关键词: GIS, 三峡库区, 滑坡因子, 统计分析

Abstract: Geographical Information System(GIS)has been widely used in the field of landslide studies because of its powerful spatial analysis and spatial database management. The authors review statistical relationship between landslide occurrence and static and dynamic variables using powerful function of GIS. To apply the statistical method, a spatial database with consideration of static factors was designed and constructed. These data are available either as a paper map or as a digital map. A digitized map of landslide location and boundaries was produced from the catalogue about regional landslides and 1:10 000 distribution maps; topographical and geological data (1:10 000scale paper maps) are collected, digitized and manipulated into a spatial database using ArcGis GIS. We used 7 landslide triggering factors to analyze the relation landslide spatial distribution and their contributing factors. The influence of pertinent factors on the occurrence of landslides is Q\-4、J\-\{1x\}、J\-\{1z\}、S Lithology formation; 90m, 90～135 m and 135～175 m elevations; 15～20 m local relief; 10°～15°、15°～20° and 20°～25° slope; N,S and WN aspect and 1～1 curvature. The GIS was used to analyze efficiently the vast amount of data, and statistical programs were used to maintain specificity and accuracy. The results can be used to reduce associated hazards, and to plan land use and construction.

Key words: GIS, Three Gorges Reservoir Area, landslide causative factor, statistical analysis