BEACH EROSION ON ICHINOMIYA AND HITOTSUMATSU COASTS OWING TO TYPHOON WAVES IN SUMMER IN 2015

Abstract

 Beach was severely eroded on the Hitotsumatsu coast located in the south part of Kujukuri Beach during the typhoons in October 2014. In summer in 2015, four typhoons hit the coast, causing further erosion on the Hitotsumatsu and Ichinomiya coasts immediately north of the Hitotsumatsu coast, and sand dune was eroded. On both coasts, the sandy beach width has gradually reduced owing to successive erosion, and storm waves hit these coasts under the condition, resulting in severe erosion which cannot be solved using the ordinary protective measures. In this study, field observation was carried out to investigate the field conditions, and future measures were discussed.