ABSTRACT
ABSTRACT: In South China, shallow landslides result in enormous casualties and huge economic losses in mountainous regions. The landslide hazard zonation is to offer planners with overview information of landslide prone areas which is very important in disaster mitigation since both disasters drastically increase in recently years. The slope, rock types and land use type were the main controlling factors in the shallow landslide formation process. Based on landslide formation mechanism and characteristics in small watershed region; this paper puts forward a method for landslide hazard zonation. Firstly, this paper selected the slope-unit which contains a set of ground features same in the unit and different from the adjacent units as the basic cell for landslide zonation. The partition and distinguish of slop units were made by the Digital Elevation Model (DEM) and GIS system. Secondly, the index system of hazard assessment of landslide was established by analyzing the factors that affect landslide hazard. Nine variables was imposed to create the landslide hazard risk evaluation map including topography relief, slope, slope aspect, slopeshape, soil type, thickness of weathering layer, road density, construction intensity and NDVI are chosen for landslide hazard. Finally, Landslide hazard zonation by means of GIS automatically was overlaid on the nine data layers of hazard. Through the hazard assessment model for the calculation of degree of hazard, the hazard map was deduced.
