44.136 　

ISSN： 0916-7897
Field investigation on sand spit height at a river mouth Peer-reviewed

N.Wada, H.Tanaka

Proceedings of Coastal Engineering, JSCE　44　596-600　1997

DOI： 10.2208/proce1989.44.596 　
Geometry of Sand Ripples due to Wave-current Co-existent Flows Peer-reviewed

H.Tanaka, D.Vanto

Journal of Waterway, Port, Coastal and Ocean Engineering　122　(6)　298-300　1996/06

DOI： 10.1061/(ASCE)0733-950X(1996)122:6(298) 　
The testing of low Reynolds number k-epsilon models by DNS data for an oscillatory boundary layer Peer-reviewed

A Sana, H Tanaka

FLOW MODELING AND TURBULENCE MEASURMENTS VI　363-370　1996
Numerical modeling of 2-D flow and sediment movement in the vicinity of Natori River mouth Peer-reviewed

H Tanaka, N Shuto, N Kuwahara, K Sato

FLOW MODELING AND TURBULENCE MEASURMENTS VI　813-820　1996
An Estimation Method of Gorge Section at a Small River Mouth Peer-reviewed

H.Tanaka, T.Ito

Coastal Engineering in Japan　39　(1)　27-38　1996

DOI： 10.1080/05785634.1996.11952819 　
Complete closure at the Nanakita River mouth in 1995 Peer-reviewed

H.Tanaka, F.Takahashi, A.Takahashi

Proceedings of 25th International Conference on Coastal Engineering　4545-4556　1996
A comparative study of low Reynolds number models based on wave-current combined action Peer-reviewed

A. Sana, H.Tanaka

Proceedings of 10th APD-IAHR Congress　486-493　1996
Field application of a numerical model for river mouth topography change Peer-reviewed

Kuwahara, N, Tanaka, H, Sato, K, Shuto, N

Proceedings of Japanese conference on hydraulics　40　953-958　1996

DOI： 10.2208/prohe.40.953 　
Bottom shear stress prediction for three dimensional wave-current boundary layers Peer-reviewed

Tanaka, H, Sana, A

Proceedings of JSCE　533　(34)　273-277　1996
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.1996.533_273 　

ISSN： 0289-7806

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The maximum and mean shear stress in the case of three dimensional wave-current coexistent motion are predicted by the full-range equations of Tanaka and Thu (1993). The latest available experimental data are utilized for the comparison. A modification is proposed to improve the predicting capability of the full-range equation in the transitional region.
The Performance of low Reynolds number k-εmodel to analyze an oscillatory boundary layer Peer-reviewed

Sana, A, Tanaka, H

Proceedings of Japanese conference on hydraulics　40　779-785　1996

DOI： 10.2208/prohe.40.779 　
An Exploration of the Quasi-Steady Features in Low Frequency Oscillations Peer-reviewed

I..Kawamura, A.Sana, H.Tanaka

Proceedings of Coastal Engineering, JSCE　43　451-455　1996

DOI： 10.2208/proce1989.43.451 　
Topography Change at a River Mouth due to Estimated High-Water Discharge Peer-reviewed

N.Kuwahara, H.Tanaka

Proceedings of Coastal Engineering, JSCE　43　631-635　1996

DOI： 10.2208/proce1989.43.631 　
Field Application of an Estimation Method of Gorge Section at a River Mouth Peer-reviewed

A.Takahashi, H.Tanaka

Proceedings of Coastal Engineering, JSCE　43　636-640　1996
Publisher:
DOI： 10.2208/proce1989.43.636 　

ISSN： 0916-7897
Estimation of the Vertical Distribution of Sea Temperature along Sanriku Coast Peer-reviewed

J.Fukuwatari, H.Tanaka, N.Shuto

Proceedings of Coastal Engineering, JSCE　43　1196-1200　1996
Publisher:
DOI： 10.2208/proce1989.43.1196 　

ISSN： 0916-7897
The quasi-steady behavior of wave boundary layer Peer-reviewed

H.Tanaka, A.Sana, I.Kawamura, H.Yamaji

Proceedings of 10th APD-IAHR　381-388　1996
INITIAL MOTION OF SEDIMENT UNDER WAVES AND WAVE-CURRENT COMBINED MOTIONS Peer-reviewed

H TANAKA, DV TO

COASTAL ENGINEERING　25　(3-4)　153-163　1995/07

DOI： 10.1016/0378-3839(94)00047-2 　

ISSN： 0378-3839

eISSN： 1872-7379
Field measurement of topography change at the Nanakita River mouth Peer-reviewed

Tanaka and H

Journal of JSCE　509　(II-30)　169-181　1995
Publisher:
DOI： 10.2208/jscej.1995.509_169 　

ISSN： 0289-7806
Quasi-steady property of bottom friction in a wave boundary layer Peer-reviewed

Tanaka and H

Proc. of Japanese conference on hydraulics　39　857-862　1995
Numerical simulation of the sand spit flushing at the River mouth Peer-reviewed

K.Sato, N.Shuto, H.Tanaka

Proc. of Hydro-Science and -Engineering　1399-1406　1995
Time-varying bottom friction due to waves and current interacting at an arbitrary angle Peer-reviewed

Tanaka, H, Thu, A

Proc. of Civil Engineering in the Ocean　11　49-54　1995
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prooe.11.49 　

ISSN： 0912-7348

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A simple method is proposed to calculate an instantaneous bottom shear stress under waves and current crossing at an arbitrary angle, on the basis of the theoretical study of Tanaka and Shuto (1981). Although the exact solution derived Tanaka and Shuto is expressed in terms of the complex-valued Bessel functions, the approximate solution presented in this study is very simple with reasonable accuracy. This method can, therefore, be extensively applied to practical coastal problems such as sediment transport and wave energy attenuation under coexistence of waves and current.
A full-range equation for wave boundary layer thickness Peer-reviewed

Sana, A, Tanaka

Advances in Hydro-Science and -Engineering　1487-1494　1995
Suspension of mixed sand under wave motion Peer-reviewed

Tanaka, H, Yang, D

Proceedings of the 2nd International Conference on Multiphase Flow　EN-17-EN-23　1995
Numerical simulation of velocity field and sand movement at a river mouth during a flood Peer-reviewed

Tanaka, H, Okabe, K, Shuto, N

Proceedings of the 2nd International Conference on Multiphase Flow　P9-13-P9-20　1995
Numerical model for predicting the seasonal migration of a river mouth Peer-reviewed

H TANAKA, H KABUTOYAMA, N SHUTO

COMPUTER MODELLING OF SEAS AND COASTAL REGIONS II　345-352　1995
Short-term shoreline change on Sendai Coast Peer-reviewed

H TANAKA, A TAKAHASHI

COMPUTER MODELLING OF SEAS AND COASTAL REGIONS II　205-212　1995
Application of low Reynolds number kappa-epsilon model to wave-current combined motion Peer-reviewed

A SANA, H TANAKA

COMPUTER MODELLING OF SEAS AND COASTAL REGIONS II　213-220　1995
Quasi-steady characteristics of a wave boundary layer in cross-shore direction Peer-reviewed

Tanaka, H, Sana, A

Proceedings of Coastal Engineering, JSCE　42　36-40　1995

DOI： 10.2208/proce1989.42.36 　
The modes of sediment transport under wave-current combined motion modes of sediment movement Peer-reviewed

Sana, A, Tanaka, H, Van To, D

Proceedings of Coastal Engineering, JSCE　42　491-495　1995
Publisher:
DOI： 10.2208/proce1989.42.491 　

ISSN： 0916-7897
Complete closure of the Nanakita River mouth in 1994 Peer-reviewed

Takahashi, F, Tanaka, H, Takahashi, J

Proceedings of Coastal Engineering, JSCE　42　586-590　1995
Numerical modelling of 2-D flow and sediment movement in the vicinity of Natori River mouth Peer-reviewed

Kuwahara, N, Tanaka, H, Sato, K, Shuto, N

Proceedings of Coastal Engineering, JSCE　42　596-600　1995
Publisher:
DOI： 10.2208/proce1989.42.596 　

ISSN： 0916-7897
Numerical model of the sand spit flushing at a river mouth during a flood Peer-reviewed

Tanaka, H, Kuwahara, N

Proceedings of HYDROCOAST 95　194-203　1995
The performance of a low Reynolds k-ε model to analyze an oscillatory boundary layer Peer-reviewed

Sana, A, Tanaka, H

Proceedings of International Symposium on Mathematical Modeling　291-296　1995
FULL-RANGE EQUATION OF FRICTION COEFFICIENT AND PHASE DIFFERENCE IN A WAVE CURRENT BOUNDARY-LAYER Peer-reviewed

H TANAKA, A THU

COASTAL ENGINEERING　22　(3-4)　237-254　1994/02

DOI： 10.1016/0378-3839(94)90038-8 　

ISSN： 0378-3839
Application of the low Reynolds number k-e models to an oscillatory flow Peer-reviewed

H.Tanaka, A.Sana

Proc. of Japanese conference on hydraulics　38　481-486　1994
Quasi-steady property of bottom friction in a wave boundary layer Peer-reviewed

H. Tanaka, N. Shuto

Proc. of the International Symposium:Waves-Physical and numerical modelling　1570-1579　1994
Estimation of surface current velocity off the Sanriku Coast Peer-reviewed

J. Fukuwatari, X. Zhang, H. Tanaka, N. Shuto

Proceedings of Coastal Engineering, JSCE　41　286-290　1994

DOI： 10.2208/proce1989.41.286 　
Seasonal migration of the Nanakita river mouth Peer-reviewed

H. Kabutoyama, H. Tanaka, N. Shuto

Proceedings of Coastal Engineering, JSCE　41　456-460　1994
Publisher:
DOI： 10.2208/proce1989.41.456 　

ISSN： 0916-7897
Production and Transportation of Cohesive Sediment due to Rainfall Peer-reviewed

X.Zhang, N.Shuto, H.Tanaka

Proc. of Japanese conference on hydraulics　38　259-264　1994
Seawater exchange in Shizugawa Bay Peer-reviewed

H. Horii, H. Tanaka, K. Watanabe, N. Shuto

Proceedings of Coastal Engineering, JSCE　41　1091-1095　1994

DOI： 10.2208/proce1989.41.1091 　
Prediction of shoreline change and grain-size sorting at the Sendai Coast Peer-reviewed

H. Tanaka, M. Suzuki

Proc. of EUROMECH 310/Sediment Transport Mech. and Coastal Envir. and rivers　14-25　1994
Numerical study on transition to turbulence in a wave boundary layer Peer-reviewed

H. Tanaka, A. Sana

Proc. of EUROMECH 310/Sediment Transport Mech. and Coastal Envir. and Rivers　167-181　1994
Incipient motion of sediment particles under wave motion Peer-reviewed

H. Tanaka, V. T. Dang

Proc. of 9th Congress of APD-IAHR　3-10　1994
Prediction of cross-sectional area at a river mouth Peer-reviewed

B. S. Eko, H. Tanaka

Proc. of 9th Congress of APD-IAHR　42-49　1994
Prediction of bottom shear stress for the confluence of steady and oscillatory flow. Peer-reviewed

A.Sana, H.Tanaka

Proceedings of Coastal Engineering, JSCE　41　416-420　1994

DOI： 10.2208/proce1989.41.416 　
Numerical simulation of the sand spit flushing at the Natori River Mouth. Peer-reviewed

N.Kuwahara, H.Tanaka

Proceedings of Coastal Engineering, JSCE　41　501-505　1994
Publisher:
DOI： 10.2208/proce1989.41.501 　

ISSN： 0916-7897
Time-varying bottom friction due to waves and current interacting at an arbitary angle Peer-reviewed

H.Tanaka, A.Thu

Coastal Engineering in Japan　37　(2)　137-151　1994

DOI： 10.1080/05785634.1994.11952797 　
An estimation method of the narrowest cross section at the river mouth. Peer-reviewed

