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Reika Nomura

Section

International Research Institute of Disaster Science

Job title

Assistant Professor

Degree

Ph.D in Engineering (Tohoku University)
Master of Engineering (Tohoku University)
Bachelor of Engineering (Tohoku University)

researchmap

https://researchmap.jp/reikanomura

J-GLOBAL ID

202101018033970269

ORCID

https://orcid.org/0000-0003-2251-9551

Profile

「大学（University）」の語源が「宇宙(Universitas, ウニベルシタス)」なのって素敵だなと思います

Research History 6

2022/04 - Present

Tohoku University　International Research Institute of Disaster Science Nippon Koei Resilient City with Digital Twin Technologies Joint Research Lab　Assistant Professor
2020/11 - Present

Tohoku University　International Research Institute of Disaster Science Risk Evaluation and Disaster Mitigation Research Division　Assistant Professor
2025/10 - 2025/12

University of Padua　Department of Mathematics　Visiting Researcher
2020/04 - 2020/11

Obayashi corporation　Technology Research Institute
2017/04 - 2020/03

Japan Society for the Promotion of Science　Research Fellowship for Young Scientist DC1
2015/04 - 2020/03

Tohoku University　Inter-graduate School Doctral Degree Program on Scientist for Global Safety

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Education 3

Tohoku University　Graduate School of Engineering　Department of Civil and Environmental Engineering

2015/04 - 2020/03
University of Washington　Department of Applied Mathematics

2018/04 - 2018/05
Tohoku University　Faculty of Engineering　Department of Civil Engineering and Architecture

2011/04 - 2015/03

Committee Memberships 1

Japan Society of Computational Engineering and Science　Study Group on Hypercomplex Disaster Simulation

2024/04 - Present

Professional Memberships 3

The International Association of Computational Mechanics (IACM)

2015/04 - Present
Japan Society of Civil Engineerings

2015/04 - Present
Japan Society for Computational Engineering and Science

2015/04 - Present

Awards 7

Prominent Research Fellow of Tohoku University

2024/02　Tohoku University
The Young Researcher Paper Award

2023/05　The Japan Society for Computational Engineering and Science　Real-time tsunami risk evaluation method by synthetic dynamics and Bayesian update
建設工学研究奨励賞

2022/05
第26回計算工学講演会若手優秀講演フェロー表彰

2021/12　Japan society for Computational Engineering and Science
President's Award for Students

2020/03　Tohoku University
JSCES Scholarship Award

2018/06　Japan society for Computational Engineering and Science
応用力学シンポジウムポスター賞

2015/12　土木学会応用力学委員会　防潮林の減災特性評価を目的としたマルチスケール数値実験

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Papers 29

Influence of the Parameters in Resistance Models for 2D Shallow Water Debris Flow Simulation –A Case Study in Atami City, Japan— Peer-reviewed

Reika Nomura, Nilo Lemuel Dolojan, Chiho Otsuka, Soma Hidano, Shuji Moriguchi, Takeshi Kodaka, Kenjiro Terada

Journal of Disaster Research　20　(6)　1062-1079　2025/12/01

DOI： 10.20965/jdr.2025.p1062 　
Unified Permeability Modeling for Transitional Darcy/Non‐Darcy Flow Based on 3D Pore‐Level Numerical Flow Tests Peer-reviewed

Reika Nomura, Ryota Itto, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada

International Journal for Numerical and Analytical Methods in Geomechanics　2025/10/06

DOI： 10.1002/nag.70095 　
Comparative Performance of Scenario Superposition by Sequential Bayesian Update for Tsunami Risk Evaluation Peer-reviewed

Reika Nomura, Louise Ayako Hirao-Vermare, Saneiki Fujita, Donsub Rim, Shuji Moriguchi, Randall J. LeVeque, Kenjiro Terada

Journal of Disaster Research　19　(6)　896-911　2024/12/01
Publisher: Fuji Technology Press Ltd.
DOI： 10.20965/jdr.2024.p0896 　

ISSN： 1881-2473

eISSN： 1883-8030

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This study aims to evaluate the performance of the previous sequential Bayesian update for synthesizing tsunami scenarios in a diverse database consisting of complex fault rupture patterns with heterogeneous slip distributions. We utilize an existing database comprising 1771 tsunami scenarios targeting the city of Westport (WA, U.S.), which includes synthetic wave height records and inundation distributions resulting from a fault rupture in the Cascadia subduction zone. After preprocessing the training dataset according to the developed framework, Bayesian updates are performed sequentially to evaluate the probability that each training scenario is a test case. In addition to detecting the scenario with the highest probability, i.e., the most likely scenario, we synthesize the scenario by the weighted mean of all the learning scenarios by their probabilities. The accuracies of tsunami risk evaluation based on both resultant scenarios are evaluated from the maximum offshore wave, inundation depth, and its distribution. The results of the cross-validation with five different testing/training datasets showed that the weighted mean scenario has almost comparable performance to that of the most likely scenario. Additionally, the sequential Bayesian update improves the accuracy of both methods if a 3–4 minute observation time window is given, and has an advantage over the benchmark results provided by dynamic time warping with full-time series data.
On the flow conditions requiring detailed geometric modeling for multiscale evaluation of coastal forests Peer-reviewed

Reika Nomura, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada

Advanced Modeling and Simulation in Engineering Sciences　10　(1)　2023/08/24
Publisher: Research Square Platform LLC
DOI： 10.1186/s40323-023-00250-2 　

eISSN： 2213-7467

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Abstract The multiscale evaluation method is applied to assess the influence of detailed geometric modeling of trees on their macroscopic attenuation effect against tsunami-like flow. Specifically, we conduct a series of numerical flow tests (NFTs), i.e., 3D flow simulations in a local test domain (LTD), under various inflow conditions to evaluate the macroscopic flow characteristics in the LTD accommodating an array of either simple cylinder or detailed tree models that mimic a coastal forest. After the procedure of NFTs in the multiscale evaluation method is briefly summarized and the corresponding governing equations and analysis conditions are presented, we introduce two indices for evaluating the macroscopic flow characteristics within the framework of multiscale modeling. Based on the NFT results, we discuss how the modeling scheme for trees influences the macroscopic flow characteristics in terms of these indices and clarify the microscopic mechanisms that influence the macroscopic attenuation property. Additionally, the NFT results are compared with the experimental results to justify these discussions, and key factors are explored in terms of reproducing real phenomena. In addition, to apply the multiscale evaluation method to assess the disaster mitigation performance of various types of ecosystems in a realistic situation, we discuss under what circumstances and with what level of detail vegetation should be modeled.
Sequential Bayesian update to detect the most likely tsunami scenario using observational wave sequences Peer-reviewed

