Abstract:
Abstract：Landslides will pose a great threat to people’s lives, property, as well as social and economic development.Taking Dechang County in Liangshan Prefecture with dense landslide hazards as an example, the essay analyzes the landslide development environment and distribution characteristics in the region.In this connection, 9 types of influencing factors are selected and information value model is employed to conduct hazard assessment of the landslide in the region.On this basis, the research area is divided into 5 levels from high to low: extremely high, high, moderate, mild and extremely mild.And conclusions are as follows: (1) Areas with high hazard of landslide are mainly distributed in places with slopes of 8° to 25°, elevations of 50 to 100 m, and places with magmatic, metamorphic and clastic rocks.Faults, river systems, road construction and human activities, to a large extent, will lead to landslides, the probability of which will increase along with the precipitation; (2) Landslides mainly occur by and around the river banks, and 93.95% of the landslides are distributed in regions of moderate and over-moderate areas; regions of extremely high and high are mainly concentrated in the Anning River Basin, the Zida River Basin and the middle and high mountain valleys on the left bank of the Yalong River.As for the east part of the county, the landslide hazards is less dangerous and less affected by; (3) The AUC value is 0.843 by using ROC curve, which indicates that the evaluation result is reliable.The research results will help to provide Dechang County with theoretical support for the disaster prevention and mitigation and subsequent planning work.