T.Ito, H.Tanaka

Proceedings of Coastal Engineering, JSCE　41　461-465　1994
Publisher:
DOI： 10.2208/proce1989.41.461 　

ISSN： 0916-7897
Prediction of shoreline change and grain-size sorting at the Sendai Coast

H. Tanaka, M. Suzuki

Proc. of EUROMECH 310/Sediment Transport Mechanisn & Coastal Env ironments and Rivers　1993/09
Experimental and Theoretical Study on Scouring of Sand Bars by Overflowing Water Peer-reviewed

X. Shao, H. Tanaka, N. Shuto

Proceedings of JSCE　(#N479/II-25)　31-40　1993
Publisher:
DOI： 10.2208/jscej.1993.479_31 　

ISSN： 0289-7806
Bed shear stress under waves and current with a smooth bottom Peer-reviewed

H. Tanaka, A. Thu

Advances in Hydyo-Science and -Engineering　1461-1466　1993
Sand terrace formation in front of a small river mouth due to flush flood Peer-reviewed

H.Tanaka, K.Suga

Advances in Hydro-Science and -Engineering　1731-1736　1993
NUMERICAL-SIMULATION OF SAND TERRACE FORMATION IN FRONT OF A RIVER MOUTH Peer-reviewed

H TANAKA, Q HUIMIN

COMPUTATIONAL MODELLING OF FREE AND MOVING BOUNDARY PROBLEMS II　241-248　1993
Wave set-up measured in a river mouth Peer-reviewed

H. Tanaka, D. Puzari

Proceeding of 11th Australasian Conference on Coastal and Ocean Engineering　695-700　1993
Computation of Topography Change at a river Mouth during a Flood Peer-reviewed

Hitoshi Tanaka, Huimin Qin

Proceedings of Coastal Engineering, JSCE　40　476-480　1993
Publisher:
DOI： 10.2208/proce1989.40.476 　

ISSN： 0916-7897
Wave-Current Friction Laws Spanning All Flow Regions Peer-reviewed

H. Tanaka, A. Thu

Proceedings of JSCE　(#N467/II-23)　93-102　1993
Publisher:
DOI： 10.2208/jscej.1993.467_93 　

ISSN： 0289-7806
Interaction of waves and current ( Part I: Experimental Investigation ) Peer-reviewed

S. Seree, H.Tanaka, N.Shuto

Coastal Engineering in Japan Vol.35 No.2　167-186　1992

DOI： 10.1080/05785634.1992.11924564 　

ISSN： 0578-5634
Interactions of waves and current ( Part II : Numerical Computation ) Peer-reviewed

S. Seree, H. Tanaka, N. Shuto

Coastal Engineering in Japan Vol.35 No.2　187-204　1992

DOI： 10.1080/05785634.1992.11924565 　

ISSN： 0578-5634
Rough-Turbulent Boundary Layer in Wave-Current Combined Motion Peer-reviewed

S.Supharatid, H.Tanaka, N.Shuto

Proc. of Japanese conference on hydraulics　36　193-198　1992

DOI： 10.2208/prohe.36.193 　
An explicit expression of friction coefficient for a wave-current coexistent motion Peer-reviewed

H.Tanaka

Coastal Engineering in Japan　35　(1)　83-91　1992

DOI： 10.1080/05785634.1992.11924559 　
Field investigation at a mouth of small river Peer-reviewed

H. Tanaka, N. Shuto

Proceedings of 23rd International Conference on Coastal Engineering　2486-2499　1992
Interaction of nonlinear waves and current Peer-reviewed

S. Seree, H. Tanaka, N. Shuto

Proceedings of 23rd International Conference on Coastal Engineering　672-683　1992
A Study on the velocity distribution under wave-current combined motions Peer-reviewed

S.Superladid, H.Tanaka, N.Shuto

Proceedings of Coastal Engineering, JSCE　38　6-10　1991
Publisher:
DOI： 10.2208/proce1989.38.6 　

ISSN： 0916-7897
BEDLOAD TRANSPORT OF NONUNIFORM SAND DUE TO WAVES AND CURRENT Peer-reviewed

H TANAKA, T YOSHITAKE, N SHUTO

SAND TRANSPORT IN RIVERS, ESTUARIES AND THE SEA　45-49　1991
Field Measurement of the Complete Closure at the Nanakita River Mouth in Japan Peer-reviewed

H.Tanaka, N.Shuto

Natural Disaster Reduction and Civil Eng., JSCE Kansai Chapter　67-76　1991
Erosion of Sand Bars by Overflowing River Discharge Peer-reviewed

X.M.Shao, H.Tanaka, N.Shuto

Natural Disaster Reduction and Civil Eng., JSCE Kansai Chapter　97-105　1991
Flash and river mouth close at Nanakita river Peer-reviewed

H.Tanaka

Proc. of Japanese conference on hydraulics　35　275-280　1991

DOI： 10.2208/prohe.35.275 　
Field Measurement at the Mouth of Nanakita River Peer-reviewed

H.Tanaka, A.Ito, N.Shuto

Proceedings of Coastal Engineering, JSCE　38　361-365　1991
Publisher:
DOI： 10.2208/proce1989.38.361 　

ISSN： 0916-7897
Scouring of Sand Bars due to Non-equilibrium Sediment Transport Peer-reviewed

X.M.Shao, H.Tanaka, N.Shuto

Proc. of Japanese conference on hydraulics　35　435-440　1991

DOI： 10.2208/prohe.35.435 　
Experimental Investigation on Uniform and Non-Uniform Boundary Layer under Wave-Current Combinations Peer-reviewed

S.Supradid, H.Tanaka, N.Shuto

Proc. of Japanese conference on hydraulics　35　537-542　1991

DOI： 10.2208/prohe.35.537 　
Field Measurement of Topography and Hydraulic Characteristics at the Nanakita River Mouth Peer-reviewed

H. Tanaka, T. Ito, N. Shuto

Proceedings of Coastal Engineering, JSCE　37　334-338　1990
Publisher:
DOI： 10.2208/proce1989.37.334 　

ISSN： 0916-7897
Experimental Study on Scouring of a Sand Bar by Overflow Peer-reviewed

S.Shou, H.Tanaka, N.Shuto

Proc. of Japanese conference on hydraulics　34　373-378　1990
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/prohe.34.373 　

ISSN： 0916-7374

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Velocities and bottom shear stresses are measured, by an LDV, in flows over fixed-bed models, which correspond to instantaneous shapes of a sand bar during scouring. Two bed load tran sport formulas in non-equilibrium state are obtained in terms of the measured shear velocity with corrections of the effect of slope; one for erosion and the other for deposit. An empirical coefficient K_B in the equation of motion for sand is determined to be 0.02cm^-1.
An Explicit Expression of a Friction Coefficient for a Wave-Current Coexisting Motion Peer-reviewed

H. Tanaka

Journal of JSCE　417　(417)　188-191　1990
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.1990.417_285 　

ISSN： 0289-7806

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In a previous paper (1980), the author derived analytically a friction coefficient for a wave-current coexisting motion as well as its approximation for practical use. This approximate formula is, however, given in an implicit form so that an iteration is always needed in the calculation. The present paper proposes an approximate formula in an explicit expression. The accuracy is found to be within 3% compared with the exact solution, better than that of the previous approximate formula. The persent formula is thereby useful in reducing the number of arithmatric operation in computer programs.
FIELD MEASUREMENT OF TOPOGRAPHY AT A RIVER MOUTH Peer-reviewed

H TANAKA, N SHUTO

SEDIMENT TRANSPORT MODELING　480-485　1989
Sorting of mixed sand on a two-dimensional beach Peer-reviewed

Hitoshi Tanaka

Proceedings of Third National Conference on Hydraulic Engineering　3　95-100　1989
Numerical simulation of armor coat formation under wave-current combined motion Peer-reviewed

H.Tanaka, T.Yoshitake, N.Shuto

Proceedings of Coastal Engineering, JSCE　36　264-268　1989
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/proce1989.36.264 　

ISSN： 0916-7897
BOTTOM BOUNDARY-LAYER UNDER NONLINEAR-WAVE MOTION Peer-reviewed

H TANAKA

JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE　115　(1)　40-57　1989/01

DOI： 10.1061/(ASCE)0733-950X(1989)115:1(40) 　

ISSN： 0733-950X
Bed Load Transport of Sediment with Non-uniform Grain Size due to Wave Motion Peer-reviewed

H.Tanaka

Coastal Engineering in Japan　31　(2)　265-276　1988

DOI： 10.1080/05785634.1988.11924497 　
Bed Load Trasport due to non-linear wave motion Peer-reviewed

H.Tanaka

Proceedings of 21st International Conference on Coastal Engineering　1803-1817　1988
Transport of Bed Load with Non-uniform Grain Size Peer-reviewed

H.Tanaka, Y.Katayama, M.Kaga, T.Suga

Proceedings of Coastal Engineering, JSCE　35　307-311　1988

DOI： 10.2208/proce1970.35.307 　
Formation of Sand Terrace in front of a river mouth and Its decline Peer-reviewed

K.Suga, T.Ishikawa, K.Nadaika, H.Tanaka

Journal of JSCE　381　(381)　227-230　1987
Publisher:
ISSN： 0289-7806
Formation of sand bar in front of a river mouth Peer-reviewed

H.Tanaka, K.Suga, H.Takayama, H.Hatori

Proc. of Hydraulic Conference　31　737-742　1987

DOI： 10.2208/prohe1975.31.737 　
Studies on Water Particle Velocity and bottom shear stress under Non-linear Wave with an arbitrary profile Peer-reviewed

H.Tanaka

Journal of JSCE　381　(381)　181-187　1987
Publisher:
DOI： 10.2208/jscej.1987.381_181 　

ISSN： 0289-7806
Velocity measurements of wave-current combined motion over an asymmetric rippled bed Peer-reviewed

H. Tanaka, N. Shuto

Coastal Sediments '87　379-392　1987
Sediment Transport Rate Due to Non-liner Wave Motion Peer-reviewed

H.Tanaka, M.Yoshida, K.Tsukahara, K.Suga

Proceedings of Coastal Engineering, JSCE　34　232-236　1987
Publisher:
DOI： 10.2208/proce1970.34.232 　

ISSN： 0285-7308
A Comformal Mapping of a finite region bounded by wavy walls Peer-reviewed

H.Tanaka

Journal of JSCE　369　(369)　319-323　1986/05
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscej.1986.369_319 　

More details Close

A conformal mapping of a finite region bounded by wavy boundaries is proposed. A modification leads to a transform function of the semi-infinite region over an asymmetric rippled bed. The technique can be extensively applied to the analysis of the two-dimensional fluid motion bounded by wavy boundaries.
Turbulence structure and bed friction under waves and current interacted motion Peer-reviewed

H.Tanaka

Proc. of the Thiard Int. Sym. on River Sedimentation　III, S.Y. Wang; H.W. Shen; L.Z. Ding　((eds.), University, U.S.A., Mississippi Univ., 1986, Session III, p.334-343.)　334-343　1986
Runoff characteristics due to Agricultural Refinement Peer-reviewed

M.Hasebe, H.Tanaka, K.Suga

Proc. of Hydraulic Conference　30　139-143　1986

DOI： 10.2208/prohe1975.30.139 　
Experimental Study on sea bottom change around jetties Peer-reviewed

H.Tanaka, Y.Suzuki, K.Suga

Proceedings of Coastal Engineering, JSCE　33　257-261　1986
Publisher:
DOI： 10.2208/proce1970.33.257 　

ISSN： 0285-7308
Bottom Shear Stress and Turbulence Intensity in a Wave-Current coexisting Boundary Layer Peer-reviewed