Reika Nomura, Saneiki Fujita, Joseph M. Galbreath, Yu Otake, Shuji Moriguchi, Shunichi Koshimura, Randall J. LeVeque, Kenjiro Terada

Journal of Geophysical Research: Oceans　127　(10)　2022/10/05
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2021JC018324 　

ISSN： 2169-9275

eISSN： 2169-9291
Real-time tsunami risk evaluation method by synthetic dynamics and Bayesian update Peer-reviewed

NOMURA Reika, FUJITA Saneiki, OTAKE Yu, MORIGUCHI Shuji, KOSHIMURA Shunichi, TERADA Kenjiro, HASHIZUME Masahiro

Transactions of the Japan Society for Computational Engineering and Science　2022　20220003-20220003　2022/05/19
Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE
DOI： 10.11421/jsces.2022.20220003 　

ISSN： 1347-8826

eISSN： 1347-8826
Multiscale Evaluation Method of the Drag Effect on Shallow Water Flow through Coastal Forests based on 3D Numerical Simulations Peer-reviewed

Reika Nomura, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada, Randall J. LeVeque

International Journal for Numerical Methods in Fluids　94　(1)　32-58　2021/09/20
Publisher: Wiley
DOI： 10.1002/fld.5046 　

ISSN： 0271-2091

eISSN： 1097-0363
Viscosity Evaluation of Solid-Liquid Mixture based on Direct Numerical Simulation Peer-reviewed

NOMURA Reika, TAKASE Shinsuke, MORIGUCHI Shuji, TERADA Kenjiro

Transactions of the Japan Society for Computational Engineering and Science　2018　(2)　20182007-20182007　2018
Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE
DOI： 10.11421/jsces.2018.20182007 　

ISSN： 1347-8826

eISSN： 1347-8826
A method of numerical viscosity measurement for solid-liquid mixture

Reika Nomura, Kenjiro Terada, Shinsuke Takase, Shuji Moriguchi

Lecture Notes in Applied and Computational Mechanics　86　347-363　2018
Publisher:
DOI： 10.1007/978-3-319-65463-8_17 　

ISSN： 1613-7736

eISSN： 1860-0816
MULTISCALE NUMERICAL EXPERIMENT FOR EVALUATING DISASTER-REDUCTION CHARACTERISTICS OF TIDE-PROTECTION FOREST Peer-reviewed

NOMURA Reika, TAKASE Shinsuke, TERADA Kenjiro, MORIGUCHI Shuji

Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))　71　(2)　I_193-I_201　2015
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejam.71.I_193 　

ISSN： 2185-4661

eISSN： 2185-4661

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We propose a method of multiscale numerical experiments for evaluating disaster-reductoin characteristics of tide-protection forest against tsunami energy. To conduct the experiments in a hierarchical way, a tide-protection forest is stratified into three spatial scales; the branch-scale is the smallest, the forest-scale is the largest and the tree-scale is intermediate. Tide-Protection Forest is assumed to be porous media and we identify its porous term as reduction characteristics. With the help of the stabilized finite element method, several cases of lower-scale analyses are carried out with different initial and boundary conditions to construct a response surface of the overall resistances at the upper-scale. Thus, with this information about the porous medium's characteristics, a whole costal region can be a analysis target with relatively low computational cost to make a risk assessment for structures behind the forest.
Rapid City‐Scale Earthquake Assessment by Combining Numerical Simulation and Sparse Sensing

Dongyang Tang, Hidekazu Usami, Saneiki Fujita, Reika Nomura, Kenjiro Terada, Susumu Ohno, Jia Guo, Masaaki Sakuraba, Kazuya Nojima, Shuji Moriguchi

Earthquake Spectra　2026/05

DOI： 10.1002/esp4.70052 　
Quantification of the impact of historical land-use changes on disaster risk using numerical simulations Peer-reviewed

MORIGUCHI Shuji, YOSHIZAWA Mika, DOLOJAN Nilo, NOMURA Reika, TERADA Kenjiro, SUGAWARA Daisuke, KAWAUCHI Atsushi, EBINA Yuichi, SUZUKI Atsushi, MIZOGUCHI Atsuko, FUJII Yukiyasu, KODAKA Takeshi

Transactions of the Japan Society for Computational Engineering and Science　2025　(2)　20252003-20252003　2025/12/26
Publisher: JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE
DOI： 10.11421/jsces.2025.20252003 　

eISSN： 1347-8826

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In disaster-affected areas, the impact of land use changes from the past to the present on disaster risk is often discussed, but most of these observations are qualitative. However, quantitative analysis could provide valuable information for disaster prevention and mitigation. This study aims to analyze the impact of land use changes through a series of heavy rainfall disaster simulations. Past and present models of a real region that experienced an extreme rainfall disaster were prepared, with flooding and landslides represented in the simulations. The results quantitatively demonstrated that, to reduce flood damage effectively, it is essential not only to implement basin maintenance, but also to prioritize safety in residential area selection and to proceed with land development in a careful manner. Finally, the potential advantages and limitations of the proposed approach are discussed.
Large-area slope stability analysis: Performance comparison of three-dimensional limit equilibrium methods Peer-reviewed

Daichi Sugo, John Y. Choe, Saneiki Fujita, Nilolemuel J. Dolojan, Reika Nomura, Kenjiro Terada, Eiji Tominaga, Kenta Tozato, Shoji Iwanaga, Shuji Moriguchi

SOILS AND FOUNDATIONS　65　(6)　2025/12

DOI： 10.1016/j.sandf.2025.101703 　

ISSN： 0038-0806

eISSN： 2524-1788
Rapid prediction of rainfall-induced landslides over a wide area aided by a simulation-based surrogate model Peer-reviewed

Kenta Tozato, Daichi Sugo, Nilo Lemuel J. Dolojan, Reika Nomura, Kenjiro Terada, Shinsuke Takase, Kenji Kaneko, Shuji Moriguchi

