Landslide Zoning with GIS Analysis Method: Case Study Cipelah And Its Surroundings Area, Rancabali Subdistrict, Bandung Regency, West Java

Abstract

Mass Movement often occur in Cipelah, especially when the rainy season arrives, it caused either physical damage and/or casualties. All these conditions make the Cipelah belong to areas that are quite a high potential for landslides. With the development of the human activity to prevent and anticipate natural disasters from landslides, a landslide risk map of Cipelah is needed, by a combination of vulnerability maps and hazard maps as important considerations in landslide prevention and mitigation. This study was conducted to map and analyze the potential of ground movement by a quantitative method. Direct observation was done by taking into account internal factors (lithology) and external factors (slope, rainfall, and land-use). The quantitative method was done by analysis based on Geographic Information System (GIS) on the parameters that have been weighted, including lithology, geological structure, slope, rainfall, and land-use. The research area expresses steep slopes dominantly composed of Andesitic Breccia and Tuff Breccia and has an average rainfall of 253 mm/year. This research brings about a map of prone to landslides, that is divided into two zones including the medium and high zone; medium zone with an area of 125.64 m2 (12%) and the high zone with an area of 921.36 m2 (88%). Types of ground movements that exist in the research area are debris flow and earth flow. The results of the study can be used as baseline information for disaster mitigation, and regional development.