Study of Potential Flood and Landslide Susceptibility Based on Geomorphological Characteristics In Sub-Watershed of Gelis, Keling, Jepara

Abstract

F loods and landslides disaster are routine events in Jepara Regency every rainy season. The selected research area is Gelis Sub-watershed located on the north side of Muria volcano . The purpose of this study was identification of geomorphological characteristics and variety of landform in Gelis Sub-watershed for susceptibility analysis of floods and landslides . The method used in this research is survey with purposive sampling technique. D ata a nalysis was performed with the disaster susceptibility using GIS spatial analysis with assisted using ILWIS by applying SMCE method. The weights consistent (eigenvector) resulted from the processing of AHP. The result of reserach are geomorphology map and susceptibility map of flood and landslide in scale 1: 50.000. Sub-watershed Gelis has a complex geomorphological characteristics with variations in landforms such as the volcanic middle slope, volcanic lower slope, volcanic foot, volcanic foot plain, interfluve of volcanic foot, interfluve of volcanic foot plain, floodplain , and fluvio volcanic plain . Gelis Sub-watershed otherwise prone to flood s and landslide s disaster based on susceptibility mapping results. There are three classes of susceptibility, which are high, moderate, and low. H igh susceptibility are in the landform of volcanic middle slope and most of volcanic foot.