Computers and Geotechnics　188　107480-107480　2025/12
Publisher: Elsevier BV
DOI： 10.1016/j.compgeo.2025.107480 　

ISSN： 0266-352X
An efficient Quantum Approximate Optimization Algorithm with fixed linear ramp schedule for truss structure optimization Peer-reviewed

Junsen Xiao, Naruethep Sukulthanasorn, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Advanced Modeling and Simulation in Engineering Sciences　12　(1)　2025/06/18
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40323-025-00298-2 　

ISSN： 2213-7467

eISSN： 2213-7467
Integrated multihazard study combining qualitative and quantitative analyses of floods, landslides, and debris flows: A case study on the impacts of Typhoon Yun-Yeung on Iwaki City, Fukushima Peer-reviewed

Nilo Lemuel J. Dolojan, Takayuki Takahashi, Masakazu Hashimoto, Akihiro Shibayama, Reika Nomura, Kenjiro Terada, Shuji Moriguchi

International Journal of Disaster Risk Reduction　127　105647-105647　2025/06
Publisher: Elsevier BV
DOI： 10.1016/j.ijdrr.2025.105647 　

ISSN： 2212-4209
EFFECTS OF INERTIAL FORCE TERM ON THE 2D SHALLOW WATER FLOW THROUGH COASTAL FORESTS Peer-reviewed

ISHIZAWA Shuji, NOMURA Reika, MORIGUCHI Shuji, TERADA Kenjiro

Japanese Journal of JSCE　81　(15)　24-15006　2025/03
Publisher: Japan Society of Civil Engineers
DOI： 10.2208/jscejj.24-15006 　

ISSN： 2436-6021

eISSN： 2436-6021

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This study investigates the inﬂuence of the inertial force term in shallow water simulations through a coastal forest. First, we formulate two patterns of 2D shallow water momentum equation which consider trees’ resistance as an external force term consisting of either the drag force or the combination of drag and inertial forces. To obtain the parameters characterizing drag and inertial force, we carry out the 3D numerical ﬂow tests with the 3D tree model. Finally, we conduct several 2D dam break simulations by incorporating the evaluated parameters into the resistance force term. By comparing the wave arrival time and the inundation depth, we could argue that the existence of inertial force has the potential to aﬀect the ultimate evaluation of disaster mitigation performance of trees if they are densely arranged.
Radial basis function-based surrogate computational homogenization for elastoplastic composites at finite strain Peer-reviewed

Akari Nakamura, Yosuke Yamanaka, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Computer Methods in Applied Mechanics and Engineering　436　117708-117708　2025/03
Publisher: Elsevier BV
DOI： 10.1016/j.cma.2024.117708 　

ISSN： 0045-7825
A novel design update framework for topology optimization with quantum annealing: Application to truss and continuum structures Peer-reviewed

Naruethep Sukulthanasorn, Junsen Xiao, Koya Wagatsuma, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Computer Methods in Applied Mechanics and Engineering　437　2025/03

DOI： 10.1016/j.cma.2025.117746 　

ISSN： 0045-7825
Speeding up MPM calculations in MPM-FEM hybrid method incorporating inconsistent domain decomposition patterns for solid and fluid phases Peer-reviewed

Shaoyuan Pan, Soma Hidano, Reika Nomura, Lu Jing, Yohei Miki, Masatoshi Kawai, Shuji Moriguchi, Kengo Nakajima, Kenjiro Terada

Computational Mechanics　75　(6)　1867-1892　2025/02/11
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s00466-025-02601-9 　

ISSN： 0178-7675

eISSN： 1432-0924
B-spline-based material point method with dynamic load balancing technique for large-scale simulation Peer-reviewed

Soma Hidano, Shaoyuan Pan, Keina Yoshida, Reika Nomura, Yohei Miki, Masatoshi Kawai, Shuji Moriguchi, Kengo Nakajima, Kenjiro Terada

Engineering with Computers　2025/01/07
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s00366-024-02099-4 　

ISSN： 0177-0667

eISSN： 1435-5663
Sensitivity Analysis on Critical Combinations of Input Parameters in DEM Granular Flow Analysis

Junsen Xiao, Kenta Tozato, Reika Nomura, Yu Otake, Kenjiro Terada, Shuji Moriguchi

TC 105 INTERNATIONAL SYMPOSIUM　1480　2025

DOI： 10.1088/1755-1315/1480/1/012102 　

ISSN： 1755-1307
Sensitivity analysis on critical combinations of input parameters in DEM granular flow analysis

Xiao, J., Tozato, K., Nomura, R., Otake, Y., Terada, K., Moriguchi, S.

Acta Geotechnica　20　(1)　387-412　2024/12/20
Publisher:
DOI： 10.1007/s11440-024-02499-2 　

ISSN： 1861-1125

eISSN： 1861-1133
Modeling effect of rock shape characteristics on run-out distribution of rockfalls Peer-reviewed

T. Yoshida, R. Nomura, Y. Tuda, I. Yoshida, K. Terada, S. Moriguchi

Soils and Foundations　64　(6)　101531-101531　2024/12
Publisher: Elsevier BV
DOI： 10.1016/j.sandf.2024.101531 　

ISSN： 0038-0806
Scenario Superposition Method for Real‐Time Tsunami Prediction Using a Bayesian Approach Peer-reviewed

Saneiki Fujita, Reika Nomura, Shuji Moriguchi, Yu Otake, Randall J. LeVeque, Kenjiro Terada

Journal of Geophysical Research: Oceans　129　(12)　2024/12
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2024jc021565 　

ISSN： 2169-9275

eISSN： 2169-9291

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Abstract In this study, we propose a scenario superposition method for real‐time tsunami wave prediction. In the offline phase, prior to actual tsunami occurrence, hypothetical tsunami scenarios are created, and their wave data are decomposed into spatial modes and scenario‐specific coefficients by the singular value decomposition. Then, once an actual tsunami event is observed, the proposed method executes an online phase, which is a novel contribution of this study. Specifically, the predicted waveform is represented by a linear combination of training scenarios consisting of precomputed tsunami simulation results. To make such a prediction, a set of weight parameters that allow for appropriate scenario superposition is identified by the Bayesian update process. At the same time, the probability distribution of the weight parameters is obtained as reference information regarding the reliability of the prediction. Then, the waveforms are predicted by superposition with the estimated weight parameters multiplied by the waveforms of the corresponding scenarios. To validate the performance and benefits of the proposed method, a series of synthetic experiments are performed for the Shikoku coastal region of Japan with the subduction zone of the Nankai Trough. All tsunami data are derived from numerical simulations and divided into a training data set used as scenario superposition components and a test data set for an unknown real event. The predicted waveforms at the synthetic gauges closest to the Shikoku Islands are compared to those obtained using our previous prediction method incorporating sequential Bayesian updating.
Application of factorization machine with quantum annealing to hyperparameter optimization and metamodel‐based optimization in granular flow simulations Peer-reviewed

