Vulnerability Assessment of Landslide Areas in Ci Manuk Upstream Watershed, Garut District, West Java Province

Abstract

Landslide is challenging to detect and predict. Settlements are not always located on ideal land according to designated areas, such as settlements in a landslide area. Ci Manuk Upstream watershed, Garut District, West Java Province, has critical land due to human intervention. The environment is more sensitive to the components in the environmental system, so when it rains, landslide disasters are prone to happen. This study aims to predict and analyze the vulnerability settlement of landslide in Ci Manuk Upstream watershed, Garut District, West Java Province. The research method is done gradually, beginning with using Stability Index Mapping (SINMAP) method to generate a landslide potential area, then using a spatial analysis method to determine the landslide-prone area and finally assessing the vulnerability of the settlements in the landslide area. The results show that 43.88% of the total area is a potential landslide area, then 19.04% is a high landslide-prone area, and 30.80% is the vulnerability of the settlement areas in the high landslide area. This study also shows that the landslide potential area is dominant at slope >25%, dystrudept soil type, and rainfall rate of >3500 mm/year. The landslide-prone settlement areas tend to be in the landslide zone of SINMAP modeling, and vulnerable settlements have tended to be south of the watershed because of the low quality of buildings and high population densities.