基于GIS的地质灾害易发区划分与评价研究

分析了地质灾害形成条件、诱发因素,将灾点分布密度、斜坡坡度、斜坡坡型、斜坡坡高、河流冲刷、岩土体条件、人类活动等七个因素作为地质灾害易发程度评价指标,利用层次分析法计算出各评价因子的权重。基于GIS将评价因子进行量化,得到了各评价指标归一化图,根据各评价指标的权重,利用空间叠置分析功能将所有评价指标进行叠加分析计算,得到地质灾害高易发区、中易发区、低易发区和不易发区的分级结果。分级结果极大地方便了地方政府相关部门防灾减灾工作,为地质灾害防治提供了决策依据。

Study on the Evaluation of Susceptibility of Geological Hazards Based on GIS

Seven factors,such as the disaster points distribution density,slope gradient,slope type,slope high,rivers,and geotechnical engineering conditions,human activities are used to evaluate the degree of geological disaster susceptibility and to calculate the weight of each evaluation factor by analytic hierarchy process.Based on GIS,the evaluation factor are quantified,and the normalized graph are obtained.According to the weight of each evaluation index,the superposition analysis of all the evaluation indexes is carried out by using the spatial superposition analysis function,get high-hazard area,low-prone areas and prone areas of grading results.Classification results greatly facilitate the local government departments related to disaster prevention and mitigation work and control of geological disasters.