基于GIS分析的泰安市地质灾害风险评价

Risk Assessment of Geological Disasters Based on GIS Analysis in Tai'an City

泰安市地处鲁中山区,山地丘陵广泛分布,崩塌、滑坡、泥石流和岩溶塌陷等地质灾害较为发育。本次研究依托新一轮1∶5万地质灾害风险普查,基于ArcGIS平台空间分析功能对高精度DEM、构造、工程地质和水文地质、降雨及植被等数据分析和提取,利用信息量法和层次分析法分别对崩滑泥石流和岩溶塌陷易发性评价,以降雨作为危险性评价因子,综合考虑人口和经济因素选择用地类型作为易损性条件进行风险区划,最终划分为地质灾害风险高、中、低3个等级,为今后有效开展自然灾害综合防治、衔接国土空间规划和保障经济社会可持续发展提供基础依据。

Tai'an city is located in the central mountainous area in Shandong province.Mountains and hills are widely distributed,and geological disasters,such as landslide,debris flow and karst collapse are well developed.In the past,many rounds of geological disaster investigation and verification have been carried out in Tai'an city.In this study,based on a new round of geological disaster risk survey with the scale of 1∶50000,analysis and extraction of high precision DEM,structure,engineering geology,and hydrogeology,rainfall and vegetation data based on spatial analysis function of ArcGIS platform,evaluation of susceptibility of debris flow and karst collapse by information method and hierarchical analysis,taking rainfall as a risk assessment factor,considering the population and economic selection of land types as vulnerability factors for risk regionalization,geological disaster risks are divided into high level,medium level and low level.It will provide a basis for effective prevention and control of natural disasters,territorial spatial planning and sustainable economic and social development.