基于Arcgis的地质灾害易发性和危险性分区评价——以宿松县为例

在了解地质环境和灾害特征的基础上,依据综合指数法,确定因子权重,通过Arcgis空间分析软件,作出宿松县斜坡单元网格并进行相应的模拟运算,得出每一个评价单元内所有影响因子的加权和。最后,依据分区标准对易发程度指数图层进行插值处理,便得到宿松县地质灾害的易发性分区。将区域的受威胁对象和易发性叠加计算,将得出各个区域的危险性等级,最后结合地质灾害易发性分区得出危险性分区。分区结果反应出野外调查实际情况。

ASSESSMENT OF THE SUSCEPTIBLE DEGREE AND DEGREE OF RISK OF GEOLOGICAL HAZARD BASED ON ARCGIS---A CASE OF SUSONG

The Synthetical Index Method was used to determine factor weights, based on the geological environment.Through Arcgis spatial analysis software,the weighted sums of all impact factor in each evaluation unit was obtained by dividing into ramp element mesh and making analog calculation.Finally,it needs interpolation processing of prone degree index layer,according to the zoning standards,then obtains susceptibility zonation of Geo-logical Hazards in Susong County.Risk grades were obtained by the vulnerability of the ob-j ects and susceptibility.The zoning results conform to the field surveys.