EXPERIMENNTAL STUDY ON CURRENT CHARACTERISTIC AND TRANSMITTED WAVE CHARACTERISTIC IN PERMEATED BREAKWATER

Abstract

  In recent yeas, `permeable' breakwaters have been constructed in closed seas such as inner bays for the improvement in water quality; however, these breakwaters permit high transmitted waves compared with normal breakwaters. This study, therefore, installed the model of the vertical wave-dissipating block breakwater with permeate holes, with a scale ratio of 1/30 and 1/18, in a wave flume and then measured the transmitted flow velocity and wave height at the backward of the breakwater. The effect of the permeate holes in exchange of the water at the forward and backward sides of the breakwater became most significant at LWL. The transmission coefficient at LWL was larger than that at HHWL when wave-overtopping rate was large.