基于GIS和加权信息量法的靖边县地质灾害易发性评价

Geological disaster susceptibility evaluation in Jingbian County based on GIS and weighted information value method

基于GIS和加权信息量法对靖边县开展地质灾害易发性评价,对该地区地质灾害监测预警、防护治理具有一定的指导作用。依据靖边县1∶50000地质灾害详细调查数据,选取高程、坡度、坡向、剖面曲率、水系距离、道路距离、地层岩性、归一化植被指数、地形湿度指数9个指标因子,运用层次分析法确定评价因子权重,结合加权信息量模型(WIV)对研究区进行地质灾害易发性评价。研究结果表明:①WIV模型与IV模型所得易发性分区结果均符合研究区实际情况。②地层岩性及道路水系为研究区地质灾害主要控制因素。③ROC检验结果显示WIV模型的AUC值为0.861,相较于IV模型提高了4%,表明WIV模型具有更高的可信度及评价效果。

Geological disaster susceptibility evaluation based on GIS and weighted information method has a certain guiding role for geological disaster monitoring,warning,protection and treatment in Jingbian County.According to the detailed survey data of 1∶50,000 geological disasters in Jingbian County,9 index factors including elevation,slope gradient,slope direction,profile curvature,water system distance,road distance,stratigraphic lithology,normalized vegetation index and terrain humidity index were selected,AHP was used to determine the weight of evaluation factors,and combined with weighted information model(WIV),the geological hazard susceptibility of the study area was evaluated.The results show that:①The susceptibility zoning obtained by WIV model and IV model are consistent with the actual situation in the study area.②Formation lithology and road water system are the main controlling factors of geological hazards in the study area.③ROC test results show that the AUC value of the WIV model is 0.861,which is 4%higher than that of the IV model,indicating that the WIV model has higher reliability and evaluation effect.