长江上游地区滑坡分布特征及主要控制因素探讨

在长江上游地区１００ｋｍ＾２的范围内，共普查发现滑坡１７３６处，总体积１３３．９７亿ｍ＾３，滑坡平均密度１．３７个／ｋｍ＾２，平均面变形率１３３３．０３万ｍ＾３／１０００ｋｍ＾２，其中尤以水土保持重点治理区的三大片即陇南陕南片，金沙江下游片及长江三峡库区片分布最为密集，具有规模大，活动性高，危害严重的特点，且近年来活动频率和强度有进一不加剧的趋势，在控制滑坡分布主要因素中以地形地貌，地质构造，地层

Distribution characteristics and controlling factors of landslides in the upper reaches of Yantze River

In an area of 100km2 in the upper reaches of Yangtse River (Changjiang), there are 1736 spots of landslide through surveying, with a total volume of 13. 397 billion m3, mean density of landslide of 1. 37 spots/km2,and mean areal deformability of 13330.3m3/km2. Especially, the most densley distributed areas number to three in the major water-soil conservation regions, i. e. southern Gansu-southern Shananxi, lower reaches of Jinsha River and Three-Gorge Reservoir areas, which are characterized by large scale, high activity and serious harmfulness. and in addition, with a tendency of further enhancement of the ftequency and intensity of activity in recent years. of the major controlling factors over landslides. the most important ones are landform, geologic structute, lithologic character, climate and human activity.