LANDSLIDE SUSCEPTIBILITY ZONATION MODEL ON JENEBERANG WATERSHED BASED ON GEOGRAPHICAL INFORMATION SYSTEM AND ANALYTICAL HIERARCHY PROCESS

摘要

The area of Jeneberang Watershed is prone to landslides due to geologic, geomorphologic and rainfall characteristics of the region. In the year 2004 the huge caldera wall collapsed in the Eastern part of the watershed area resulting in infrastructure damage, human casualties and sequencely disaster as debries flow. Potential landslides still occur in the future. It is necessary to conduct research to prepare a landslide susceptibility map of the region. The objectives of this study are as follows: firstly, to investigate the contributing parameters induceed landsliding in the Jeneberang watershed and secondly, to construct landslide susceptibility zonation map. In this study, the analytical hierarchy process (AHP) based on Geogeographical Information System (GIS) methods were used to produce map of landslide susceptibility. Data layers such as elevation, slope aspect, slope steepnes, proximity to road, proximity to river, lithology, lineaments, soil texture, rainfall, landuse or land cover and landslide inventory were extracted from various sources and used to calculate index of landslide susceptibility. The study area was classified into five hazard classification namely: very low, low moderate, high and very high. The presentage distribution of landslide degrees was calculated. It was found that about 28.40% of the study area is classified as very and high susceptibility. The results of this study is useful for preparing landslide mitigation efforts through a comprehensive planning scheme