Mapping and Analysing of Landslide Hazard Zone and its Mitigation Using Geographic Information System (Case Study in North Sumedang and South Sumedang Subdistric, Sumedang Distric, West Java)

Abstract

Landslide is the natural disaster that most frequently occurred in the study area of North Sumedang and South Sumedang subdistric. The existing of landslide hazard and risk map s are not yet adequate to be use in policy making. The aim of the research is to provide potential hazard and risk maps to mitigate landslide hazard using geographic information system technology. The result showed that most area in the North Sumedang and South Sumedang subdistrict is moderate landslide hazard covered 8.460 Ha (65,51%), high landslide hazard covered 2.798 Ha (21,67%), low landslide hazard covered 1.570 Ha (12,16%) and very low landslide hazard covered 85 Ha (0,66%). Combining landslide hazard with property value has produced map of landslide risk. Neverthe less most areas are low risk class (7.962 Ha/61,67%) and the high risk areas are only occurred in small places (568 Ha/4,4%). This phenomena showed that area with high potential class of landslide hazard is not always having a high value of risk. The risk is determined by properties value such as: infrastructure, road network and land use, while the landslide hazardous class is determined by natural factors such as: slope, soil type, geology and land use.