Spatial pattern of landslide potensial area by SMORPH, INDEX STORIE and SINMAP method In Pelabuhanratu and surrounding area, Indonesia

Abstract

Landslide is a frequent disaster in Indonesia that is affected by several factors. Cisolok, Cikakak, Pelabuhanratu, and Simpenan are Sub-district that has physical characteristics which can increase the potential of landslides in the area. Therefore, mitigation efforts by potential landslide mapping are needed in the research area. In this research landslide potential map was made by using 3 methods: SMORPH (slope morphology), Index Storie, and SINMAP (stability index mapping). This study is aim to knew the differentiation of spatial pattern of the landslide potential areas by SMOPRH, SINMAP, and Index Storie methods. Spatial analysis was implemented by overlay technique between landslide potential area with landslide location. The result reveal that the research area was dominated by high potential based on the SMORPH method, low by SINMAP, and moderate by Index Storie. The result also reveal that 33% of the total research area has different potential and 7% has the same potential in the results of all three methods. Where areas with high potential in all three methods was distributed in the northern of the study area. The SMORPH method has 19,951 Ha of high potential area and there are 34 landslides in it, SINMAP 2,568 Ha with 32 landlsides, and Index Storie has 4,684 Ha with 21 landslide. The result also explain that in addition to thbeside of slope gradient factor, landuse change factor has a very big affecting for the occurrence of landslide in the research area. Mapping of landslide potential areas in this research is may practically be applied for the regional planning and development of infrastructures in the area.