SEASONAL BEACH PROCESS AROUND ARTIFICIAL REEF AT IDA BEACH IN SHICHIRI-MIHAMA COAST

Abstract

This paper is intended to estimates easonal beach process and wave deformations around artificial reefs at the Ida beach in the Shichiri-Mihamac oast in Mie Prefecture. It is clear that almost regions occurredbeach erosion, especially Udono port region located on the left bank of the Kumano river, as the coastal line faced to sea, the beach protectionw orks weres truckb y strong storms. In order to prevente rosion and make a stableb each, the application of beach nourishment behind artificial reefs was examined by Mie Prefectural Government. A series of surveys and studies on sand drift and wave conditions were conducted in order to examine the sand drift process, the possibility of applying beach nourishment and its executive way at the Ida beach. There are the formation of berm and tombolo topography behind artificial reefs. Resultsw ere estimated on the sediment volume and the predominant direction of sand transport and the correlation between longshores and transport volume and wave condition. On the basis of these results, the amount of sediment transport in longshored irection were estimated thirty thousands cubic meters a period of typhoon season at the boundary.