RIVER MOUTH IMPROVEMENT OF HAMA RIVER FLOWING INTO SHIZUOKA COAST AND A MEASURE AGAINST WAVE OVERTOPPING

Abstract

 Several small rivers flow into the Shizuoka coast facing Suruga Bay. At the mouth of these rivers, northward longshore sand transport prevails and coarse material was deposited at the river mouth, resulting in the river mouth closure. In this study, a dynamic equilibrium condition, in which 1.7×10⁵m³/yr of longshore sand transport can continuously develop along the coastline, was produced in the model, and various countermeasures against the river mouth closure were investigated by using the BG model (a three-dimensional model for predicting beach changes based on Bagnold's concept).