Junsen Xiao, Katsuhiro Endo, Mayu Muramatsu, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

International Journal for Numerical and Analytical Methods in Geomechanics　2024/06/25

DOI： 10.1002/nag.3800 　
Optimization of a Tsunami Gauge Configuration for Pseudo‐Super‐Resolution of Wave Height Distribution Peer-reviewed

Saneiki Fujita, Reika Nomura, Shuji Moriguchi, Yu Otake, Shunichi Koshimura, Randall J. LeVeque, Kenjiro Terada

Earth and Space Science　11　(2)　2024/02
Publisher:
DOI： 10.1029/2023EA003144 　

ISSN： 2333-5084

eISSN： 2333-5084
(High-Temperature Energy, Materials, & Processes Division Subhash Singhal Award) From Electrochemical to Mechanical Modeling of SOFCs and Their Experimental Validation International-journal Peer-reviewed

Tatsuya Kawada, Satoshi Watanabe, Riyan Achmad Budiman, Keiji Yashiro, Kazuhisa Sato, Toshiyuki Hashida, Yuta Kimura, Takashi Nakamura, Koji Amezawa, Masami Sato, Reika Nomura, Mayu Muramatsu, Kenjiro Terada

ECS Transactions　111　(6)　35-46　2023/05/19
Publisher: The Electrochemical Society
DOI： 10.1149/11106.0035ecst 　

ISSN： 1938-5862

eISSN： 1938-6737

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Tohoku University has been conducting research on the mechanical reliability of SOFCs under the financial support by NEDO (New Energy and Industrial technology Development Organization, Japan). Both numerical and experimental approaches have been taken at various levels, from electrochemical to structural analyses. An in-house code, SIMUDEL, was developed to simulate oxygen potential distribution inside the constituent materials in order to account for the chemical strain in cell/stack analyses. Non-linear stress-strain behaviors and inelastic deformation of the materials were characterized to improve the accuracy of the simulation. Predicting actual cell behavior, however, is still difficult, as unexpected factors often remain for each specific case. It is thus important to have in-situ or operando tools to observe the behavior of cells, such as deformation and stress generation. For that purpose, laser profilometer and X-ray stress analyzer were employed with a specially designed cell holder. Methods for evaluating local current density was also proposed. Currently, we are developing a protocol for testing robustness of planar SOFCs. Severe condition tests will be performed, and the results will be analyzed with the above-mentioned simulation.
Variable passing method for combining 3D MPM–FEM hybrid and 2D shallow water simulations of landslide-induced tsunamis Peer-reviewed

Shaoyuan Pan, Reika Nomura, Guoming Ling, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS　28　(1)　1455-1459　2023/05

DOI： 10.1002/fld.5233 　

ISSN： 0271-2091

eISSN： 1097-0363

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Misc. 61

Sequential Updating of Building Fragility Functions through City-Scale Seismic Simulations and Sensor Integration

Dongyang Tan, Naruethep Sukulthanasor, Reika Nomura, Kazuya Nojim, Atsushi Mori, Susumu Ohno, Jia Guo, Seiichi Sato, Shuji Moriguchi, Masaaki Sakurab, Kenjiro Tera

Proceedings of the Conference on Computational Engineering and Science　30　735-740　2025/06
Applicability of Gaussian On-off Encoding for Quantum Annealing to Structural Analysis

Junsen Xiao, Naruethep Sukulthanasor, Endo Katsuhir, Mayu Muramatsu, Reika Nomura, Shuji Moriguchi, Kenjiro Tera

Proceedings of the Conference on Computational Engineering and Science　30　592-596　2025/06
Quantum-assisted design update framework for topology optimization : Comparison of quantum, simulated, and hybrid annealers

Naruethep Sukulthanasorn, Junsen Xiao, Koya Wagatsuma, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Proceedings of the Conference on Computational Engineering and Science　30　581-586　2025/06
A Fundamental Study of Erosion and Channelization in Debris Flows Using a Shallow Water SPH Approach

N Dolojan, R Nomura, K Terada, S Moriguchi

Proceedings of the Conference on Computational Engineering and Science 30　30　229-233　2025/06
Application of a Three-Dimensional Limit Equilibrium Method Based on Ellipsoidal Slip Surfaces and Particle Swarm Optimization to Large-Area Slope Stability Analysis

須郷大地, CHOE John, 外里健太, 野村怜佳, 寺田賢二郎, 渡邊康介, 森口周二

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Fundamental Studies for Rainfall Induced Slope Failure Analysis with Switching Explicit and Implicit MPM

吉田圭那, 飛彈野壮真, 菅井理一, 野村怜佳, 壇上徹, 石澤友浩, 森口周二, 酒井直樹, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Application of u-p mixed formulation stabilized by variational multiscale (VMS) method in implicit MPM

菅井理一, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Seepage Failure Analysis by Semi-implicit MPM with Weighted Least Square B-spline Shape Function

飛彈野壮真, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Investigation of the applicability of quantum singular value transformation as a linear solver for the finite element method in structural analysis.

