BEACH EROSION IN AREA WEST OF INDRAMAYU ON NORTH JAVA ISLAND SUBJECT TO EASTERLY TRADE WIND

Abstract

 Shoreline changes along the coastal zone of Eletan Bay of 29 km width bounded by the Cimanuk River and Cipunagara River deltas in west Indramayu on Java Island were investigated using satellite images together with UAV images and field observations. The results show that sediment supplied from these rivers is mainly deposited around the river deltas with least supply to the coastal zone of the bay. Under the condition, longshore sand transport occurred due to obliquely incident waves caused by easterly trade wind. Since the bed material is composed of fine material with a small equilibrium slope, bed material supplied from the land was not deposited near the shoreline area, resulting in no shoreline advance in response to the shoreline recession. The sand discharged offshore and deposited in the offshore zone.