REDUCTION OF WAVE OVERTOPPING AND WATER SPRAY ON NON-WAVE-OVERTOPPING TYPE SEAWALL WITH USING VERTICAL WALL

Abstract

Authors proposed a non-wave overtopping type seawall (refer as Flaring Shaped Seawall: FSS) with a deep circular cross section. Through a series of studies, they had already confirmed that the FSS satisfies a non-wave overtopping condition with an extremely lower crown height in comparison with a conventional wave absorbing upright seawall. In this study, the reduction effects of both wave overtopping and water spray by the FSS were investigated through hydraulic experiments. And then, in order to reduce the water spray on the FSS effectively, we proposed a vertical wall attached at the tip of the FSS as a technical device. It was confirmed that the vertical wall effectively reduces the spray on the FSS, and the quantity of spray becomes smaller than that on the upright seawall.