我妻航也, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Fluid-structure Interaction Analysis using Co-rotational Finite Element Method and Lattice Boltzmann Method

平山大悟, 下畑和希, 野村怜佳, 渡辺勢也, 森口周二, 青木尊之, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Quantification of the impact of historical land use changes on disaster risk using numerical simulations

森口周二, 吉沢美香, DOLOJAN Nilo, 野村怜佳, 菅原大介, 鈴木温, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Strain rate dependent shear resistance models for 2D shallow water type debris flow simulations

野村怜佳, 大塚千穂, DOLOJAN Nilo L. J., 飛彈野壮真, 森口周二, 小高猛司, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
Three-Dimensional Multiscale Analysis Using RBF-Based Surrogate Homogenization Model at Finite Strain

中村明莉, 山中耀介, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　30　2025

ISSN： 1342-145X
個別要素法のためのベンチマーク問題の適切な計算条件の分析

吉川大陽, 肖くん森, 野村怜佳, 寺田賢二郎, 森口周二

土木学会全国大会年次学術講演会(Web)　80th　2025
地震力の空間分布を考慮した極限平衡理論に基づく広域を対象とする三次元斜面安定解析

松田晃汰, 須郷大地, 野村怜佳, 大野晋, 寺田賢二郎, 森口周二

土木学会全国大会年次学術講演会(Web)　80th　2025
MPM-FEMハイブリッド法による土堤浸透過程の再現解析

鈴木祐太, 菅井理一, 飛彈野壮真, 野村怜佳, 森口周二, 小高猛司, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　80th　2025
量子フーリエ変換を用いた均質化解析

飯塚聡, 我妻航也, 中村明莉, 野村怜佳, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　80th　2025
Wide-area slope stability analysis considering 3D geological structure

森口周二, 須郷大地, どろはんにろれむえるふにお, 野村怜佳, 寺田賢二郎, 渡邊康介, 冨永英治, 岩永昇二, 高橋一雄

地盤工学会誌(Web)　73　(5)　2025

ISSN： 2435-5348
水災害・土砂災害の被害予測・軽減のための計算力学—特集高まる防災シミュレーションへの期待

野村怜佳

計算工学 = Journal of the Japan Society for Computational Engineering and Science / 日本計算工学会会誌委員会編　30　(2)　4935-4938　2025
Publisher: 東京 : 日本計算工学会
ISSN： 1341-7622
Iwaki City Rainfall Hazard Simulation: Insights on Floods, Landslides, and Debris Flows

Nilo Dolojan, Reika Nomura, Masakazu Hashimoto, Akihiro Shibayama, Shuji Moriguchi, Kenjiro Terada

Proceedings of the Conference on Computational Engineering and Science　29　1372-1375　2024/06
Sensitivity Analysis on Optimal Combinations of DEM Input Parameters in Granular Flow Simulations

Junsen Xiao, Kenta Tozato, Reika Nomura, Yu Otake, Kenjiro Terada, Shuji Moriguchi

Proceedings of the Conference on Computational Engineering and Science　29　1001-1004　2024/06
Application of FMQA in Hyper-parameter Optimization and Metamodel-based Optimization in DEM Granular Flow Simulations

Junsen Xiao, Katsuhiro Endo, Mayu Muramatsu, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Proceedings of the Conference on Computational Engineering and Science　29　922-927　2024/06
Large-area Three-dimensional Slope Stability Analysis based on Limit Equilibrium Theory with the Aid of DBSCAN

須郷大地, 藤田真粹, DOLOJAN Nilo, 外里健太, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　29　2024

ISSN： 1342-145X
Application of Quantum Annealing to Slope Stability Analysis

外里健太, JUNSEN Xiao, 須郷大地, 山内翔太, 野村怜佳, 森口周二, 高瀬慎介, 金子賢治, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　29　2024

ISSN： 1342-145X
Trees geometry modeling for 3D numerical flow tests on its inertial force effects

野村怜佳, 石澤修司, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　29　2024

ISSN： 1342-145X
Real-time Tsunami Forecast with Scenario Superposition using Bayesian Approach

藤田真粹, 野村怜佳, 森口周二, 大竹雄, LEVEQUE Randall J., 寺田賢二郎

計算工学講演会論文集(CD-ROM)　29　2024

ISSN： 1342-145X
計算固体力学における最小化問題に対する量子アニーリングの適用性に関する基礎的検討

我妻航也, 肖くん森, 山中耀介, 野村怜佳, スクタナソーンナルテープ, 村松眞由, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　79th　2024
都市規模の数値シミュレーションによる非構造部材の耐震性能に着目した地震リスク評価

山岸広祐, 湯東暘, 野村怜佳, 森口周二, 寺田賢二郎, 野島和也, 櫻庭雅明, 佐藤誠一

土木学会全国大会年次学術講演会(Web)　79th　2024
流体構造連成解析に向けた共回転定式化とレベルセット法

平山大悟, 野村怜佳, 森口周二, 青木尊之, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　79th　2024
XPICを用いたMPMによる飽和土流動・衝突解析におけるパラメータスタディー

吉田圭那, 飛彈野壮真, 野村怜佳, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　79th　2024
現代と過去の実地形を対象とした豪雨災害シミュレーション

吉沢美香, DOLOJAN Nilo Lemuel J., 野村怜佳, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　79th　2024
防潮林の津波減衰効果評価を目的とした2次元浅水長波解析における慣性力の影響

石澤修司, 野村怜佳, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　79th　2024
Fundamental studies for saturated soil flows and its impact behaviors using Material Point Method with XPIC interpolation

吉田圭那, 飛彈野壮真, 野村怜佳, 森口周二, 寺田賢二郎

地盤工学研究発表会(Web)　59th　2024
Clustering aided wide-area slope stability analysis based on limit equilibrium theory

中村優見, 須郷大地, 野村怜佳, 森口周二, 寺田賢二郎

地盤工学研究発表会(Web)　59th　2024
On the modeling of resistance force for two-dimensional sediment flow simulations

大塚千穂, 飛彈野壮真, DOLOJAN Nilo, 野村怜佳, 森口周二, 寺田賢二郎

地盤工学研究発表会(Web)　59th　2024
QAにおけるGaussian on-offエンコーディングの構造解析に対する適用性に関する検討

XIAO Junsen, SUKULTHANASORN Naruethep, 遠藤克浩, 村松眞由, 野村怜佳, 森口周二, 寺田賢二郎

日本機械学会計算力学講演会論文集(CD-ROM)　37th　2024

ISSN： 2424-2799
Rapid Prediction of Regional Landslide during Rainfall Using Gaussian Process Regression and Spatial Mode Decomposition

外里健太, 須郷大地, DOLOJAN Nilo, 野村怜佳, 高瀬慎介, 金子賢治, 寺田賢二郎, 森口周二

地盤工学シンポジウム論文集(Web)　64th　2024
A simulation on rainfall-earthquake induced landslide over wide area using the limit equilibrium method

Iskandar Iskandar, Daichi Sugo, Dolojan Nilo, Nomura Reika, Moriguchi Shuji, Terada Kenjiro, Muslim Dicky, Arifianti Yukni, Afif Hauna, Pamela Pamela

