基于信息量法的重庆云阳县(三峡库区)地质灾害易发性评价

云阳县地处重庆市东部,属三峡库区,构造上位于川东弧形构造带东北段,褶皱形态以宽平的屉形向斜和狭窄的高背斜相间排列,组成隔挡式构造。区内地貌以中-高山峡谷地貌为主,第四纪以来一直处于间歇性抬升状态,地形切割强烈,长江河道从境内穿过,河流水系发育,年降雨量大,地质环境条件脆弱,地质灾害发育。论文基于Arcgis平台,运用信息量法全面分析了影响云阳县地质灾害发育的地形条件、地层岩性、地质构造、河流水系、人类工程活动等因素,建立了云阳县地质灾害易发评价指标体系。评价结果表明,高易发区面积576 km^2,占比15.8%,中易发区面积1801.68 km^2,占比49.41%;评价结果可为云阳县区域地质灾害防治提供依据,也可为三峡库区地质灾害易发性评价提供参考。

Geological hazard susceptibility assessment based on weighted information value in Yunyang County (The Three Gorges Reservoir Area), Chongqing

Based on GIS and weighted information value, this paper establishes the evaluation index system of Yunyang County''s susceptibility to geological disasters by comprehensively analyzing the topographic conditions, formation lithology, geological structure, river system, human engineering activities and other factors that affect the development of geological disasters. The evaluation results show that the area of high vulnerable areas is 576 km², accounting for 15.8%, while the area of middle vulnerable areas is 1801.68 km², accounting for 49.41%. The evaluation results can provide a basis for the prevention and control of geological disasters in yunyang county and a reference for the evaluation of the vulnerability of geological disasters in the three gorges reservoir area.