Hitoshi Tanaka

Proceedings of Coastal Engineering, JSCE　32　31-35　1985/11
Publisher:
DOI： 10.2208/proce1970.32.31 　

ISSN： 0285-7308
Runoff characteristics due to Agricultural Refinement Peer-reviewed

K.Suga, T.Nakao, M.Hasebe, H.Tanaka

Proc. of Japanese conference on hydraulics　29　31-35　1985

DOI： 10.2208/prohe1975.29.31 　
Stable Sectional Area of A River Mouth Balanced by Flow and Wave Action Peer-reviewed

H.Tanaka, K.Suga

Proc. of Japanese conference on hydraulics　29　573-578　1985

DOI： 10.2208/prohe1975.29.573 　
Friction Laws and Flow Regimes under Wave and Current Motions Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Journal of JSCE　342　(342)　61-69　1984
Publisher:
DOI： 10.2208/jscej1969.1984.342_61 　

ISSN： 0385-5392
Sand Movement due to Wave-current Combined Motion Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Coastal Engineering in Japan　27　179-191　1984

DOI： 10.1080/05785634.1984.11924386 　

ISSN： 0578-5634
FRICTION LAWS AND FLOW REGIMES UNDER WAVE AND CURRENT MOTION Peer-reviewed

H TANAKA, N SHUTO

JOURNAL OF HYDRAULIC RESEARCH　22　(4)　245-261　1984

DOI： 10.1080/00221688409499382 　

ISSN： 0022-1686
Experimental Study on Oscillatory Flow Accompanied with Unidirectional Flow Wavy Bottom Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Proc.the Japanese Conference on Coastal Engineering　31　301-305　1984
Publisher:
DOI： 10.2208/proce1970.31.301 　

ISSN： 0285-7308
On-off-shore Sediment Transport due to Wave and Current Peer-reviewed

Isao Sato, Hitoshi Tanaka, Nobuo Shuto

Proc.the Japanese Conference on Coastal Engineering　31　311-315　1984
Publisher:
DOI： 10.2208/proce1970.31.311 　

ISSN： 0285-7308
Sand Movement under Wave-current Combined Effects Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Proc. of Japanese conference on hydraulics　28　137-142　1984

DOI： 10.2208/prohe1975.28.137 　
Experiments of an Oscillatory Flow Accompanied with a Unidirectional Motion Peer-reviewed

Hitoshi Tanaka, Siew Chain Chang, Nobuo Shuto

Coastal Engineering in Japan　26　19-37　1983

DOI： 10.1080/05785634.1983.11924356 　
Eddy viscosity in an oscillatory current with a unidirectional flow Peer-reviewed

Hitoshi Tanaka, Siew Chain Chang, Nobuo Shuto

Proc.theJapanese Conference on Coastal Engineering　30　199-203　1983
Publisher:
DOI： 10.2208/proce1970.30.199 　

ISSN： 0285-7308
Experimental Study on an Oscillatory Flow Accompanied with a Steady Flow Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Proc.the Japanese Conference on Coastal Engineering　29　259-263　1982/11
Publisher:
DOI： 10.2208/proce1970.29.259 　

ISSN： 0285-7308
Hydraulic Characteristics Measured at the Mouth of Same River Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Proc.the Japanese Conference on Coastal Engineering　28　535-539　1981/11
Publisher:
DOI： 10.2208/proce1970.28.535 　

ISSN： 0285-7308
Hydraulic characteristics measured at the mouth of Same River in Japan Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Proc. of 5th Conference on Ocean Engineering in Republic of China　377-395　1981/09
Friction coefficient for a wave-current coexitent system Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Coastal Engineering in Japan　105-128　1981

DOI： 10.1080/05785634.1981.11924323 　

ISSN： 0578-5634
Exprimental study on wave-current coexistent flow Peer-reviewed

Hitoshi Tanaka, Nobuo Shuto

Proceedings of 27th Annual Conference on Coastal Engineering　27　163-167　1980/11

DOI： 10.2208/proce1970.27.163

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Misc. 122

Estimation of Floodwater Depth in Quang Tri Province using Sentinel-1 Data

Vuong Tai CHI, Dinh Nhat QUANG, Nguyen Xuan TINH, Hitoshi TANAKA

Tohoku Journal of Natural Disaster Science　58　99-104　2022/03
Assessment of River Mouth Variability After Jetty and Groyne Construction: A Case Study of The Volta River Mouth, Ghana

Stephan Korblah LAWSON, Hitoshi TANAKA, Keiko UDO, Nguyen Trong HIEP, Nguyen Xuan TINH

Tohoku Journal of Natural Disaster Science　58　111-116　2022/03
Shoreline change and impacts of coastal protection structures on Da Rang River mouth and adjacent coast, south central of Vietnam

Nguyen Trong Hiep, Hitoshi Tanaka, Nguyen Xuan Tinh, Nguyen Trung Viet

Tohoku Journal of Natural Disaster Science　58　105-110　2022/03
Hydraulic model experiment on structural resistiveness against tsunami action of port side armor block of sloping breakwater

高橋研也, 田中仁

東北地域災害科学研究　57　2021
傾斜堤の港内側被覆ブロックの耐津波特性に関する実験的研究—AN EXPERIMENTAL STUDY ON STRUCTURAL RESISTIVENESS AGAINST TSUNAMI ACTION OF PORT SIDE ARMOR BLOCK OF SLOPING BREAKWATER

高橋研也, 田中仁

海洋開発シンポジウム講演集　46　6p　2021
Publisher: [東京] : 土木学会海洋開発委員会
波動レイノルズ数を用いた津波底面境界層の層流-乱流遷移の検討

田中仁, Tinh Nguyen Xuan, 中村優一

津波工学研究報告 = Tsunami engineering = research report of tsunami engineering　(37)　47-49　2020/07
Publisher: 東北大学災害科学国際研究所(津波工学研究分野)
ISSN： 0916-7099
東日本大震災津波後の河口地形回復の遅延

Hiep Nguyen Trong, 田中仁, Tinh Nguyen Xuan

津波工学研究報告 = Tsunami engineering = research report of tsunami engineering　(37)　63-66　2020/07
Publisher: 東北大学災害科学国際研究所(津波工学研究分野)
ISSN： 0916-7099
Development of bottom boundary layer under shoaling solitary wave

Hitoshi Tanaka, Tinh Nguyen Xuan, Ryo Nishiwaki, Kazuya Watanabe

Tohoku Journal of Natural Disaster Science　56　51-56　2020/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Morphology recovery and prevailing sediment transport along sand spit at the Kitakami River mouth after the 2011 Tsunami

Hiep Nguyen Trong, Tanaka Hitoshi, Tinh Nguyen Xuan

Tohoku Journal of Natural Disaster Science　56　75-80　2020/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
津波の下での底面せん断力特性

Tinh Nguyen Xuan, 田中仁, 宋文正

津波工学研究報告 = Tsunami engineering = research report of tsunami engineering　(36)　119-125　2019/07
Publisher: 東北大学災害科学国際研究所(津波工学研究分野)
ISSN： 0916-7099
Analysis of salinity flow in a shallow brackish lake

Mika Tanaka, Makoto Umeda, Hitoshi Tanaka, Tetsuya Shintani

Tohoku Journal of Natural Disaster Science　54　2018
Study on Recovery Process of Bathymetry of Sendai Bay after the 2011 Tsunami

Shintaro Saegusa, Hitoshi Tanaka, Yuta Mitobe

Tohoku Journal of Natural Disaster Science　53　15-19　2017/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Observation of sand spit development at Cua Lo River mouth, Central Vietnam

Duy Dinh Van, Tanaka Hitoshi, Mitobe Yuta, Viet Nguyen Trung

Tohoku Journal of Natural Disaster Science　53　71-76　2017/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
High-frequency UAV monitoring of beach and wave

Akihiro Suzuki, Yuta Mitobe, Hitoshi Tanaka

Tohoku Journal of Natural Disaster Science　53　59-64　2017/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Analysis of erosion and accretion waves on Cua Dai Beach in Central Vietnam

Duy Dinh Van, Tanaka Hitoshi, Mitobe Yuta, Viet Nguyen Trung, Binh Le Thanh

Tohoku Journal of Natural Disaster Science　53　53-58　2017/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Study on energy dissipation in WAM model

Tsuyoshi Kotoura, Hitoshi Tanaka

Tohoku Journal of Natural Disaster Science　53　33-38　2017/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Tsunami Propagation into Rivers and Reduction of Riverine Tsunami Disasters

Hitoshi Tanaka

Summer Seminar on Hydraulic Engineering, JSCE, 2016, Course B　2016/08/20
Publisher: JSCE
Long-term morphological change on Darang Coast, Vietnam

Nguyen Trong Hiep, Tanaka Hitoshi, Mitobe Yuta

Tohoku Journal of Natural Disaster Science　52　145-150　2016/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Temporal variation of shoreline positions on Cua Dai beach, Vietnam

Dinh Van Duy, Tanaka Hitoshi, Mitobe Yuta

Tohoku Journal of Natural Disaster Science　52　151-156　2016/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Estuarine morphological changes due to the 2015 Kanto-Tohoku Heavy Rainfall and their subsequent recovery

Hitoshi Tanaka, Yuta Mitobe, Hoang Vo Cong

Tohoku Journal of Natural Disaster Science　52　67-72　2016/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Examination of wave prediction accuracy in the sea of Japan for winter season

Tsuyoshi Kotoura, Hitoshi Tanaka

Tohoku Journal of Natural Disaster Science　52　115-120　2016/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
津波によりもたらされた河口周辺凹状浸食地形の回復過程に関する理論的研究

Hoang Vo Cong, 田中仁, 三戸部佑太

津波工学研究報告　32　53-60　2015/09/30
Publisher: 東北大学
ISSN： 0916-7099
Study of the morphological development around river mouth in Lake Tuni, Bolivia

51　225-230　2015/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Influence of water environment on growth of Corbicula japonica in Lake Jusan

51　231-236　2015/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Analysis on morphological recovery of tsunami-induced concave shoreline

51　93-98　2015/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Change in Longshore Sediment Transport behind Detached Breakwaters due to Tsunami

51　115-120　2015/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Analysis of the geomorphic change and the structural damage due to Tsunami

51　121-126　2015/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
離岸堤周辺における津波発生前後の漂砂環境変化

森文章, 三戸部佑太, 田中仁

土木学会論文集B3（海洋開発）　71　(2)　2015

DOI： 10.2208/jscejoe.71.I_647 　
Numerical analysis of tsunami wave intrusion into a river

50　145-150　2014/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Analysis of the geomorphic change around the revetment due to the Tohoku-Pacific Ocean Earthquake and Tsunami

50　151-156　2014/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Changes in morphology on Sendai Coast and its problems after the 2011 tsunami

50　163-168　2014/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Imaging technique for measuring 3D distribution of suspended sediment concentration with color pattern illumination

50　205-210　2014/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Aquatic environment of Porong River downstream of inflow from mud volcano

50　241-244　2014/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Morphological Change of Gamo Lagoon due to the 2011 Tsunami and Its Recovery

50　175-180　2014/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
The 2013 flood disaster in Yamagata and Fukushima Prefectures (flash report)

Hitoshi Tanaka

JSCE Magazine　98　(12)　4-5　2013/12
Publisher: JSCE
ISSN： 0021-468X
Follow-up report on the 2011 Tsunami disaster in Japan

Hitoshi Tanaka

Hydrolink, International Association for Hydro-Environment Engineering and Research (IAHR)　(1)　30　2013/09
Publisher: International Association for Hydro-Environment Engineering and Research (IAHR)
Analysis of the effect of external force to the revetment due to the Tohoku-Pacific Ocean Earthquake and Tsunami

49　219-224　2013/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Characteristic of exchange of salt and fresh water in Iwaki River mouth

49　139-144　2013/03
Publisher: 東北大学災害科学国際研究所東北地区自然災害資料センター
Recent flood disasters in Niigata and Fukushima Prefectures

