ANALISIS PENGGUNAAN LAHAN BAGIAN HULU SUNGAI CILIWUNG DALAM MENGURANGI VOLUME BANJIR JAKARTA DENGAN INTEGRASI CITRA SATELIT DEM SRTM

Abstract

Flooding is a natural disasters phenomenon that often occurs in big cities in Indonesia, one of them is Jakarta. The Consequences of the floods in Jakarta are lowland morphology, high rainfall, large surface flow (run-off), river gradient or drainage gradient is very gentle, tidal influence and siltation of rivers around estuary. Jakarta is a part of the Ciliwung River downstream part, with a low situation of Jakarta makes the role of the Ciliwung upstream part become very important. It is connected with a consequence of the flood runoff that can not be optimally absorbed by the soil, due to changes in land use are not in accordance with their designation as a protected areas. The aims of this study to determine the condition of the Ciliwung upstream part such as changes of land use, condition of morphology and its effect on the volume of flooding in Jakarta. After knowing the changes and morphology that exist in the area through satellite imagery, it can be planned arrangement of space that affect the discharge of water flows into upstream part. This study is geographically located in 106049'40" - 107000'15" East Longitude and 6038'15" - 6046'05" South Latitute. Administratively, Ciliwung upstream part covers 30 villages in Bogor Regency there are 2 villages (Sukaraja Subdistrict), 7 villages (Ciawi Subdistrict), 10 villages (Cisarua Subdistrict) , 11 villages (Megamendung Subdistrict) and 1 village in the East Bogor Subdistrict. Ciliwung upstream part watershed area are 14 860 ha. The method of this study by approach analysis of landforms and land cover. The main data used are Landsat - 7 ETM +, geological map scale of 1 : 100,000 and the earth map scale of 1 : 25,000. In addition, for an extra analysis of geological conditions, also used the image processing results that is Digital Elevation Model. The results used for the basis of land use planning that expected to be one solution to reduction of rainfall that disembogue into the Bay of Jakarta. The analysis results of Landsat satellite imagery with multi-temporal from time to time there are visible changes in lines vegetation area become more bit and pushed by the development in various sectors. With the land use planning on the Ciliwung upstream part, the government is expected to objectify, so the discharge of run-off flowing into Jakarta is reduced. Keywords: upstream part, land use changes, multi-temporal Landsat