JDR Vol.16 No.7 pp. 1015-1029
doi: 10.20965/jdr.2021.p1015


Comparisons of Numerical Models on Formation of Sediment Deposition Induced by Tsunami Run-Up

Ako Yamamoto*1,†, Yuki Kajikawa*2, Kei Yamashita*3, Ryota Masaya*4, Ryo Watanabe*4, and Kenji Harada*5

*1Forestry and Forest Products Research Institute
1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan

Corresponding author

*2Social Systems and Civil Engineering, Tottori University, Tottori, Japan

*3International Research Institute of Disaster Science (IRIDeS), Tohoku University, Miyagi, Japan

*4Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Miyagi, Japan

*5Center for Integrated Research and Education of Natural Hazards, Shizuoka University, Shizuoka, Japan

May 25, 2021
August 31, 2021
October 1, 2021
tsunami sediment transport, hydraulic experiment, numerical simulations, model comparisons

Tsunami sediments provide direct evidence of tsunami arrival histories for tsunami risk assessments. Therefore, it is important to understand the formation process of tsunami sediment for tsunami risk assessment. Numerical simulations can be used to better understand the formation process. However, as the formation of tsunami sediments is affected by various conditions, such as the tsunami hydraulic conditions, topographic conditions, and sediment conditions, many problems remain in such simulations when attempting to accurately reproduce the tsunami sediment formation process. To solve these problems, various numerical models and methods have been proposed, but there have been few comparative studies among such models. In this study, inter-model comparisons of tsunami sediment transport models were performed to improve the reproducibility of tsunami sediment features in models. To verify the reproducibility of the simulations, the simulation results were compared with the results of sediment transport hydraulic experiments using a tsunami run-up to land. Two types of experiments were conducted: a sloping plane with and without coverage by silica sand (fixed and movable beds, respectively). The simulation results confirm that there are conditions and parameters affecting not only the amount of sediment transport, but also the distribution. In particular, the treatment of the sediment coverage ratio in a calculation grid, roughness coefficient, and bedload transport rate formula on the fixed bed within the sediment transport model are considered important.

Cite this article as:
A. Yamamoto, Y. Kajikawa, K. Yamashita, R. Masaya, R. Watanabe, and K. Harada, “Comparisons of Numerical Models on Formation of Sediment Deposition Induced by Tsunami Run-Up,” J. Disaster Res., Vol.16 No.7, pp. 1015-1029, 2021.
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Last updated on Jun. 19, 2024