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JDR Vol.17 No.4 pp. 532-540
(2022)
doi: 10.20965/jdr.2022.p0532

Paper:

Tsunami-Induced Drift Motion and Numerical Simulation Using Various Models

Riko Morita*, Kazuya Nojima**, Yu Chida***, and Taro Arikawa*,†

*Faculty of Science and Engineering, Chuo University
1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan

Corresponding author

**Research and Development Center, Nippon Koei Co., Ltd., Tsukuba, Japan

***Port and Airport Research Institute, Yokosuka, Japan

Received:
October 11, 2021
Accepted:
January 28, 2022
Published:
June 1, 2022
Keywords:
tsunami, drift motion, hydraulic experiment, numerical simulation
Abstract

In this study, laboratory experiments were conducted to observe drifting of objects transported by a tsunami. Tsunami-induced drift motion was simulated using various numerical models, and the results were compared. Experiments were performed with and without obstacles in the terrain, and the differences were assessed. The spread of debris occurred faster in the presence of an obstacle. In the absence of structures in the flow, the debris did not shift perpendicular to the flow direction in any of the numerical models. The experimental results were generally consistent with the calculated results, although they varied in a normally distributed manner. However, when there was a downstream structure, the uncertainty of the drift motion was not accurately simulated. Furthermore, it was observed that debris moved behind obstacles. A numerical model that calculated the collision force between debris using momentum conservation reproduced this phenomenon. Thus, the numerical model with the drag and inertia coefficients was fairly accurate.

Cite this article as:
R. Morita, K. Nojima, Y. Chida, and T. Arikawa, “Tsunami-Induced Drift Motion and Numerical Simulation Using Various Models,” J. Disaster Res., Vol.17, No.4, pp. 532-540, 2022.
Data files:
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Last updated on Sep. 27, 2022