EXPERIMENTAL STUDY ON SAND LEAKAGE FROM UNDER COMPOSITE BREAKWATER COVERED WITH WAVE DISSIPATING BLOCKS

Abstract

 In this study, 1/55.8-scale hydraulic experiments modelled on 1/4-scale large experiments in Suzuki et al. (2002) were carried out as a first step to organize what should be considered in determining the sizes of mound gravel and seabed sand for composite breakwaters covered with wave dissipating blocks. Experimental results showed that sand deposition was formed in the seaward part of the mound unlike the 1/4-scale large experiments and 1/16-scale medium-size experiments. This suggested that it would be important to pay attention to the type of sediment transport based on settling velocity, the size ratio of mound gravel to seabed sand, and the permeability of the mound based on hydraulic conductivity.