Hitoshi Tanaka

Electric Power Civil Engineering　359　(5)　3-7　2012/05
Publisher: 電力土木技術協会
ISSN： 0386-2895
New research institute for disaster prevension and engineering education -one year after the 2011 earthquake disaster-

Hitoshi Tanaka

Journal of Japanese Society for Engineering Education　60　(3)　2-2　2012/05
MORPHOLOGICAL CHANGE AFTER THE TSUNAMI AROUND NATORI RIVER MOUTH

48　109-114　2012/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Sediment deposit in a lake : comparative study between Lake Tuni, Bolivia and Inawashiro Lake, Japan

48　237-242　2012/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
SHORELINE CHANGE MODELING COMBINED WITH THE RIVER MOUTH MODEL

48　137-142　2012/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Estimation of geomorphic and environmental change in Jusan Lake

48　207-212　2012/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Sceintific assistance for water resources management in Bolivia considering glacier retreat due to climate change

Hitoshi Tanaka

SUIRAN　26　29-32　2012/03
Publisher: Aoba Foundation for Engineering Promotion
Rivers in Tohoku District affected by the 2011 Tsunami

Hitoshi Tanaka

KASEN REVIEW　154　(Winter Issue)　20-26　2012/03
Estimation of Celerity and Velocity for Tsunami Propagation into Riversby Computational Fluid Dynamics

M. Roh, H. Tanaka, M. B. Adityawan, A. Mano, K. Udo

Coastal Engineering 2012　in press　2012

DOI： 10.9753/icce.v33.currents.12 　
Report of "Japan-Indonesia Workshop on Estuary and Climate Change"

Tanaka Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　46　1-8　2011/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Sand spit decline at the Sagami River mouth

Tohoku journal of natural disaster science　47　207-212　2011/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Stability of detached breakwater against tsunami

Tohoku journal of natural disaster science　47　101-106　2011/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Investigation of floc transport from Nagase river mouth

Tohoku journal of natural disaster science　47　225-230　2011/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Study in aquatic environment of Lake Jusan in investigating LCA

Tohoku journal of natural disaster science　47　219-224　2011/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Evaluation of academic achievement using a portfolio

Hitoshi Tanaka

MANABI NO MORI　(Autumn Issue)　2010/10
4-324 Use of Portfolio for Engineering Education : Study guidance using a record of academic achievement

TANAKA Hitoshi

22　534-535　2010/08/19
Publisher: Japanese Society for Engineering Education
Frontier of research: "Glacier retreat in in the Andes Mountains"

Hitoshi Tanaka

AOBA MOYU　12　(Spring)　2010/05
3rd international conference on estuaries & coasts

Tanaka Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　45　1-8　2010/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Glacier retreat and resulting water resource problems in Bolivia

Tohoku journal of natural disaster science　46　161-166　2010/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Analysis of bathymetry change around groyne system on Ishinomaki Coast

Tohoku journal of natural disaster science　46　125-130　2010/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Investigation of shoreline change trends around the Nanakita River mouth using aerial photograph

Tohoku journal of natural disaster science　46　197-202　2010/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Bottom boundary layer beneath solitary wave motion

Journal of coastal engineering, JSCE　56　71-75　2009/10
Publisher: 土木学会
ISSN： 0916-7897
Water level rise in river entrance

Tanaka Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　44　21-24　2009/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Characteristics salt-water movement of Lake Jusan in 2008

Tohoku journal of natural disaster science　45　147-150　2009/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Calculation of salt-water movement of Lake Jusan

Tohoku journal of natural disaster science　45　141-146　2009/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Characteristics of salt-water movement at the mouth of Lake Jusan

Tohoku journal of natural disaster science　45　135-140　2009/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
2D vertical numerical simulation of sinusoidal wave using k-ω model

Tohoku journal of natural disaster science　45　157-162　2009/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Evaluation of the lake water mixture process caused by the internal seiche in Lake Inawashiro

Tohoku journal of natural disaster science　45　151-156　2009/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Estimation of long term shoreline change near the new mouth of the Omono based on old maps and field survey

Tohoku journal of natural disaster science　44　187-190　2008/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Experimental study on a smooth bed boundary layer flows under solitary wave

Tohoku journal of natural disaster science　44　197-202　2008/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Spatial variation of water quality around Yo Island in Songkhla Lake, Thailand

Tohoku journal of natural disaster science　44　191-196　2008/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Numerical Simulation of Shoreline Change on Sendai Coast

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　42　7-12　2007/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field observation of infiltration flow in a sand spit at the mouth of Nanakita River

Tohoku journal of natural disaster science　43　235-240　2007/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Turbulence models for rough turbulent boundary layers under asymmetric waves

Tohoku journal of natural disaster science　43　247-252　2007/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Shoreline Change and Sediment Budget Analysis on Sendai Coast

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　41　9-12　2006/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Modelling Hydrodynamics and Salinewater Transport in the Lower Mekong River, Vietnam

Tohoku journal of natural disaster science　42　1-6　2006/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
伊能大図に基づいた海岸線変化動向の評価--米代川河口周辺海岸

松冨英夫, 田中仁, 泉典洋

東北地域災害科学研究　42　51-53　2006/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
猪苗代湖の北部湖岸における湖浜変形と植生の調査

藤田豊, 田中仁, 根本教弘

東北地域災害科学研究　42　167-172　2006/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
河川流量・波浪に呼応した名取川河口水深の周年変動に関する検討

渡辺一也, 田中仁

東北地域災害科学研究　41　99-104　2005/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
海岸線変化推定への伊能大図の利用可能性--秋田県船川での経度方向の精度検討例

松冨英夫, 田中仁, 泉典洋

東北地域災害科学研究　41　65-68　2005/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
宮城県沿岸域を描いた古地図の精度に関する検討

田中仁, 松冨英夫, 泉典洋

東北地域災害科学研究　41　13-18　2005/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
猪苗代湖の北部水域の濁度観測

藤田豊, 長岐高史, 田中仁

東北地域災害科学研究　41　159-164　2005/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
INCEPTIVE TOPOGRAPHY OF FLUVIAL-DOMINATED RIVER MOUTH TERRACES AND THE RIVER SEDIMENT SUPPLY

泉典洋, 田中仁, 伊達政直, 坪井宏介

全日本広域土砂収支評価平成14-16年度 No.14350262　2005
Field Observation of Short-term Morpholigy at the Nanakita River mouth

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　39　25-28　2004/04/01
Publisher: Tohoku University
ISSN： 0288-9994
閖上漁港の防波堤延伸に伴う港内汀線の変化

田中仁, Pornpinatepong S., 渡辺一也

東北地域災害科学研究　40　247-252　2004/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
古地図に見られる名取川河口と野蒜海岸の特徴

田中仁, 松冨英夫, 泉典洋

東北地域災害科学研究　40　185-190　2004/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
猪苗代湖の北部水域における流動現象の観測

藤田豊, 田中仁, 長岐高史

東北地域災害科学研究　40　163-168　2004/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
石巻湾における海浜変形資料の解析

高橋徹, 田中仁

東北地域災害科学研究　40　241-246　2004/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
A213 On the Transport of Fine Suspended Solids in Rivers

PILAILAR Sitang, IZUMI Norihiro, TANAKA Hitoshi

2004　234-235　2004
Publisher: 日本流体力学会

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In most of the existing models of suspended sediment transport, the fine sediment is assumed to be abundant on the bed. This is not the case in most of actual rivers. Once most of fine sediment on the bed is removed from the bed, the entrainment rate is reduced due to the lack of fine sediment on the bed. This study proposes a new transport model of fine suspended solids in rivers. The model takes into account of the variation of the amount of fine particles on the bed by introducing an availability function and the continuity equation of fine particles on the bed. The model is applied to SS data obtained in a field observation during a small flood. It is found that the proposed model describes the behavior of the SS concentration considerably well compared with an existing model.
A215 Linear stability analysis of the formation of beach cusps

IZUMI Norihiro, TANIKAWA Asako, TANAKA Hitoshi

2004　238-239　2004
Publisher: 日本流体力学会

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Beach cusps are uniformly spaced, arcuate scallops formed at beaches. They are inseparably connected with nearshore current. The nearshore current system forms a vriety of circulation patterns, which have been attracting many researchers' interest since long time ago. While several theories have been proposed on formation nearshore current systems, Hino attributed their formation to the dynamic instability, and explained it in terms of liner stability analysis. In this study, his theory is revisited and improved in several aspects.
Field Observation of Water Level and Morphology at the Mouth of Nanakita River

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　38　13-22　2003/04/01
Publisher: Tohoku University
ISSN： 0288-9994
洪水後における名取川河口砂州の変形過程

渡辺一也, 田中仁

東北地域災害科学研究　39　111-117　2003/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Turbulence Structure of Boundary Layer Under Non-Linear Wave Motion

Tohoku journal of natural disaster science　39　177-182　2003/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Analysis of Nanakita River Mouth Morphology by Using Aerial Photograph

Tohoku journal of natural disaster science　39　123-128　2003/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
光電式砂面計による浮遊砂濃度分布測定の試み

菅原亮治, 田中仁, 山路弘人

東北地域災害科学研究　39　183-188　2003/03
Publisher: 東北大学大学院工学研究科東北地区自然災害資料センター
Fluctuation Characterristics of Water Level at the Nanakita River Mouth

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　37　32-36　2002/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field Observation of Water Temperature in Lake Inawashiro and Its Visualization

FUJITA Yutaka, TANAKA Hitoshi, TOTSUKA Yasunori, YAMAJI Hiroto, AIKAWA Kaoru, SAWAMOTO Masaki

2002　(8)　399-400　2002/03/14
Publisher: The Japan Society of Mechanical Engineers

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Lake Inawashiro, located in Fukushima Prefecture, is a typical deep acid lake in Japan. The water from Nagase River, which pours to the lake from the north, is the cause of acid water quality in this lake. Deep lakes have a possibility of occurrence of internal seiche, which is very important in terms not only of hydrodynamics but also of water quality variation. A field observation was carried out in Lake Inawashiro in autumn in 1999,when the thermal structure was overturned. From the result of the present water temperature observation, internal seiche was detected successfully along the line from the south to the north.
猪苗代湖の北部水域における水質観測

藤田豊, 田中仁, 和泉陽

東北地域災害科学研究　38　111-116　2002/03
Publisher: 日本自然災害学会東北支部
名取川河口改修前後の河口砂州地形の変化

渡辺一也, 田中仁

東北地域災害科学研究　38　197-202　2002/03
Publisher: 日本自然災害学会東北支部
バングラデッシュにおける海岸浸食の機構と海面上昇がもたらすその加速化の軽減法に関する研究

田中仁, 泉典洋, Samad Mustafa Ataus

研究報告書　25　53-56　2002
Publisher: 日産科学振興財団
ISSN： 0911-4572
Annual Variation of Hydraulic Characteristics and Benthos Distribution Caused by Dredging in Tidal Compartment at River Mouth

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　36　64-71　2001/04/01
Publisher: Tohoku University
ISSN： 0288-9994
猪苗代湖長瀬川河口における湖浜変形調査

藤田豊, 田中仁, 萩原真二

東北地域災害科学研究　37　87-92　2001/03
Publisher: 日本自然災害学会東北支部
猪苗代湖の長瀬川河口水域における流動と水質観測

藤田豊, 田中仁, 芦澤祐一郎

東北地域災害科学研究　37　99-104　2001/03
Publisher: 日本自然災害学会東北支部
ポケットビーチにおける河口の位置について

泉典洋, 首藤伸夫, 田中仁

応用力学論文集　4　581-590　2001
Publisher: 土木学会
ISSN： 1345-9139
Field observation on the sea water intrusion into the Abukuma River

MANO Akira, SAWAMOTO Masaki, TANAKA Hitoshi, KONNO Osamu

Annual report of the Society for the Promotion of Construction Engineering　35　11-16　2000/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Nimerical Simulation of Topography change at the Nanakita River Mouth

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　34　47-50　1999/04/01
Publisher: Tohoku University
ISSN： 0288-9994
平成10年8月洪水による阿武隈川高水敷での土砂堆積現象

松田幸子, 泉典洋, 田中仁

土木学会東北支部技術研究発表会講演概要　1998　1999
Mudflow sedimentation phenomenon to flood channel observed in Abukuma River flood, in August, 1998. (Ministry of Education S).

