APPLICABILITY OF SUB-SAND SYSTEM TO BEACH EROSION CONTROL

Yoshiaki Kawata, Yoshito Tsuchiya

Abstract


We performed experiments in the laboratory under controlled conditions in order to determine the applicability of a sub-sand filter system to the beach erosion control work. The filter system is used to control a flow condition at the sediment-fluid boundary. In the foreshore, it increases the inflowing velocity into the beach and thus results in increasing the threshold of beach sediment movement. The sub-sand filter system accelerates accretion of much beach sediment in the foreshore through the development of a berm under normal wave conditions. When wave conditions change from normal to stormy , it is also applicable to stabilize the beach profile, and thus decrease loss of beach sediment from the foreshore to the offshore.

Keywords


beach erosion; erosion; erosion control; sub-sand system

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