基于信息量模型与层次分析法的地质灾害易发性评价——以宣汉县为例

为了全面评估宣汉县地质灾害的易发性，选取坡度、工程地质岩组、斜坡结构等7个与地质灾害密切相关的因子构建了评价指标体系。通过信息量模型结合层次分析法，利用ArcGIS的空间分析与栅格计算功能，辅以一定的数学模型，将研究区地质灾害易发性划分为高、中、低3个易发等级。其中，高易发区较为分散，面积为372.98 km2，占比为8.71%；中、低易发区面积与占比分别为2 278.18 km2、1 629.48 km2与53.22%、8.71%。通过与野外调查情况验证，认为评价结果较为合理，可为研究区的地灾防治和国土空间规划提供理论指导和技术支撑。

Evaluation of Geological Hazard Susceptibility Based on Information Model and Analytic Hierarchy Process: A case study of Xuanhan County

In order to comprehensively evaluation the susceptibility of geological hazards, Xuanhan County was selected as the research area, and seven factors closely related to geological hazards, such as slope, engineering geological petrofabric and slope structure, were selected to build an evaluation index system. Through the information model combined with analytic hierarchy process, using the spatial analysis and grid computing functions of ArcGIS, supplemented by a certain mathematical model, the geological hazard susceptibility of the study area is divided into three levels, such as high susceptibility zone, medium susceptibility zone and low susceptibility zone. Among them, the high susceptibility zones are relatively scattered, with an area of 372.98 km2, accounting for 8.71%,and the area and proportion of medium and low susceptibility zones are 2 278.18 km2, 1 629.48 km2, 53.22% and 8.71% respectively. Through the verification with the field survey, it is believed that the evaluation results of the geological hazards susceptibility are relatively reasonable, which can provide theoretical guidance and technical support for the prevention and control of geological hazards and land space planning in the study area.