GS43 Numerical Investigation on Seabed Plate Effect against Tsunami Tolerance of Breakwater

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  • GS43 防波堤の津波耐性に対する海底板効果の数値的研究

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The Great East Japan Earthquake in 2011 caused a giant tsunami which led serious damage in the Tohoku and Kanto areas. According to studies after the earthquake, breakwaters mounded the bottom of the bay were destroyed by the tsunami and their disaster mitigation effect did not work. For tolerant breakwater of tsunami struck, we investigate effect of submarine plates which are set close to breakwaters. In the present study, we conduct numerical simulations of the flow around breakwaters with the submarine plate. The MARS method is employed to capture the free surface of tsunami and the k-ε model is used as turbulence model. Results show that the submarine plate decreases wave forces of tsunami and a breakwater's tolerance of tsunami is improved.

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