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

In the Three Gorges reservoir, considering damage to residents and man-made structures by natural hazards, landslide is the most important disaster in the new county seat of BaDong. For this status, landslide hazard zonation is an effective solution for land management. Firstly, based on the analysis of the landslide geological background, by reducing the material composition and historical geological environment before the occurring of landslides, nine evaluation indexes were obtained. Secondly, in order to make the evaluation units have more tangible geological significance and more consummate geologic structure, by perfecting the division method of irregular unit based on the terrain condition, the study area was divided into slope evaluation units. Finally, based on the screening of evaluation indexes by correlation analysis between the indexes and past landslide events, the weighted dynamic clustering analysis, which can consider the different contributions of different indexes to landslides, was proposed to obtain the hazard zonation of study area. The analysis show that sixteen point four percent area of the study area belongs to high risk area, and mainly distributes along the bank of Changjiang River. The hazard zonation of the new county seat of BaDong can provide useful advices for land use planning and give basis for early warning of landslide hazard.