基于ArcGIS的四川松新黑水河地区滑坡危险性评价

以松新黑水河地区作为研究区域,基于遥感解译、野外调查统计、地质环境分析、典型滑坡研究的基础上,选取坡度、工程地质岩组、斜坡结构、断裂构造、降雨、人类工程活动等6个与滑坡发生相关的要素作为危险性评价因子。在ArcGIS空间分析模块中,采用自然断点法的数据分类方法,运用频率比——面域模型,对研究区滑坡危险性进行了评价与区划。研究结果表明:松新黑水河地区滑坡危险性分区为:高危险区、中等危险区、低危险区3个区域,所占研究区面积比例分别为32%、50%、18%。

Risk assessment of landslide based on ArcGIS approach and zoning along Heishui river in Songxin town, Sichuan

Taking Heishui river in Songxin town, Sichuan Province as a case study of risk assessment of landslide hazard on the basis of remote sensing interpretation, field investigation and statistics, analysis of geological environment and typical landslides study, the 8 components of slope, engineering geological lithology, slope texture, fault, rainfall and human engineering activities were selected as factors for risk assessment of landslide hazard. Landslide hazard in study area was assessed by frequency model and classified using natural breakpoint method in GIS platform. The zoning map of landslide hazard was achieved finally. Based on the zoning map of landslide hazard, the study area could be divided into three risk areas, i.e.,high-level dangous zone (accounting for 32% of the whole area), medium-level dangous zone (accounting for 50% of the whole area), and low-level dangous zone (accounting for 18% of the whole area) respectively.