Landslide Hazard Zonation of the New Badong County Seat Based on GIS

摘要

Landslide disaster in the new county seat of Badong is serious in the Three Gorges reservoir area. Material composition and historical environment before the occurrence of landslides are recovered and nine evaluation indexes are selected, including lithology, water level and so on. By perfecting the division method of irregular unit, the study area is divided into slope evaluation units, which have more tangible geological significance. Each influence map layer is stacked with distribution map of slope evaluation units to obtain the calculation units and the information calculation method of slope evaluation unit is proposed. The influence zone of Yangtze River and residential area are relevant to the failure of landslide. 16.4% of the new county seat of Badong belongs to high-risk area, and 45.2% percent belongs to differential high-risk area.