泉典洋, 田中仁, 松田幸子

1998年南東北・北関東の集中豪雨災害に関する調査研究平成10年度 No.10400011　1999
Flood plain sedimentation in the Abukuma River Flood of August, 1998.

松田幸子, 泉典洋, 田中仁

東北地域災害科学研究　35(1998)　1999
Topography Change at the Nanakita River Mouth after Excavation

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　33　46-49　1998/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Study on assessment of bottom topography change due to tsunamis

SHUTO Nobuo, TANAKA Hitoshi, IMAMURA Fumihiko, TAKAHASHI Tomoyuki

Annual report of the Society for the Promotion of Construction Engineering　33　54-59　1998/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Sedimentation shape of the estuary where river flow is predominant.

伊達政直, 泉典洋, 田中仁

土木学会東北支部技術研究発表会講演概要　1997　1998
Sedimentation and transportation of floating sand by river mouth jet.

坪井宏介, 泉典洋, 田中仁

土木学会東北支部技術研究発表会講演概要　1997　1998
An Estimation Method of Gorge Section at the Nanakita River Mouth

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　32　60-64　1997/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Landform fluctuation process with runoff of bedload in river mouth.

伊達政直, 泉典洋, 田中仁

土木学会東北支部技術研究発表会講演概要　1996　1997
Complete Closure of the Nanakita River Mouth in 1994

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　31　33-41　1996/04/01
Publisher: Tohoku University
ISSN： 0288-9994
field Survey of Topography Change at the Nanakita River Mouth

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　30　67-72　1995/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field Survey of Water Quality and Exchange in SHizugawa Bay

SHUTO Nobuo, SUDO Ryuichi, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　30　73-80　1995/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Topography Change at the Nanakita River Mouth in 1992

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　29　96-100　1994/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field Survey of Water Quality and Water Exchange in Shizugawa Bay

SHUTO Nobuo, SUDO Ryuichi, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　27　103-105　1992/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field Survey and Analysis of the Blocking of the Nanakita River Mouth

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　27　98-102　1992/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field Measurement and Analysis of Topography Change at the Nanakita River mouth

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　26　42-48　1991/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Field Measurement of Topography and Hydraulic Characteristics at the Nanakita River mouth

SHUTO Nobuo, TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　25　64-69　1990/04/01
Publisher: Tohoku University
ISSN： 0288-9994
Sand Movement Under Wave-Current Interacted Motion

TANAKA Hitoshi

Annual report of the Society for the Promotion of Construction Engineering　21　118-119　1986/03/31
Publisher: Tohoku University
ISSN： 0288-9994

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Books and Other Publications 26

Solved Problems Using Hydraulic Formulas

Hitoshi Tanaka et al.

Japan Society of Civil Engineers　2024/12

ISBN: 9784810610918
Climate Change and Flood Disasters

Hitoshi Tanaka

Tohoku University Press　2024/02
Teizan Canal -History and its effectiveness for tsunami energy reduction-, In Water projects and technologies in Asia : historical perspectives

Hitoshi Tanaka, Nguyen Xuan Tinh, Kiyoshi Hashimoto

CRC Press　2023/04

ISBN: 9781032120386
Civil Engineering Heritage Award in Japan, In Water projects and technologies in Asia : historical perspectives

Hitoshi Tanaka, Nobuyuki Tamai

CRC Press　2023/04

ISBN: 9781032120386
Water projects and technologies in Asia : historical perspectives

Woo, Hyoseop, Tanaka, Hitoshi, De Costa, Gregory, Lu, Juan

CRC Press　2023/04

ISBN: 9781032120386
Glossary of Coastal Engineering

Nguyen Trung Viet, Nguyen Xuan Tinh, Hitoshi Tanaka

Nhà Xuất Bản Xây Dựng　2021/11

ISBN: 9786048257309
Numerical models for predicting shoreline evolution: Theory and Application

Nguyen Trung Viet, Nguyen Xuan Tinh, Nguyen Trong Hiep, Dang Van To, Hitoshi Tanaka

Science and Technics Publishing House　2020/08
Abstract Book of The 8th International Conference on Fluid Mechanics 2018

TANAKA Hitoshi, Hua Liu, Nguyen Xuan Tinh

2018/09
The 2011 Japan Earthquake and Tsunami: Reconstruction and Restoration

TANAKA Hitoshi

2018/02

ISBN: 9783319586908
Tsunamis and Earthquakes in Coastal Environments -Significance and Restoration

Vicente Santiago-Fandino, Hitoshi Tanaka, M. Spiske

Springer　2016

ISBN: 9783319285283
Report on the Great East Japan Earthquake Disaster, Fundamental Aspects 2

Hitoshi Tanaka

Japan Society of Civil Engineers　2014/06/15
Joint Survey Report on the 2011 Great East Japan Earthquake Disaster

Hitoshi Tanaka

Japan Society of Civil Engineers　2013/06
Anlyzing the 2011 East Japan Eathquake Didaster

Hitoshi Tanaka

Akashi Publishing Company Ltd.　2013/06

ISBN: 9784750338231
Coasts in Japan

Hitoshi Tanaka

Asakura Publishing Co., Ltd.　2013/05/25

ISBN: 9784254160659
Encyclopedia of Rivers

Hitoshi Tanaka

Maruzen　2013/05
Preliminary Reconnaissance Report of the 2011 Tohoku-Chiho Taiheiyo-Oki Earthquake

Hitoshi Tanaka

Maruzen Publishing Co., Ltd.　2011/07/30

ISBN: 9784818920347
Introduction to Hydraulics

Akira Mano, Hitoshi Tanaka, So Kazama, Makoto Umeda

Kyoritsu Publishing Company　2010/12/10

ISBN: 9784320074309
Estuaries in Japan

Hitoshi Tanaka

Kokon Publishing Col., Ltd.　2010/03/20

ISBN: 9784772261074
Coastal Engineering Manual (Japanese Translation)

Hitoshi Tanaka

AQUATEC Co., Ltd.　2008/11
Civil Engineering -Sensitivity requred for nation-building-

Hitoshi Tanaka

Gihodo Publishing Co., Ltd.　2007/03/25
Encyclopedia of Measurement and Analysis on Global Environment

Hitoshi Tanaka

2003/03
Encyclopedia of Disaster Prevension

Hitoshi Tanaka

Tsukiji Publishing Company　2002/07
FORTRAN programs based on hydraulic formulae

Hitoshi Tanaka

2002/03
Coastal Engineering Thesaurus

Hitoshi Tanaka

Japan Society of Civil Engineers　2000
Hydraulic Formulas

Hitoshi Tanaka

Japan Society of Civil Engineers　1999/11

ISBN: 481060201X
Towards the creation of sedimentary evironment

Hitoshi Tanaka

1998

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Presentations 47

Bottom boundary layer beneath long waves International-presentation

The 2nd International Conference on Coastal Zones and Engineering　2010/11/01
学習等達成度記録簿による教育効果の測定の取り組みについて

私立大学連盟平成2 2 年度教学担当理事者会議　2010/09/02
工学教育におけるポートフォリオの活用

平成22年度工学・工業教育研究講演会　2010/08/20
Coastal Erosion -Problems and Solutions- International-presentation

Special Lecture, Institut Teknologi Sepuluh Nopember　2010/08/11
Estuarine Hydro-& Morpho-dynamics and Global Climate Change International-presentation

Japan-Indonesia Workshop on Estuary and Climate Change, Indonesia　2010/08/08
河口の水理現象と地球温暖化

社団法人全国海岸協会第４１回定期総会　2010/06/01
ポートフォリオを用いた修学指導

東北大学高等教育講演会「学士課程教育の体系化をどう進めるか―学修の系統化と大学院への接続―」　2010/01/25
学習等達成度記録簿による教育効果の測定

平成２１年度大学教育改革プログラム合同フォーラム　2010/01/08
気候変動が河口の水理・土砂移動に及ぼす影響について

(社)建設コンサルタンツ協会東北支部河川講習会　2009/12/11
Morphological response to port construction on Sendai Coast International-presentation

International Conference on Water Resources Engineering -50th Foundation Anniversary of Water Resources University-　2009/11/13
貞山堀のこれまでとこれから

仙台学長会議主催市民公開シンポジウム地域の歴史を学び、特に北上川と貞山堀の利用をめぐって地域の将来を展望する　2009/11/03
河口の水理・地形と気候変動

2009年度(第45回)水工学に関する夏期研修会講義集, Aコース　2009/08/05
東北地方の沿岸環境

日本大学大学院工学研究科土木工学専攻特別講義　2009/07/03
Turbulent boundary layers under saw-tooth waves International-presentation

四川大学国家重点実験室特別講演　2009/04/27
学習等達成度記録簿による教育効果の測定

平成２０年度大学教育改革プログラム合同フォーラム　2009/01/12
「教育方法の工夫改善を主とした取組の紹介，学習等達成度記録簿による教育効果の測定」

―２１世紀の大学教育を拓く―第３回みちのくGP交流シンポジウム　2008/12/08
近年の豪雨災害とその課題

名取川河川防災座談会（名取川河川改修促進期成同盟会，国土交通省仙台河川国道事務所，宮城県）　2008/11/29
Wave setup at river mouths in Japan International-presentation

Fifth Anniversary Workshop of the Marine and Coastal Engineering Faculty, Water Resources University, Hanoi, Vietnam　2008/11/18
特別講演「河口の水理と土砂移動」

Coastal Engineering Manual (CEM) 出版記念講演会　2008/11/10
ESTUARINE HYDRODYNAMICS AND MORPHODYNAMICS International-presentation

The 16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research (IAHR) and the 3rd IAHR International Symposium on Hydraulic Structures　2008/10/20
In-situ investigation and simulation of water quality changes in Songkhla Lake International-presentation

Nguyen, T.V, Takasaki, M, Yamaji, H, Pornpinatepong, S, Pornpinatepong, K

the 4th International Conference on Asian and Pacific Coasts (APAC2007)　2007/09/21
Empirical and numerical studies on beach profile change caused by overwash in Yokosuka Coast, Japan International-presentation

2nd Japan-Vietnam Estuary Workshop　2007/08/20
河口研究の動向と課題

港湾空港技術研究所特別講演会　2007/07/31
Monitoring and mathematical modeling of river mouth morphology change International-presentation

Indo-Japan Workshop on Coastal Problems and Mitigation Measures - Including the Effect of Tsunami　2007/07/16
Coastal Erosion; Problems and Solutions International-presentation

12th National Convention on Civil Engineering (NCCE)　2007/05/02
Hydro- and morpho-dynamics at river entrances International-presentation

51st Conference on Hydroscience and Hydraulic Engineering　2007/03/06
Monitoring and modeling of short-term morphology change at a river entrance International-presentation

2nd International Symposium on Estuary and Coast　2006/11/28
Numerical investigation on a rough bed turbulent boundary layer under cnoidal wave motion International-presentation

7th International Conference on Hydro-science and Engineering　2006/09/11
Monitoring of Short-term Morphology Change at a River Mouth International-presentation

Japan-Vietnam Estuary Workshop　2006/08
2004年インド洋津波によるスリランカでの河川災害

河川災害に関するシンポジウム　2006/03/08
広瀬川の中州の発達過程とその影響

広瀬川管理フォーラム　2005/11/13
スマトラ沖地震津波スリランカ国被害調査報告

河川整備基金助成事業成果発表会　2005/10/28
Estuaries - Their science and management International-presentation

