BEACH CHANGES AND MEASURES AGAINST BEACH EROSION ON HASSE COAST IN KANAGAWA PREFECTURE

Abstract

 The BG model (a model for predicting three dimensional beach changes based on Bagnold's concept) was applied to the investigation of the effect of beach nourishment on the Hasse coast in Kanagawa Prefecture. The southward longshore sand transport was induced due to the wave sheltering effect of the breakwater of Hasse fishing port, resulting in erosion north of the fishing port. As a soft measure against beach erosion, sand back pass from behind the breakwater to the north part was considered. The results showed that the sand back pass with a rate of 500 m³/yr was effective to recover sandy beach.