基于加权信息量模型的多要素地质灾害易发性评价——以福州市晋安区为例

Multi-elements Geological Hazard Vulnerability Evaluation Based on Weighted Information Quantity Model--A Case Study of Jin'an District,Fuzhou City

本文对福州市晋安区的地质灾害易发性进行研究,根据研究区地质条件和地质灾害的形成机制和制灾机理,确定高程、坡度、坡向、地质构造、岩土体类型、降雨、地表水系、植被密度8个影响地质灾害易发性的环境因素。构建信息量模型计算8个因素的信息量,采用层次分析法对8个因素的信息量进行赋权,最后使用ArcGIS软件依据权重叠加指标,实现研究区易发性可视化、数据化。依据计算结果,对研究区易发性进行评价,其成果可为制定福州市晋安区的地质灾害防治方案提供依据。

This paper studies the vulnerability of geological hazards in Jin’an district,Fuzhou city.According to the geological conditions and the formation mechanism and disaster mechanism of geological hazards in the area,eight environmental factors affecting the vulnerability of geological hazards,including elevation,slope,slope direction,geological structure,geotechnical type,rainfall,surface water system and vegetation density arc determined.The information quantity model is used to calculate the information quantity of the eight factors,and the information quantity of the eight factors was assigned with weights by using the hierarchical analysis method,and finally,ArcGIS software is used to superimpose the indexes according to the weights to visualize and data the vulnerability of the study area.According to the calculation results,the vulnerabitity of the study area is evaluated,and the results can provide a basis for determining the geohazard prevention and control plan in Ji’nan district,Fuzhou city.