Japan-Indonesia Estuary Workshop　2005/08/22
近年発生した内外豪雨災害に見られる特徴と課題

2005年度(第42回)土木学会・水工学に関する夏期研修会　2005/08/02
Turbulent boundary layers and sediment movement induced by sawtooth waves International-presentation

The International Conference on Environmental Fluid Mechanics (ICEFM'05)　2005/03/03
日本の河口の物理環境の変遷と研究史

沿岸環境関連学会連絡協議会第12回ジョイント・シンポジウム「内湾河口漁場の崩壊過程―その検証を予防と再生に活かす」　2005/02/12
Impact of port construction on coastal and river mouth morphology -A case study at Sendai Port- International-presentation

9th International Symposium on River Sedimentation　2004/10/19
論文集に見る水理学と海岸工学の動向

土木学会年次学術講演会研究討論会「水理学の使命と役割－２１世紀の水理学を考える－」　2004/09/08
Numerical modeling of oscillatory boundary layers using two-equation turbulence models International-presentation

6th International Conference on Hydro-science and Engineering　2004/05/31
Mathematical modeling of morphological change at a river mouth International-presentation

International Symposium on Estuary and Coast　2003/11/09
河口周辺域における地形変化と生態系への影響

流域・河口海岸系における物質輸送と環境・防災に関するシンポジウム　2003/08/11
沿岸海域での流れと物質輸送－沿岸海域の環境保全と防災－

海洋気象学会シンポジウム　2001/12/17
河口部の土砂移動

水工学に関する夏期研修会　2001/08/03
Relationship between Water Level Variation and Morphological Change at River Mouths International-presentation

Hydraulics Seminar to celebrate the 20th Anniversary of the Urban Affairs Research Institute　2001/04
Flood management -A case study in Japan- International-presentation

Annual Conference on Engineering: Advanced Technology in the next Decade　2000/11
波動運動下の乱流現象

第8回乱流フォーラム　1997/10/01
外浜砂浜域での漂砂底質特性

生態系工学第7回シンポジウム　1991/01/24

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Research Projects 29

Tidal Mixing and water quality in a bay Competitive

System: Funded Research

1988/04 - Present
oscillatory boundary layer Competitive

System: The Other Research Programs

1988/03 - Present
Sediment movement in rivers and the sea Competitive

System: Grant-in-Aid for Scientific Research

1988/03 - Present
令和元年台風19号及び台風21号による広域災害に関する総合研究

二瓶泰雄, 中北英一, 竹見哲也, 山田朋人, 三隅良平, 飯塚聡, 鈴木真一, 仲江川敏之, 柳瀬亘, 立川康人, 田中茂信, 佐山敬洋, 田中智大, 朝位孝二, 前野詩朗, 田中仁, 吉谷純一, 田中規夫, 泉典洋, 矢野真一郎, 森脇亮, 赤松良久, 内田龍彦, 重枝未玲, 岩崎理樹, 清水義彦, 小山毅, 長谷川兼一, 西嶋一欽, 藤本郷史, 毛利栄征, 前田健一, 岡村未対, 卜部厚志, 森口周二, 蝦名裕一, 松四雄騎, 王功輝, 竹林洋史, 鈴木素之, 田島芳満, 佐々木淳, 信岡尚道, 森信人, 有川太郎, 鈴木崇之, 下園武範, 松井正宏, 小林文明, 畑山満則, 牛山素行, 佐藤健, 梶谷義雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究促進費

Institution: 東京理科大学

2019/12/04 - 2023/03/31

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令和元年東日本台風（台風19号）とその2週間後の大雨（台風21号と低気圧）による広域災害の被害状況・メカニズムの全容を明らかにすることを目的とし，多角的・総合的に多くの分野の専門家からなる研究グループを結成し，調査研究を継続して行った．ここでは，①台風・低気圧による豪雨・流出現象の気象学的解明，②広域にわたる洪水氾濫災害を引き起こしたメカニズムの解明，③多発した土砂災害・土構造物破壊におけるメカニズムの解明，④強風や高潮による被害実態の解明，⑤住民の避難行動の実態と防災情報の伝達状況の把握，の5つのテーマと主に対象とした．その結果，台風19号による豪雨に，山岳部は勿論，平野部でもseeder-feeder機構が貢献していることを，XRAINによる立体観測情報，ひまわりによる観測情報により，seeder-feeder機構を表現した数値モデルを用いて示した．2019年台風19号による豪雨発生機構について，気象庁メソ客観解析データを用いて，降水活動に係る大気安定度や水蒸気場の解析をし，本豪雨発生時には，最近の他の豪雨事例と比較して，湿潤絶対不安定が持続して形成されていたことが分かった．また，洪水氾濫による建築被害に関しては，長野市内の水害被害住宅を対象に，復旧後の室内環境に着目して現地調査を実施している．復旧には数ヶ月の期間を要するが，復旧手順は現地の判断で実施している場合が多く，客観的な情報が整備されていない．その一助となるべく，限られた事例ではあるが，復旧手順とともにそれに伴う環境改善効果を評価しながら知見を蓄積し，環境改善を測るために室内の浮遊真菌濃度や部位の含水率等を計測した．さらに，風水害に関しては，台風に伴って発生した竜巻の影響が大きかったため，台風と竜巻発生の関係を過去の気象資料から抽出し整理した．
Evaluation of hydrograph for tsunami waves propagating rivers

Tanaka Hitoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2016/04/01 - 2020/03/31

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In order to investigate “Tsunami Hydrograph”, characteristics of tsunami propagating into rivers were discussed through analysis of observed tsunami profiles and numerical simulation. Tsunami form of the 2011 Great East Japan Earthquake Tsunami along Kitakami River was compared with tsunami profiles observed along the coast and also on the ocean. River run up of the 2011 tsunami along Kitakami River was simulated with Shallow Water Equation model for more understanding on the characteristics of the observed tsunami form along the river. In addition, in order increase an accuracy of “Tsunami Hydrograph” computation, tsunami-induced bottom shear stress is investigated using a turbulence model. It is found that the behavior of tsunami-induced boundary layer is highly similar to wave boundary layer, rather than steady flow. Hence it is concluded that the conventional method based on steady friction law underestimate bottom shear stress.
Modification of littoral system due to combined tsunami and floods and its subsequent recovery

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

Category: Grant-in-Aid for JSPS Fellows

Institution: Tohoku University

2017/07/26 - 2019/03/31
土砂移動を伴う河川遡上津波に関する研究

田中仁, ROH MIN, ROH Min

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東北大学

2013/04/01 - 2016/03/31

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本年度の一年間で研究に大きな進展があった．実施した研究内容は，(1)文献調査，(2)モデル開発，(3)現地調査，(4)室内実験，(5)学会発表の５つの項目からなっている．それぞれの項目についての進捗状況を以下に記す．（１）文献調査：津波による土砂移動現象，ドライな砂面上を流れる流体運動および砂移動現象に関する文献調査を実施している．特に，津波特有の高シールズ数のもとでも近年の最新研究に関する情報を収集したことは有益な成果である．これより，予定通りに文献収集が行われていると判断する．（２）モデル開発：波動モデルとしては浅水流方程式およびｋ－ωモデルを組み合わせた方程式を用いている．また，漂砂量式については，（１）で実施した文献調査において代表的なものを抽出しており，その中から複数のものを使用している．また，検証のための実験データとして，後述のように国土交通省国土技術政策総合研究所における水理実験結果も使用できることとなった．（３）現地調査：研究対象としては，これまでも研究がなされている名取川および鳴瀬川とした．また，同河川における水位データ，空中写真を入手し，津波による地形変化，およびその後の回復過程に関する検討を行った．（４）室内実験：東北大学が有する段波水路において水理実験を行い，水位・流速・地形変化のデータを整備した．また，別途，国土交通省国土技術政策総合研究所における大規模な水理実験のデータを使用することが可能となり，より総合的なモデルの検証が可能となった．（５）学会発表：以上の研究結果を，土木学会などが開催する学術研究会において発表した．さらに，国際的なジャーナルである”Pure and Applied Geophysics“に論文が掲載されたことも特筆すべき成果である．以上のように，当初予定した以上に研究は進捗している．
Environmental changes and its improvement along the Porong River due to discharging sediment from a mud volcano

TANAKA Hitoshi, MANO Akira, UDO Keiko, UMEDA Makoto, KURE Shuichi, MITOBE Yuta

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2012/04/01 - 2015/03/31

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On May 29, 2006, mud and gases began erupting unexpectedly from a hydrocarbon exploration well near Sidoarjo, East Java, Indonesia. The mud is being pumped into the Porong River, which then carries the mud to the ocean approximately 20 km to the east. The main objective of this study is to assess (1) the effect of mudflow on the river and estuary environment such as sediment deposition and water quality using the observed river cross sections and bathymetry data, (2) application of numerical models to the Poring River, and (3) propose most suitable countermeasure which causes minimum environmental impact.
2011年東日本大震災津波による土砂移動現象に対する境界層モデルの適用

田中仁, MOHAMMAD BagusAdityawan

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東北大学

2011 - 2013

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2011年3月11日に発生した東日本大震災津波は東北地方を中心として甚大な人的・物的被害をもたらした他に, 大規模な海浜地形変化の変化ももたらしている. 本研究では, 津波の流動モデルを用い, 東日本大震災津波による土砂移動の再現を通じて, モデルの検証, および必要に応じてモデルの改善を行うことを目的としている. 今年度は研究の最終年度であり, これまでの研究の進捗を踏まえて予定通りに研究を終えた. まず, 昨年度の研究活動で選定したサイトとして宮城県東松島市における石巻海岸を研究対象とした. この海域を対象にして, 一昨年開発した数値モデルを適用し, 仮想的に海岸堤防の高さを4段階(0m, 1m, 3m, 5m)に変化させ, 津波の遡上に伴う流速値, せん断力, シールズ数などを数値シミュレーションにより求めた. モデルは水表面の計算にVOF法を使用し, 乱流モデルとしてk-εモデルを連立させることにより, 境界層の特性を数値計算に取り込んでいる. 数値計算により, 海岸堤防高さの増加に従って, 海域でのよどみ領域が拡がり, 海域における侵食が低減することが分かった. このように, 海岸堤防が堤内地での氾濫の低減のみならず, 海域における侵食をも低減できることは新たな構造物の価値としてきわめて興味深い知見である. これらの成果を, 第35回国際水理学会(平成25年9月, 中国・成都), 第12回河川土砂移動シンポジウム(平成25年9月, 京都)などにおいて発表を行った.
Development of Quasi 3D sediment transport model in wave breaker and swash zone and proposal of effective sediment transport control

MANO Akira, TANAKA Hitoshi, UDO Keiko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

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Vertical profile of eddy viscosity is modeled in wave breaking and swash zones. It enabled to get vertical profile of suspended sediment. Quasi-3D sediment transport model coupled with the higher order Boussinesq model was developed. Bypass sediment flux around headlands was observed at the Yamamoto coast, the prediction model of which was developed. It is shown the bypass flux is effectively controlled by adjusting the length of the head.
Estuarine environmental and morphological changes due to global warming and adaptation method against it

TANAKA Hitoshi, MANO Akira, KAZAMA So, UMEDA Makoto, SASAKI Mikio, NAGABAYASHI Hisao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2009 - 2012

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There have a numerous number of investigations regarding possible environmental changes induced by future global climate change. However, very few researches have been made for estuarine environmental changes in future. Hence the present study focuses on (1) shoreline change around a river mouth, (2) equilibrium cross-sectional area at a river entrance, (3) salinity intrusion into a river and (4) salinity intrusion into ground water near a river mouth.
高波浪時のバリアー地形の変化に関する研究

