2022 Volume 78 Issue 2 Pages I_409-I_414
Gravity type breakwater is commonly applied to deep water area to ensure harbor calmness. In the case of Wajima Port, a sloping breakwater is applied because there is need for seawater exchange despite the deep water depth. A sloping breakwater covered with wave-dissipating blocks allows deformation. However, improvement method of the breakwater is studied through hydraulic model experiments taking into account the change of wave condition and the deformation of breakwater. The improvement method in this study is proposed to use a structure with a berm on the seaward side. Furthermore, the stability and hydraulic characteristics are confirmed through the experiments. The conclusions of this study are as follows: 1) By changing the height of berm, the stability of the breakwater is improved. 2) By installing a berm, reflection coefficient is reduced. 3) There is no increase in the transmission coefficient by installing a berm. In addition, numerical analysis with CADMAS-SURF is carried out, and the changed condition of the wave overtopping by the berm installation is reviewed.