Proceedings of the Conference on Computational Engineering and Science　28　11-14　2023/05
Seismic Risk Assessment with Fragility Function using the City-scale Numerical Simulation

Dongyang Tan, Naruethep Sukulthanasor, Reika Nomura, Kazuya Nojim, Atsushi Mori, Susumu Ohno, Jia Guo, Seiichi Sato, Shuji Moriguchi, Masaaki Sakurab, Kenjiro Terada

Proceedings of the Conference on Computational Engineering and Science　28　1-5　2023/05
Quantification of the Contribution Ratio of DEM Input Parameters on Granular Flow Simulations

Junsen Xiao, Kenta Tozato, Reika Nomura, Shuji Moriguchi, Yu Otake, Kenjiro Terada

Proceedings of the Conference on Computational Engineering and Science　28　343-346　2023/05
Implementing 2D shallow water equations to simulate debris flows using SPH

Nilo Dolojan, Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Proceedings of the Conference on Computational Engineering Science　28　75-78　2023/05
Rapid prediction of rainfall-induced landslides for a wide area using slope stability analysis results

外里健太, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　28　2023

ISSN： 1342-145X
Optimization of Offshore Gauge Configuration with Robust Principal Component Analysis

藤田真粹, 野村怜佳, 大竹雄, 越村俊一, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　28　2023

ISSN： 1342-145X
Modeling the Influence of Rock Shape on Run-out distribution of Rockfall

吉田大活, 野村怜佳, 森口周二, 寺田賢二郎, 津田悠人, 吉田郁政

計算工学講演会論文集(CD-ROM)　28　2023

ISSN： 1342-145X
Tsunami risk evaluation by the combined use of heterogenous datasets

野村怜佳, 大竹雄, 森口周二, 越村俊一, LEVEQUE Randall J., 寺田賢二郎

計算工学講演会論文集(CD-ROM)　28　2023

ISSN： 1342-145X
A Numerical Study on the Characterization of Permeability Reduction in Non-Darcy Flows

一藤亮太, 橘一光, 野村怜佳, 高瀬慎介, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　28　2023

ISSN： 1342-145X
Wide-area Slope Stability Analysis based on Limit Equilibrium Theory

須郷大地, 藤田真粹, 外里健太, 野村怜佳, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　28　2023

ISSN： 1342-145X
Development of real-time tsunami risk assessment method by combining numerical simulation and machine learning

野村怜佳

建設工学研究振興会年報　(58)　2023

ISSN： 0288-9994
Slope stability analysis of a real wide-area using 3-D simplified Bishop’s method and Hovland’s method

中村優見, 須郷大地, 外里健太, 野村怜佳, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　78th　2023
A Study on Resistance Models and its Applicability for Large-scale Debris Flow Simulations

大塚千穂, 飛彈野壮真, NILO Dolojan, 野村怜佳, 森口周二, 寺田賢二郎

土木学会全国大会年次学術講演会(Web)　78th　2023
Slope stability analysis during heavy rainfall using the three-dimensional Limit Equilibrium method over a wide area

須郷大地, 藤田真粹, 外里健太, 野村怜佳, 森口周二, 寺田賢二郎

地盤工学研究発表会(Web)　58th　2023
On reasonable observation periods in the sequential real-time tsunami risk assessment based on POD technique

Louise A., Hirao Vermare, Saneiki Fujita, Reika Nomura, Yu Otake, Shuji Moriguchi, Kenjiro Terada, Randall J. Leveque

Proceedings of the Conference on Computational Engineering Science　27　1049-1053　2022/06
A 2D-3D coupling strategy for MPM-FEM hybrid analysis of landslide-induced tsunamis

Shaoyuan Pan, Reika Nomura, Shinsuke Takase, Shuji Moriguchi, Kenjiro Terada

Proceedings of the Conference on Computational Engineering Science　27　34-36　2022/06
Evaluation of Forces Acting on Behind Structures by Rigid Drifting Objects Using Three-Dimensional Fluid-Structure Coupled Analysis

一藤亮太, 野村怜佳, 高瀬慎介, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　27　2022

ISSN： 1342-145X
Gauge Configuration Optimization for Real-time Tsunami Forecast with POD

藤田真粹, 野村怜佳, 越村俊一, 大竹雄, 森口周二, 寺田賢二郎, 高瀬慎介, 福谷陽, 桜庭雅明, 野島和也, 橋詰正広

計算工学講演会論文集(CD-ROM)　27　2022

ISSN： 1342-145X
Relatime tsunami risk estimation approach developement using particle filter

野村怜佳, GALBREATH Joseph, 越村俊一, 大竹雄, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　26　2021

ISSN： 1342-145X
Surrogate Modeling for Real-Time Prediction of Tsunami Inundation Area

Joseph Galbreath, Reika Nomura, Shuji Moriguchi, Shunichi Koshimura, Kenjiro Terada

Proceedings of the Conference on Computational Engineering and Science　25　3p　2020/06
Instructions for Preparation of Manuscripts for The Proceedings of Computational Engineering Conference of JSCES

野村怜佳, 高瀬慎介, 森口周二, 寺田賢二郎

計算工学講演会論文集(CD-ROM)　24　2019

ISSN： 1342-145X
Numerical evaluation of viscous dissipation for flow involving coastal forest

野村怜佳, 寺田賢二郎, 高瀬慎介, 森口周二

計算工学講演会論文集(CD-ROM)　23　2018

ISSN： 1342-145X
流体土砂連成解析のための固液混合流体モデルの構築

野村怜佳, 寺田賢二郎, 高瀬慎介, 森口周二

計算工学講演会論文集(CD-ROM)　22　2017

ISSN： 1342-145X
防潮林による津波減衰効果を評価するためのマルチスケール数値実験

野村怜佳, 高瀬慎介, 寺田賢二郎, 森口周二

計算工学講演会論文集(CD-ROM)　20　2015

ISSN： 1342-145X

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Presentations 33

数値シミュレーションで立ち向かう自然災害～高校の数学・物理はどうやって防災研究に役立つのか～ Invited

野村怜佳

八戸工業大学地域産業総合研究所防災科学フォーラム2026　2026/01/24
Strain-rate dependent shear resistance model for debris flow simulations in 2D shallow water equation

