Identifications of increase, distribution pattern, and density level of sedimentation using Landsat 7 satellite images in the coastal area

Abstract

Sedimentation at coastal of Cirebon City is caused by considerable abrasion process in Indramayu regency and the impact of sand mining on Gosong Island, Indramayu Regency, besides that, the habit of residents in coastal of Cirebon City who heap up garbage at the coastal for years to utilize the area for residential purpose also contributed significantly the problem of sedimentation in the coastal area of Cirebon City. This research applying remote sensing technology of Landsat 7 2005, 2010, and 2015 using Lemigas Algorithm to gain information of special and temporal increase of sedimentation, distribution pattern, and density level of sedimentation. The result shows that the most significant increase of sedimentation happened at 2010 to 2015 with 46,072 Ha. There are 2 types of distribution pattern at Cirebon City, the first one is the sedimentation that ends in the estuary of river. The other type is the sedimentation caused by the presence of longshore currents which carry sediment and stuck on the coast along coastal of Cirebon City. Identification of natural and artificial sedimentation is carried out based on surveys in the field. The Lemigas Algorithm used only for classification of sedimentation based on density level of sedimentation content (mg/L). This research contributes to the Cirebon City government in resolving the problems of abrasion, accretion, and siltation in coastal areas, for the development of the Cirebon City coastal area to be an asset supported the economy in the future.