Barrier Belt Division Based on RS and GIS in the Three Gorges Reservoir Area ——A Case of Wanzhou District

The Three Gorges Reservoir project is a famous project in the world for the profound and long-term effect. Barrier belts of the Three Gorges Reservoir were concerned by China and all worlds, for causing water loss and soil erosion, geologic hazards and environmental pollution. In this paper, taking Wanzhou district as study area, the division methods of barrier belts of The Gorges Reservoir Area were discussed. Appling Remote Sensing (RS) and Digital Elevation Model (DEM) data, the mutation lines of surface brightness temperature and surface humidity were obtained through analyzing the annual change from 1995 to 2008. Based on Geographic Information System (GIS) technology, ridge Line were extracted form DEM data. Under the principle of max scope, the ranges of barrier belts were divided. The results indicate that the influence distance of temperature and humidity change is only 35Km, for raise of the Three Gorges Reservoir. And the area of barrier belts is 2215 Km2, 64.2% of Wanzhou district. The results provide references for the Three Gorges Reservoir Area integrated studies.