基于改进统计分析法的地质灾害危险性评价研究

Study on risk assessment of geological hazards based on improved statistical analysis

为了对某地区地质灾害危险性进行评价,基于改进统计分析法研究了该地区的地质灾害危险性。介绍、分析了改进统计分析法,选取地形地貌、工程地质岩组、断裂构造、植被覆盖指数、灾害点密度、河流水系、道路影响距离、多年平均降雨量等8大类74个亚类作为评价因子,并根据各因子图层面分类并赋值,采用空间分析功能和GIS的叠加对各栅格单元进行综合信息量计算,从而得出研究区的灾害险性划分。该研究为相似地区地质灾害危险性区划具有一定的借鉴意义。

In order to evaluate the risk of geological disasters in a given area,with the improved statistical analysis method,the authors studied the geological hazard of the region. Seventy-four sub-classes of eight major categories, including topography, engineering geological rock formation, fault structure, vegetation coverage index, disaster point density, river system, road impact distance and average annual rainfall, were selected as evaluation factors. Then these factors are classified and assigned according to each factor graph level. According to the factor level classification and assignment, based on the spatial analysis function and the overlay of GIS, the comprehensive information of each grid unit is calculated, and the disaster risk division of the study area is obtained. The study can be useful for reference in geological hazard regionalization in similar areas.