基于GIS的广西北流市地质灾害易发性分区评价

以北流市为例,利用地质环境要素对地质灾害易发性进行评价,并通过MapGIS软件实现可视化。选取了地质灾害发育密度、地貌类型、自然斜坡坡度、工程地质岩组、残坡积土层厚度、人类活动强度、多年平均降雨量7个影响地质灾害易发性的地质环境因素,建立了地质灾害易发性评价指标体系和评价方法,并对研究区进行了评价,依据预测分区指标计算,研究区地质灾害高易发区总面积为1185. 37 km~2,占全市总面积的49%;地质灾害中易发区总面积为1027. 76 km~2,占全市总面积的41%地质灾害低易发区总面积为243. 50 km~2,占全市总面积的10%。

Evaluation of geological hazard prone zone based on GIS in Beiliu City,Guangxi

Taking Beiliu City as an example, this paper evaluates the vulnerability of geological hazards by using geological environment elements, and realizes visualization by MapGIS software.Selected the geological disaster development density, landform type, slope, engineering geological petrofabric, the natural slope residual diluvial soil thickness and intensity of human activities, seven years of average rainfall influence of geological hazards in geological environment factors, established the evaluation index system of geological hazards in sex and evaluation method, and the study area is evaluated, based on partitioning index calculation, high prone to geological disasters in the study area with a total area of 1185.37 km², accounting for 49% of the total.The total area of the areas prone to geological disasters is 1027.76 km², accounting for 41% of the total area of the city. The total area of the areas prone to geological disasters is 243.50 km², accounting for 10% of the total area of the city.