CHANGES OF NOURISHED STEEP BEACH IN LAKE KASUMIGAURA AND SIMULATION OF BEACH CHANGES BY CONTOUR LINE CHANGE MODEL

Beach nourishment was carried out at Ukishima area in Lake Kasumigaura in order to recover sandy beaches. Artificial beach slope was set to be steep as much as 1/2. After the nourishment, longshore and offshore sand movement occurred due to the wind wave action. Beach profile changes were measured and sea bottom sampling were conducted. Measured beach changes were compared with the results of the numerical simulation by using the contour line change model. Both results agreed well.