WAVE SCOUR AROUND THE PILE-SUPPORTED WAVE ABSORBING BREAKWATER WITH LOW CROWN HEIGHT BY MOVABLE-BED MODELS FOR STEEP-SLOPE CONDITIONS

Abstract

 About the pile-supported wave absorbing breakwater with a low crown height, we have examined the characteristics of local scouring around the structure in mild-slope conditions. In this study, we conducted the hydraulic model test with steep-slope movable-bed for scour around the structure, that the increase in scour depth is around the pile side of the onshore, and a similar trend in mild-slope conditions was found. In addition, in a large wave height condition, due to the influence of plunging breaker, scour has occurred in the onshore, and deposition has occurred in the offshore. By installing the countermeasure against local scour, we confirmed the effectiveness of measures to reduce the flow velocity in the sediment.