河南省嵩县地质灾害风险评价

Risk assessment of geological hazards in Song County,Henan Province

基于ArcGIS环境下,通过选取河南省嵩县区域高程、地貌、工程岩组、植被覆盖度、距构造距离、距水系距离、坡度、坡向等8个因子建立危险性评价模型,易损性选取建筑物、人员和交通等3个承灾因子,分别采用信息量模型和层次分析法对河南省嵩县区域进行地质灾害易发性、危险性和易损性评价。研究结果表明,嵩县区域划分为低风险区面积为965.34 km^(2),占嵩县区域面积32%;中风险区面积为1114.65 km^(2),占嵩县区域面积的37%;高风险区面积为826.23 km^(2),占嵩县区域面积的27%;极高风险区面积为102.68 km^(2),占嵩县区域面积的3%。研究成果可应用于嵩县防灾减灾及地质灾害风险管控等方面。

Using the ArcGIS environment,a risk assessment model is established by selecting eight indicator factors,including regional elevation,landform,engineering rock group,vegetation coverage,distance from structures,distance from water systems,slope,and slope direction in Song county,Henan Province,China.The vulnerability is evaluated under three disasterbearing factors:buildings,personnel and traffic.The information volume model and analytic hierarchy process are used to assess the susceptibility,risk and vulnerability of geological disasters in Song county.The results show that the area of Song county is divided into low-risk areas,covering 965.34 km^(2),accounting for 32% of the total area;medium risk area,covering 1114.65 km^(2),accounting for 37% of the total area;high-risk area,covering 826.23 km^(2),accounting for 27% of the total area;and extremely high risk area,covering 102.68 km^(2),accounting for 3% of the area.These research findings can be widely applied to disaster prevention,mitigation,and geological disaster risk control in Song county.