基于信息量模型的达曲库区滑坡危险性分析

选取南水北调西线一期工程四川甘孜州达曲库区作为研究区域,根据库区内已有滑坡的形成原因,选择坡度、高程、地层、距水系距离和距断层距离等5个影响因素,利用基于G IS的信息量模型,实现了达曲库区滑坡灾害危险性区划。其中,高危险区面积4.02 km2,占0.90%;中危险区面积30.40 km2,占6.79%;低危险区面积126.46 km2,占28.23%;稳定区面积287.04 km2,占64.08%。经过与实际情况对比分析,区划结果可以作为达曲库区滑坡灾害治理的参考依据。

Analysis on Landslide Hazard Risk in Daqu Reservoir Area Based on Information Value Model

Selecting Daqu reservoir area in Ganzi county of Sichuan, the first phase project of the west route of the South-to-North Water Transfer Project, as a study area, landslide risk zoning is made in Daqu reservoir area by use of information value model based on GIS, according to the available information concerning causes of landslides in this area and 5 affecting factors as slope gradient, elevation, stratum, distance to rivers and distance to faults. The study area is divided into four classes, 4. 02 km~2 as high-risk area accounting for 0. 90% , 30. 40 km~2 as mid-risk area accounting for 6. 79% , 126. 46 km~2 as low-risk area accounting for 28. 23% and 287.04 km~2 as safe area accounting for 64.08%. In contrast with actual situation, the result can be used as referential basis for landslide control in Daqu reservoir area.