Abstract
The coast located in the west of Gono River in Shimane prefecture is divided into three sandy beaches by the small headlands. It is obvious by the shoreline change analysis using aerial-photographs that the erosion begun from Gono river-mouth in 1970 has been spread westward and reached in Wakihashi coast over Mashima headland. Contrarily in the west of Wakihashi coast and the west coast over Ohsaki-hana headland, the shoreline has been advanced. These shoreline changes from 1988 to 2010 were simulated by the shoreline model under the wave condition due to the wave transformation analysis based on the wave observation data in Hamada harbor. The simulated results show that the westward longshore sediment transport has been dominant and the sediment transport rate over the headlands could be estimated. Thus, it is necessary to control the westward longshore transport rate to prevent the erosion from a viewpoint of the existence of the sand transport rate over the headlands.
