汤口断裂带沿线地质灾害频发,为研究该断裂对周边地区地质灾害的影响程度,以断裂带南段的地质灾害隐患点为研究对象,选取研究区内的坡度、工程地质岩组和断裂距离等7个指标建立评价体系,运用层次分析法和信息量模型法开展地质灾害易发性评价.计算结果显示,断裂构造的影响因子占比较大(信息量值为2.729),叠加层次分析法后的评价分区图进一步表明,地质灾害易发区主要集中在汤口断裂带附近.结合受试者工作特征(receiver operating characteristic curve,ROC)曲线的精度结果对比,两方法耦合评价模型曲线下面积(area under curve,AUC)明显优于单一信息量模型,且与研究区地质灾害调查结果一致,说明汤口断裂对研究区地质灾害存在较大影响.
Geological Hazard Vulnerability Assessment in Southern Part of Tangkou Fault Based on GIS and Weighted Information Value Model
Geological disasters occur along the Tangkou Fracture Zone frequently.To study the influence of this fracture on geological disasters in the surrounding areas,the geological disaster sites in the southern section of the fracture zone were taken as the research object,and seven indexes,including slope,engineering geological rock group,and distance from the fracture,etc.,were selected to establish an evaluation system.Then,the evaluation of the susceptibility to geologic hazards was carried out by using the hierarchical analysis method and the informativeness modeling method.The results show that the influence factors of the fracture structure account for a large proportion(the informativeness value is 2.729),and the evaluation zoning map after superimposing the hierarchical analysis method further shows that the geohazard-prone areas are mainly concentrated near the Tangkou Fracture Zone.The accuracy of the combined ROC(receiver operating characteristic curve)curve shows that the two-method coupled evaluation model(area under curve,AUC)is significantly better than the single-informative model,which is consistent with the results of the geohazard investigation in the study area.Therefore,this study indicates that the Tangkou Fracture has a greater influence on the geohazards in the study area.
the Tangkou Fault Zonegeological hazardsusceptibility evalutionanalytic hierarchy processinformation value model
万方数据
维普
