基于GIS和信息量模型的安徽池州地质灾害易发性评价  

Susceptibility assessment of geohazards in Chizhou City of Anhui Province based on GIS and informative model

作　　者：王雷 吴君平[2] 赵冰雪 姚志强 张乐勤 WANG Lei;WU Junping;ZHAO Bingxue;YAO Zhiqiang;ZHANG Leqin(College of Geography and Planning, Chizhou University, Chizhou, Anhui 247000,China;Anhui Geological Environmental Monitoring Station, Hefei, Anhui 230000,China;School of Geographic and Oceanographic Science, Nanjing University, Nanjing, Jiangsu 210023, China)

机构地区：[1]池州学院地理与规划学院,安徽池州247000 [2]安徽省地质环境监测总站,安徽合肥230000 [3]南京大学地理与海洋科学学院,江苏南京210023

出　　处：《中国地质灾害与防治学报》2020年第3期96-103,共8页The Chinese Journal of Geological Hazard and Control

基　　金：池州学院自然科学研究项目(CZ2018ZRZ10);安徽高校自然科学研究项目(KJ2019A0866)。

摘　　要：以安徽省池州市为研究区,选取坡度、坡向、工程地质岩组、断裂、道路、河流、降雨量、土地利用类型8个影响因子进行地质灾害易发性评价。基于全市345个地质灾害点(崩塌和滑坡)样本数据,采用信息量模型对研究区各影响因子的信息量进行计算,依据灾害点密度将区域灾害易发性划分为5个等级:低易发区、较低易发区、中易发区、较高易发区和高易发区。结果表明:安徽省池州市地质灾害高易发区和较高易发区主要分布在坡度较大的山区河谷两侧,反映人类工程活动破坏、流水冲刷作用和地形地貌因素是影响该区地质灾害的主要因素。其中,高易发区和较高易发区面积为1801.47 km2,分别占全区总面积的7.89%和13.88%,高易发区和较高易发区内的灾害点分别占所有灾害点的48.7%和21.5%,其中高易发区的灾积比为6.17,明显高于其他易发等级。对地质灾害易发性的方法与技术的研究,旨在为该区的灾害防治和经济建设提供技术参考。Eight factors including slope,aspect,engineering geological group,faults,roads,rivers,rainfall and land use were chosen to evaluate the susceptibility of geohazars in Chizhou City.345 sample data of geological disaster including 146 landslides and 199 collapses were selected,the information value model was used to calculate the information value of the influence factors.According to the density of disaster points,the susceptibility of regional geohazards is divided into five grades:extremely low susceptible area,low susceptible area,middle susceptible area,high susceptible area and extremely high susceptible area.The results indicate that the extremely high risk and the high risk areas are mainly distributed on both sides of rivers and valleys in mountainous areas.It shows that human engineering activities,flow erosion and topography are the main factors affecting the geological disasters in Chizhou.The area of high-risk areas and extremely high-risk areas is 1801.47 km2,accounting for 7.89%and 13.88%of the total area respectively,and accounted for 48.7%and 21.5%of all geological disaster spots,respectively.The ratio between the extremely high risk areas and the total area is 6.17,significantly higher than other susceptibility grades.The research on the methods and techniques of geological disasters susceptibility is aimed at providing technical reference for disaster prevention and economic construction in this area.

关 键 词：地质灾害 易发性评价 GIS 信息量模型 池州 

分 类 号：P642[天文地球—工程地质学]