2D modeling of current patterns and sediment patterns on Pasir Beach, Kebumen

Pasir beach is one of the beaches in the row of the South Coast of Java Island which is located in the Kebumen Regency, Central Java Province. On the sand beach, there is a fish landing port which is in poor condition. Some of the main port facilities are not functioning at all due to sedimentation problems. The purpose of this study is to determine the current pattern and sedimentation pattern on the Pasir beach, especially in the fish landing port area with 2-dimensional modeling. The results of 2-dimensional modeling with RMA2 and SED2D found that fluctuations in current velocity are not significant because the velocity is small. The increase in current velocity fluctuations is more dominantly caused by the influence of the narrow width of the port mouth, the body of water spreads so that the current velocity will also spread. In the sediment simulation, after simulating the distribution of sediment concentration for 10 days, in the location of the Pasir fish landing port, there is a change in the bed elevation due to the pattern of sediment distribution from the river. This basic change is strongly influenced by the concentration of sediment and sedimentation velocity of sediment grains at each location.