A.A. Sulianto, N. Lusiana, K. Murakami
After field surveys on the Tohoku earthquake tsunami in 2011, coastal engineers recognized the importance of persistent coastal structure to reduce the tsunami damages. It is important to understand the characteristics of tsunami flow formed around the breakwater and rubble mound with three-dimensional configuration. The applicability of CADMAS-SURF has been investigated mainly in two-dimensional wave deformation problems and few investigation has been done in the case of three-dimensional tsunami flow problems. CADMAS-SURF/3D was employed to simulate tsunami flow over the breakwater. In this study, a numerical half-basin domain was considered in 3D simulations. Hososhima Yojima breakwater was selected as the prototype structure. This is one of the breakwaters that are needed to be reinforced to realize a persistent breakwater against a supposed L2 tsunami attack on the eastern side of Kyushu Island. This study firstly discusses the applicability of CADMAS-SURF to the three-dimensional tsunami flow problem. Some hydraulic experiments were conducted to verify the validity of numerical results. This study also discussed some characteristics of tsunami flow over the breakwater such as tsunami flow passes through the gap between caissons, the effect of the partial subsidence of caissons on tsunami flow above the rubble mound, and the characteristics of tsunami flow in around a breakwater. © 2018 World Scientific Publishing Co. Pte. Ltd.
Department of Environmental Engineering, Universitas Brawijaya, Veteran Street, Malang, East Java, 65145, Indonesia; Dept. of Civil and Environmental Engineering, University of Miyazaki, 1-1 Gakuen Kibanadai Nishi, Miyazaki, 889-2192, Japan