田中仁, NGUYEN XuanTinh, NGUYEN Xuan Tinh, NAUYEN XuanTinh

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東北大学

2009 - 2011

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これまで,海浜変形に関する研究は枚挙に暇がないほど数多くのものがなされている.ただし,これらの既往の研究は,沖浜帯から砕波帯,遡上域までを対象とする研究がほとんどである.海浜において大規模な地形変動をもたらす高波浪時には,このような沖域から遡上域までの海浜部のみならず,波が遡上し,さらには越波が生じる海浜域においても大きな地形変動が生じる.しかし,このような間欠的に生じる越波現象に伴う地形変化については,これまでほとんど研究がなされていない.その理由は,(1)現象の生起がまれであり,またその発生箇所も予測が困難であるため,現地データがほとんど蓄積されていない,(2)間欠的に生じる越波による,ドライな砂面上の薄層流を記述する動力学が確立されていないことなどが挙げられる. そこで,今年度の研究においては,このような越波に伴う地形変化に対する対策工の効果に関する検討を行った.対象は宮城県仙台市に位置する七北田川河口の蒲生干潟であり,同所には砂丘頂部に越波防止を目的とした捨て石堤が建設されている箇所と,未整備の箇所がある.そこで,これまでに開発したモデルを両者に適用することにより,3mの越波防止堤の存在が土砂移動を効果的に防止していることが分かった.一方,越波防止堤が整備されていない箇所については,越流により大規模な土砂堆積が生じることが分かった. また,蒲生干潟海岸では津波の越流により砂浜地形が大きく変化した.そこで,2011年3月以降には津波による地形変動についても現地調査を行い,バリアー地形の回復過程を明らかにした.
Development of the morphological equilibrium conditions for the river mouth management

MANO Akira, TANAKA Hitoshi, SASAKI Mikio, IFUKU Makoto, MINAMI Masato

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2005 - 2008
Study on optimum aquaculture production in Songkhla Lake considering tidal inlet morphology and water quality change

TANAKA Hitoshi, YAMAJI Hiroto, TAKASAKI Mitsuru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2005 - 2007

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Songkhla Lake, located in the southern part of Thailand, connects to the Gulf of Thailand through a narrow channel, and is consists of three lakes: Thale Noi, Thale Luang and Thale Sap Songkhla. In the southernmost lake, Thale Sap Songkhla, aquaculture of seabass is now an important industry in this area. In the recent years, however, sudden death of fishes occurs frequently due to over-production in the lake. In the present study, filed investigation and numerical simulation are carried out to clarify the mechanism of water quality change in Songkhla Lake. In the field observation, automated water quality measuring devices are installed in an aquaculture area to obtain time-variation of current velocity, DO (dissolved oxygen), salinity and temperature in October 22005, 2006 and 2007. Furthermore, numerical simulation is applied to evaluate flow field in the lake. For this purpose, a depth averaged hydrodynamic model in a curvi-linear boundary fitted coordinate system is applied to achieve sufficiently high accuracy for a complicated. Topography in the lake. It is concluded that increase in DO concentration is mainly due to tidal current coming into the lake, while the reduction DO is attributed to respiration of fishes. In addition, simulation of DO concentration was conducted by using an ANN model. It can be recognized that the model results are in a good agreement with the measurement data, which indicates that the model is able to predict the DO concentration in the Songkhla Lake with a reasonable accuracy.
古地図に描かれた河川・海岸地形の精度評価とその活用法に関する研究

田中仁, 泉典洋, 松冨英夫

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 萌芽研究

Institution: 東北大学

2003 - 2005

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海岸地形や河川地形の変遷に関する検討を行うためには,これまで国土地理院や各種行政機関により発行された各種地形図や空中写真などが用いられてきた.しかし,これらによりさかのぼることの出来る時間スケールは数10年オーダー,長くても100年程度のものであった.そこで,本研究においては,伊能図に代表される古地図が有する地形情報に関する検討を実施した.伊能図に関してはこれまで人文地理の視点から注目を集めることが多かったが,海岸地形・河川地形の研究分野においても,200年以上も前の地形情報を与えるものとして貴重な存在であると期待される. まず,仙台海岸,石巻海岸および秋田海岸周辺の伊能図の解析行い,その地形情報の精度に関する検討を実施した.特に,阿武隈川や北上川といった比較的大規模な河川が流入している仙台海岸,石巻海岸を対象とした検討においては,国土地理院発行の地形図と併せることにより,平均的汀線前進速度を見積もることが出来た.土砂堆積速度に関しても,75,000m^3/年との数値を得ることが出来た.また,秋田海岸を対象とする解析においても,現在の汀線位置に比べて有意な差が認められた.さらに,熊本県・球磨川を対象に,伊能図と現在の地形図を比較することによって長期的な河道変動解析を試みた.その結果,河口周辺の地形変化は良好な精度で推定できることが示された.穿入蛇行区間では伊能図の河道位置はかなりの精度を持つものの,河道はほとんど変化していないことが判った.一方,河道変動が予想される盆地内部では正確な河道位置が判らず,定量的な河道変動の推定が困難であることがわかった.しかし伊能図は定性的には多くの情報を含んでおり,使い方を吟味さえすれば有用な情報源となり得ることが判明した.これにより,200年程度の古い地形情報を解析することの有効性が示された.
Sediment budget analysis for large areas in Japan

TANAKA Hitoshi, UCHIJIMA Kunihide, KUROKI Mikio, SASAKI Mikio, SAKAI Shigeki, MATSUTOMI Hideo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2002 - 2004

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Severe erosion has been observed in many coastal area in Japan, partly due to reduction of sediment supply from river basin, and partly due to interruption of sediment movement due to coastal structures. Sediment budget analysis has been carried out for large areas in Japan, by organizing a research group covering whole of the country from Hokkaido to the western part of Japan. Furthermore, the research area has been extended to foreign country. Since it is important to introduce whole of the research results, some of the primary results will be described. 1.Based on long-term shoreline survey data on Sendai Coat located in northeast of the main land in Japan, sediment budget analysis has been carried out successfully. Especially, longshore distribution of sediment transport rate has been well estimated by considering factors such as sediment loss into the offshore direction and interruption of longshore sediment movement caused by offshore breakwaters. Similar long-term accumulation of shoreline survey data is highly recommended foe precise sediment budget analysis. 2.Long-term bathymetric data on Ishinomaki Coast has been analyzed for evaluating effect of headlands construction along the coast. It is found that the coastal morphology reached its equilibrium in the very recent years, except the down drift end of the study area where the mouth of the Naruse River is located. Due to the reduction of the sediment supply to the mouth, severe erosion of the sand spit can be observed. 3.Similar problem of sand spit intrusion can be seen at several river mouths such as Sagami, Ohyodo and Watari Rivers. In order to clarify such a complicated processes, equilibrium condition for cross sectional area at a river entrance. According to the process-based modeling developed herein, it is shown that the equilibrium condition can be described by two dimensionless parameters indicating relative importance of river and coastal sedimentations. The model results are applied to river mouths in Japan, and its applicability has been confirmed. Similar modeling will be useful for estimating sedimentary environment at a river mouth under combined influence of waves, river discharge and tides.
Summarizing of river mouth processing method based on comparative study on river mouth in Japan

TANAKA Hitoshi, UCHIJIMA Kunihide, MANO Akira, SAWAMOTO Masaki, TOHMA Satoshi, KUROKI Mikio

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A).

Institution: Tohoku University

1998 - 2000

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There have been several countermeasures against river mouth blockage due to high waves, such as training jetties, gate, culvert and artificial dredging. The relative advantages and disadvantages of each method are summarized based on a numerous field observations at various river mouths in Japan. Among these, it is noted that an artificial dredging method has quite less influence to adjacent coastal and estuarine environments. But, the presence of sand spit at a river mouth interrupts effluent flood flow into the sea. An appropriate flushing of the sand spit can reduce flooding intensity in the adjoining areas. Initial sand spit elevation influences initiation and development of flushing through a complex interaction of effluent flood discharge, tidal level and sediment transport processes. To investigate this complicated process, a numerical computation method is developed. After verification, it is used to investigate the influence of initial sand spit level on the time-variation of river stage and corresponding development of bed topography under the actions of both tide and high flood flow. Furthermore, sedimentation process around a river mouth is studied in connection with sand budget in a river basin and beach processes.
津波による大規模土砂移動の解析と評価方法の開発

首藤伸夫, 今村文彦, 高橋智幸, 田中仁, 箕浦幸治

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(A)

Category: 基盤研究(A)

1996 - 1998

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土砂の移動量を浮遊砂と掃流砂に分けて求めて計算を一様勾配斜面において基礎検討を実施し,この中で使用されている重要なパラメータとして流体中(海水中)の最大土砂濃度(Cs)や巻き上げに関する鉛直拡散係数がある.鉛直拡散係数は浅井・高橋(1998)による実験結果を引用することもでき,また,応答解析の結果でも範囲(0.001〜0.2)では,海底の変化は小さいことがわかった.一方,最大土砂濃度(Cs)による堆積量の違いは大きいことが判明した.これは,海水中に存在し得る土砂濃度(Cs)が大きいほど浮遊砂量が増大し,一旦巻き上げられた土砂が流れにより移動し易くなり,特に陸上部への堆積に寄与することが判明した.このCs値は,土砂の沈降と土砂を浮遊させる能力(乱流)に大きく関係していると考えられ,これに関する研究があるが室内実験に留まっているために,本ケースのような実際の現場で,しかもシールズ数がかなり大きいと思われる状態に適用することはできない.次に実際に,固定床での入射波条件を用いて,入間での移動床計算を実施した.全体的に海域で侵食傾向,陸側で堆積傾向であることが分かった.これは,押し波で入射した津波が,湾口の狭いしかも両側が切り立った入間湾に入ると,急縮の効果により流速値を増加させ,そこでの巻き上げ量を大きくして,陸上に運んだものと思われる.入間湾の地形は,今回の大規模堆積の原因の1つである.一方,Cs値の変化により地形が大きく変化していることも事実である.ただし,陸上部での堆積状態はほぼ同じである.現地調査で得られた70万m^3付近の堆積量を再現できたのは,0.3の時であった.従って,この程度の最大土砂濃度を仮定すれば大規模土砂移動をある程度再現できることがわかった.
Analysis on sediment transport under wave action as particle-fluid interacting system

SAWAMOTO Masaki, GOTOH Hitoshi, IZUMI Norihiro, TANAKA Hitoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1996 - 1998

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Aiming an application to the sediment transport analysis in sheet flow regime, basic mechanism of sediment-fluid interaction were studied from various view points. Sawamoto carried out two kind of experiments. In the first, fluid force exerting on particles were measured in dense mixture flow and a diagram of drag coefficient was proposed. In the second, velocity distributions of partic1e flow in steep chute were observed and shear stress was formulated. Tanaka analysed turbulent structure and bed shear stress under random wave action. Applying a spectral analysis, significant progress was achieved. The results were compared with experiments and k-epsilon model and reliability was checked. Izumi investigated the interaction between flow and movable beds theoretically. Formulating the stability of bed erosion by linear theory, it was shown that space of gullies is controlled by fluid-bed stability. Gotoh studied the effect of granular characteristics of sediment from two view points. At first, a series of experiments on collision between movable bed and saltationg particle were carried out. The results were utilized in the simulation. Secondly, particle movements were simulated by Lagrangian method.
Comparative Study on Rivermouth Process in Japan

SAWAMOTO Masaki, KUROKI Mikio, SASAKI Mikio, TOHMA Satoshi, UCHIJIMA Kunihide, TANAKA Hitoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: TOHOKU UNIVERSITY