Reika Nomura, Chiho Otsuka, Soma Hidano, Nilo Lemuel Dolojan, Shuji Moriguchi, Takeshi Kodaka, Kenjiro Terada

The 4th International Conference on Computational Engineering and Science for Safety and Environmental Problems (COMPSAFE2025)　2025/07/03
数値シミュレーションとデータサイエンスの融合による津波リスク評価技術の開発 Invited

Reika Nomura, Shuji Moriguchi, Kenjiro Terada

2025/06/24
Strain rate dependent shear resistance models for 2D shallow water type debris flow simulations

2025/06
２次元広域土石流解析におけるひずみ速度依存型抵抗力モデルに関する検討

野村怜佳, 大塚千穂, Nilo Dolojan, 飛彈野壮真, 森口周二, 小高猛司, 寺田賢二郎

計算工学会多元災害シミュレーション研究会　2025/03/28
浅水長波型土石流解析のためのせん断抵抗力モデルの開発 Invited

野村怜佳

日本地すべり学会東北支部 2024 年度第3回講演会・研究発表会実施報告　2025/03/14
On the need for the inertial effects for evaluating the mitigation performance of the coastal trees in 2D unsteady tsunami flow simulations

R.NOMURA, S.ISHIZAWA, S. MORIGUCHI, K. TERADA

16th World Congress on Computational Mechanics and 4th Pan American Congress on Computational Mechanics (WCCM-PANACM2024)　2024/07/25
Trees geometry modeling for 3D numerical flow tests on its inertial force effects

2024/06
Real-time tsunami risk evaluation method by synthetic dynamics and Bayesian update

Reika Nomura, Saneiki Fujita, Yu Otake, Shuji Moriguchi, Shunichi Koshimura, Randall J. LeVeque, Kenjiro Terada

6th German-Japanese Workshop on Computational Mechanics　2023/12/05
Tsunami risk evaluation by the combined use of heterogenous datasets

2023/05
数値シミュレーションとデータサイエンスの融合による津波リスク評価技術の開発 Invited

野村怜佳

土木学会応用力学委員会計算力学小委員会×α 関東地区フォーラム　2022/08/26
Impact Force Evaluation in 2D Debris Flow Simulations Based on Steep-Slope Shallow Water Equation International-presentation

Reika Nomura, So Fujisawa, Nilo L Dolojan, Shuji Moriguchi, Antonia Larese, Kenjiro Terada

HYDROROM 2026 workshop　2026/02/26
インクルーシブ防災と数値シミュレーション

Reika Nomura, Shuji Moriguchi, Kenjiro Terada

Sendai Bosai Mirai Forum 2024　2024/03/09
Real-time Tsunami Forecast with Scenario Superposition using Bayesian Approach

29th Conference on Computational Engineering and Science　2024/06
Application of transfer learning techniques to heterogenous data sets for effectively performing tsunami scenario detection

Reika Nomura, Saneiki Fujita, Yu Otake, Shuji Moriguchi, Shunichi Koshimura, Randall J. LeVeque, Kenjiro Terada

20th Annual Meeting AOGS2023　2023/08/04
On the flow conditions requiring detailed geometric modeling for multiscale evaluation of coastal forest

R. Nomura, S. Takase, S. Moriguchi, K.Terada

22nd Computational Fluid Conference (CFC2023)　2023/04
Improvement of a tsunami scenario detection framework by using synthetic geodetic data

Reika Nomura, Saneiki Fujita, Louise A., Hirao Vermare, Yu Otake, Shuji Moriguchi, Diego Melgar, Randall J. LeVeque, Kenjiro Terada

15th World Congress on Computational Mechanics & 8th Asian Pacific Congress on Computational Mechanics　2022/08/02
地盤変動データの利用による逐次更新型津波シナリオ推定の精度向上に関する検討

野村怜佳, 大竹雄, 森口周二, Diego Melgar, Randall J. LeVeque, 寺田賢二郎

第25回応用力学シンポジウム　2022/05/28
Real-time tsunami forecast/update system by combined use of TUNAMI-N2 simulations and POD: A case study in Nankai subduction zone in Japan

R. Nomura, J. Galbreath, Y. Otake, S. Koshimura, S. Moriguchi, K. Terada

MMLD-CSET 2021　2021/09/27
On the flow conditions requiring detailed tree modeling to estimate the tsunami mitigation performance

R. Nomura, S. Takase, S. Moriguchi, K.Terada

30th International Tsunami Symposium　2021/07/02
Realtime tsunami risk estimation approach development using particle filter

26th Conference on Computational Engineering and Science　2021/06
Evaluation of trees’ drag effects in 2D shallow water flow by 3D direct simulations

R. NOMURA, S. TAKASE, S. MORIGUCHI, K.TERADA

IUGG2019　2019/07/14
防潮林内流れ解析のための数値実験による粘性散逸率評価

野村怜佳, 高瀬慎介, 森口周二, 寺田賢二郎

第23回計算工学講演会　2018/06
二次元広域流れにおける樹木抵抗評価のための三次元数値実験手法

野村怜佳, 高瀬慎介, 森口周二, 寺田賢二郎

第24回計算工学講演会　2019/05
Multiscale numerical evaluation for tsunami mitigation performance of coastal vegetation considering tree breakage and withdrawal

R.NOMURA, S.TAKASE, S. MORIGUCHI, K. TERADA

13th World Congress on Computational Mechanics and 2nd Pan American Congress on Computational Mechanics　2018/07
Multiscale numerical evaluation for disaster mitigation effects and Limitations of coastal vegetation

R. NOMURA, S.TAKASE, S.MORIGUCHI, K.TERADA

ECCM-ECFD2018　2018/06
エネルギー散逸率に基づく防潮林内流れの評価

野村怜佳, 高瀬慎介, 森口周二, 寺田賢二郎

第21回応用力学シンポジウム　2018/05
Numerical Viscosity Measurement Method for Solid-Liquid Mixture

R. NOMURA, S. TAKASE, S. MORIGUCHI, K. TERADA

5th International Conference on Particle-based Methods (PARTICLE2017)　2017/09
Modeling of Solid-Liquid Mixture for Fluid-Sediment Interaction Analysis

24th Conference on Computational Engineering and Science　2017/05
Virtual testing-based Homogenization for Solid-Liquid Mixture

R. NOMURA, Shinsuke TAKASE, Shuji MORIGUCHI, Kenjiro TERADA

19h International Conference on Finite Elements in Flow Problems (FEF 2017)　2017/04
Virtual Tests For Viscosity Measurement of Solid-Liquid Mixed Fluid

R. NOMURA, S. TAKASE, S. MORIGUCHI, K. TERADA

Special workshop MULTISCALE MODELING OF HETEROGENEOUS STRUCTURES　2016/09
Multiscale Numerical Experiment for Evaluating Effect of Coastal Forest

R. NOMURA, S. TAKASE, S. MORIGUCHI, K.TERADA

The 3rd International Conference on Computational Design in Engineering (CODE2015)　2015/12
Multiscale Numerical Experiment for Evaluating Tsunami Damping Effects of Coastal Forest

Conference on Computational Engineering and Science　2015/06

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Research Projects 6

A novel approach for risk reduction of heavy rain disaster using a digital shadow with physics-based modeling

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

2024/04/01 - 2028/03/31
樹木の「かたち」がもたらす津波減災効果を解明するマルチスケール評価手法の提案

野村怜佳

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究

Institution: 東北大学

2023/04/01 - 2026/03/31
High-definition Virtualization of sediment disaster by highly accurate and efficient numerical simulation

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

2022/04/01 - 2026/03/31
機械学習とベイズ更新を用いたリアルタイム津波リスク評価手法の開発

野村怜佳

Offer Organization: 日本学術振興会

System: 科学研究費助成事業研究活動スタート支援

Category: 研究活動スタート支援

Institution: 東北大学

2021/08 - 2023/03

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発生と同時に伝播・遡上よりもはるかに早く沿岸部リスクを予測するリアルタイム津波リスク評価技術は，信頼性と即時性を両立する必要がある．この二つの性能は近い将来その到来が憂慮されている南海トラフ沖地震津波で，さらに高い水準で両立することを求められている．こうした要求に応えるために，既存手法に替わる，新しいリアルタイム津波リスク評価技術の開発が望まれる．本研究では，津波シミュレーション技術と，教師なし学習（固有直交分解），ベイズ理論に基づく最尤シナリオ推定という３つの要素技術によって，信頼性と即時性の両方を兼ね備えた，新しいリアルタイム津波予測技術を開発することを目的とする． 2021年度は要素技術①（固有直交分解）と要素技術②（ベイズ理論による最尤推定・更新）の技術実装および連携を完了させ，最尤津波シナリオ同定システムの開発をおおよそ完了させた．TUNAMI-N2（要素技術③）によって生成された666件の南海トラフ沖地震・津波シナリオデータベースを学習データとテストデータに分割し，開発システムに適用することで，そのシナリオ推定精度や妥当性の検証を行った．テストデータを実際の災害時に得られる観測データに見立て，擬似的にリアルタイム最尤津波シナリオ同定を擬似的に行った結果，学習データの中から最大波高や津波到達時刻，津波波源となる震源断層の位置や種々パラメータが非常に類似したシナリオが同定されていることを確認できた．得られた一連の成果は，国内外での学術集会に参加し，口頭発表を行うことで積極的にアウトリーチ下．すそ野の広い会議を選んで発表したことから，津波工学や地震工学，データサイエンスなど様々な分野の専門家たちと有意義なディスカッションを行うことができ，開発手法のブラッシュアップに必要な課題を明確化できた．
Numerical simulation of ground motion by synthesized representation of transition between solid and liquid

Terada Kenjiro

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

2019/04/01 - 2022/03/31

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We develop a semi-implicit MPM to properly express the mechanical behavior of unsaturated soil based on Biot's mixture theory. The new contribution of this study is the incorporation of the fractional-step method into the MPM to solve the pore water pressure implicitly, which improves the numerical stability and computational efficiency. Moreover, the time increment can be determined without considering the magnitude of water permeability because the interaction between solid and liquid phases is evaluated using the intermediate velocity. Several numerical examples are presented to demonstrate the capability and performance of the proposed method for analyses of unsaturated soils. In particular, a validation analysis is carried out using a model experiment of infiltration-induced landslide.
時空間マルチスケール新理論による津波防災施設の最適設計への挑戦

野村怜佳

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

2017/04/26 - 2020/03/31

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本年度は，前年度得られた成果に対して多面的な検証を行ったうえで，本研究が提案する理論を広域シミュレーションへと実装する段階まで進捗させた．前年度行った樹木モデルを用いた三次元数値実験に対して，比較実験として同配置・同寸法の円柱群モデルを用いた三次元数値実験を行った．一連の数値実験には，所属組織の有する計算機に加えて，共同利用制度によって利用権を得た外部の計算資源も活用された．多くの従来研究が防潮林を模擬した装置として採用していた円柱群モデルに対して，本研究が提案するマルチスケール理論に基づく抵抗評価を行ったところ，樹木群モデルと比較して水深や流体力の低減効果が劣るという評価結果が得られた．これにより，本研究が数値実験において採用している樹冠を有する樹木モデルが，既往の円柱群モデルと比較して，実際の抵抗効果を評価する上でより適切である可能性を定量的に示したと同時に，提案手法が枝や葉などの樹冠形状に起因する抵抗効果を合理的に評価できていることを確認できた．このような検証を行ったうえで本研究が提案する一連の理論・評価手法を，実災害時の津波遡上・浸水状況の予測に用いられる二次元浅水長波解析へと適用することを行った．得られたシミュレーションの結果から，樹幹部浸水，樹冠部浸水，全浸水という三つの浸水形態それぞれにおいて水理実験で確認されるような水面形状を得ることが確認された．このような結果から，本研究が提案する理論，およびそれに基づく評価手法などは，防潮林の減災効果を考慮した浸水予測シミュレーションの更なる高度化に貢献しうることを示した．また，非定常状態，定常状態のそれぞれの状態において提案理論が合理的な予測を提案できるかどうか調査することで，時空間マルチスケール理論へ発展させることを目指した．

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Teaching Experience 2

Introductory Science Experiments　Tohoku University
建築・社会環境工学演習A　東北大学

Other 1

ダイバーシティに関するGood Practice「藤田あき美先生（a.k.a 天文物理学者BossB）にインタビュー」

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日本工学アカデミージェンダー委員会ダイバーシティに関するGood Practice 第8回インタビュアー，（記事 https://www.eaj.or.jp/?name=gender-gp8）