1995 - 1997

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River mouth process at following rivers are investigated by investigators : Morphology at the Shokotsu River by Uchijima, River mouth closure in Hokkaido by Kuroki, Morphology at the Mukawa River by Tohma, Stability at the Iwaki River, by Sasaki, Morphology at the Yoneshiro River by Sakai, Sand barrier at the Koyoshi River by Matsutomi, Morphology at the Abukuma River by Sawamoto & Mano, Morphology at the Nanakita River by Tanaka, Morphology at small rivers by Nagabayashi, Water quality at the Tone River mouth by Ishikawa, Modeling of river mouth morphology by Shibayama, Morphology at Abe and Ohi Rivers by Kosuge, Morphology at the Agano River by Hayakawa, Sedimentation at the Tetori River by Tsujimoto, Errosion of sand barrier by Egashira, Hydraulics at the Yodo River mouth by Inoue Morphology at the Sendai River by Hinokitani and so on.
中小河川における水位データを用いた河口断面形状推定法の確立

田中仁, 首藤伸夫

Offer Organization: 日本学術振興会

System: 科学研究費助成事業試験研究(B)

Category: 試験研究(B)

Institution: 東北大学

1995 - 1995

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本研究では,河口内水位の変動特性から河口最狭部断面特性を推定する手法の精度を検討するとともに,同手法の適用性を判定するための条件について検討を行った.まず,現地データを入手するために,北上川河口に位置する宮城県・長面浦において調査を行った.また,仙台市・七北田川河口においても現地調査を実施した.同河川については1988年から昨年度までの資料も使用することができた.さらに,福島県いわき市・鮫川における資料を入手し,以上の3地点に対して断面推定法を適用した.実際に同手法を用いる際の問題点は以下のようである.すなわち,(1)断面形の仮定の仕方,(2)水路長の取り方,(3)最狭部での断面積,径深を求める際に使う水位の選びかた,(4)wave set-up高さの与え方である.これら各項目についての検討の結果,(1)推定される面積は断面形状の選び方によらず,差はほとんどない,(2)水路長には実際の長さを取ればよいこと,(3)水路中間点水位により断面積等を求めればよいことなどが分かった.(4)の砕波による水位上昇量については,現時点ではもっとも不明な点が多いが,これを未知数として経験的に定めることも可能であることが示された.次に,河口内での水位低減率a_Bを用いることにより,この手法の適用の可否を判定するための条件を得ることができた.実測水位によれば,少なくともa_B<0.8であれば同手法を適用できる.一方,線形された線形理論に基づく評価ではa_B<0.95なる条件が得られる.後者の条件は実測水位が無い場合でも使用できる. 河口横断測量に比べて,河口内水位観測は容易にかつ安価に行うことができる.本研究で開発する手法によれば,水位データから最狭断面の情報を推定することが出来る.これにより,従来,データの収集がきわめて手薄であった中小河川の河口断面特性に関して,きわめて有益な情報を提供できることになる。
STUDY ON THE MECHANISM OF ALGEE PROLIFERATION IN RESERVOIR AND ITS CONTROL THROUGH CONTINUAL AUTOMATIC OBSERVATION

MANO Akira, ISHIKAWA Tadaharu, NOIKE Tatuya, SUDO Ryuiti, TANAKA Hitoshi, GOTO Koki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (B)

Category: Grant-in-Aid for General Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1993 - 1995

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Mano and Goto executed continual observation at the Nakahara reservoir and analyzed heat budget to specify the boundary condition at the surface and to find diffusion coefficient as a function of Richardson number. Then the precise characteristics of oxygen production and consumption are obtained in terms of light, temperature and nutrition salts. Tanaka made observation at the Shizugawa Bay to find the condition for rapid exchange of the bay water in the effects of west wind and tidal range. Sudo has found the mechanism of Cyanobacteria domination though the cultivating mixed species as controlling factors of N/P ratio and temperature. Noike researched the effects of pre dams on removal of suspended phosphorus through a pilot plant to confirm the effectiveness and studied liquation of phosphorus under the anaerobic situation to evaluated the flux which is the latent nutrition. Ishikawa observed at Shitigashuku Dam to analyze mad, SS and phosphorus at floods condition and to find relationship among them.
混合砂からなる海浜における沿岸方向の底質分級に関する研究

田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 東北大学

1990 - 1990
河口砂州自然開削の実測・実験と解析

首藤伸夫, 田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業一般研究(C)

Category: 一般研究(C)

Institution: 東北大学

1989 - 1990

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1.仙台市・七北田川において二度の砂州フラッシュを観測したが,水位はほぼ同様なパタ-ンを示した.すなわち,洪水ピ-クの到達以前に河口水位にピ-クが現れ,一定の水位を保った後,急激な水位低下がみられる.これは,砂州上での越流,砂州の崩壊に対応したものであると考えられる.平均的な砂州の高さから判断して,洪水時の砂州上には水深数十cm程度の越流が生じていると考えられる. 2.二次元砂州を越える流れを再現することを目的として,kーεモデルによる自由表面を持つ流れの数値計算法を開発した.レ-ザ-流速計による実験結果と比較したところ,水面形,流速分布,剪断応力分布とともに予測値と実測値の対応は良好であった. 3.運動量保存則を用い,平衡状態と非平衡状態の掃流砂量の関係を示す方程式を得た.また,実験をもとに圧力差・斜面勾配の効果を考慮した平衡流砂量式を定めた.これを先の砂移動方程式に代入することにより,非平衡状態の砂移動量を求めることが出来る.この非平衡掃流砂量の計算法と不等流の水面形計算法を組み合わせて,実験室内の二次元砂州の崩壊プロセスを精度よく再現することができた。 4.河口地形の3次元的変化を予測する手法を開発した.計算には有限差分法を用い,実験(固定床実験)および七北田川で観測された実際の洪水を対象にして計算を行った.実験結果と計算を比較したところ,水位の分布について非常に良好な結果を得た.現地を対象とした計算に関しては,水位・地形は現地観測結果と十分に一致するものではなかった.この原因としては,流砂量式に通常の平衡状態の式を用いたことが考えられる.今後,3.に述べた成果をもとに,この点を改良する必要がある.
波・流れ共存場における混合砂の移動に関する研究

田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 東北大学

1989 - 1989
混合砂海浜における粒径別漂砂量と底質の分級現象に関する研究

田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 東北大学

1988 - 1988
二次元海浜におけるアーマー・コートの形成に関する研究

田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 宇都宮大学

1987 - 1987
河口砂州の河道内侵入対策工法の評価に関する研究

須賀尭三, 福岡捷二, 灘岡和夫, 石川忠晴, 田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 自然災害特別研究

Institution: 宇都宮大学

1986 - 1986

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本研究では、河口導流堤による河口砂州の河道内への侵入を阻止するメカニズムを、現地資料および実験により明らかにし、導流堤の機能を明確にすることを試みた。ここでは、河口部の砂移動現象を2つのプロセス、すなわち、(1)河川流による河口テラスの形成、(2)波による河口砂州の形成に分離した。本研究では、第一段階として、掃流形式での砂移動現象に限定して検討を行った。以下に、得られた成果を列記する。 1.河口テラスの形式については、簡単なモデルにより、その形式の予測が可能となり、実験結果との対応も良好であった。テラス形状と外力との関係において特徴的な点は、河道内の剪断応力の大小により、テラスの細長比(aspect ratio)が大きく変化する点である。また、導流堤諸元の変化がテラス形状の変化をもたらすことが認められた。従来、導流堤の効果として疎通能力・掃流能力の増加が強調されているが、更に、テラス形状を制御する構造物としての効果を付加する必要がある。 2.後半の河口砂州形成のプロセスにおいては、上記のテラスの形が、その後の河口閉塞に対して大きな影響を有していることが明らかとなった。すなわち、沿岸方向にテラスが広がるほど、波浪の河口部への集中が顕著でなくなり、砕波により河口部へ移動する土砂量が減少し、その結果、河口閉塞の低減がもたらされる。 3.羽越荒川(新潟県)、および北上川(宮城県)における河口データを検討した結果、室内実験で確認されたものと同様のテラス地形が認められた。このことから、テラス地形は、河口部での排出土砂が多く、また土砂の粒径が大きく掃流型式の土砂移動が支配的な場合には、かなり一般的に生じる可能性があるものと考えられる。
波・流れ共存場の砂移動現象に関する研究

田中仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 宇都宮大学

1985 - 1985

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Social Activities 4

氷河と共に暮らす都市の水を守る

2015/06 -

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地球温暖化で氷河が後退し，水資源に黄信号がともるボリビア．東北大学大学院工学研究科の田中仁教授をリーダーとするSATREPSのプロジェクトが，氷河減少と水資源との関係を明らかにした．
「知水講座」（宮城県土木部）

2007/03/09 -

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講演「宮城県沿岸の汀線変化と現状の対策について」
水理公式集プログラム集講習会

2003/12/02 -

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水理公式集プログラム集「港湾・海岸」に関する解説
東北学院大学・防災環境研究所講演会

2003/11/27 -

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講演「東北地方の沿岸環境とその保全」

Media Coverage 19

東日本大震災津波後の河口地形の回復過程とその将来予測

建設通信新聞

2014/04/22

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「建設事業に関する技術開発支援事業」特報版の記事で，研究成果が報道された．
名取川水系の現状を点検、学識経験者が整備状況視察

ミヤギテレビ, 15:50～19:00 OH！バンデスミヤギnews Every

2014/02/27

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内容：宮城県名取市名取川における震災後の復旧状況についてコメント．
北上川堤防、大震災の津波防げず決壊、半壊で７００人犠牲

河北新報

2012/05/17

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2011年東日本大震災津波における北上川河口周辺の被災状況についてコメント
七北田川河口閉塞打破蒲生干潟回復の兆し

河北新報

2012/03/16

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七北田川河口閉塞打破の河川改修工事についてコメントした．
OH!バンデス every 津波と台風で被害蒲生干潟の復活は．．

宮城テレビ

2011/10/06

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津波と台風で被害蒲生干潟の復活は．．
焦点／台風で仙台・蒲生干潟に河口／七北田川、治水に乱れ

河北新報

2011/10/06

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台風で仙台・蒲生干潟に河口／七北田川、治水に乱れ
東松島鳴瀬川河口の砂州津波で消失漁港に高波直撃上流堤防も被害

河北新報

2011/09/09

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東松島鳴瀬川河口の砂州津波で消失し，漁港に高波直撃・上流堤防も被害．自然回復の兆し見えない．
仙台・蒲生の七北田川砂が堆積河口閉塞

河北新報朝刊

2011/08/31

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仙台市七北田川の河口閉塞のメカニズムについて解説．
大津波が旧地形に引き戻す２段構えの防災策を

建設通信新聞

2011/06/09

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大津波が旧地形に引き戻すような地形変化を生じた．２段構えの防災策が求められることを強調．
数字で見る震災

毎日新聞

2011/04/10

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津波が北上川を遡上し，上流５０ｋｍまで至った．
津波，北上川を50キロ逆流東北大分析河口で高さ7メートル

朝日新聞

2011/03/25

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津波，北上川を50キロ逆流東北大分析河口で高さ7メートル
米百俵の精神で人材育成を

建設通信新聞

2011/03/14

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途上国の人材育成において，米百俵の精神の重要性を指摘．自身のボリビアでの事例を説明．
陥没直下にコンクリート片埋設物の可能性も仙台・高森

河北新報

2010/10/14

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陥没直下にコンクリート片埋設物の可能性も仙台・高森
チリ地震津波22キロ上流まで宮城・旧北上川

朝日新聞

2010/03/08

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チリ地震津波22キロ上流まで宮城・旧北上川
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Type: Newspaper, magazine

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八工大・東北大研究グループによる十三湖の環境調査．
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Type: TV or radio program

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Type: TV or radio program

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海岸侵食の機構とその対策について解説．
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ミヤギテレビ

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Type: TV or radio program

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海岸侵食の機構とその対策について解説．

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