基于加权信息量模型的湖南省麻阳县地质灾害危险性评价与区划

以麻阳县1∶5万地质灾害详细调查数据为基础,选择地质灾害点密度、地形地貌、岩土体结构类型、地质构造、降雨、植被、人类工程活动、受威胁人数和潜在经济损失等9个因素作为评价指标,采用层次分析法对不同指标的重要性进行排序与赋权.最后基于加权信息量模型进行麻阳县地质灾害危险性评估及分区评价.研究结果表明:麻阳县主要处于地质灾害低-中等危险区,其中低、中危险区面积分别为984.44 km^2和414.08 km^2,极低危险区和高危险区分别为81.11 km^2和86.57 km^2.

RISK ASSESSMENT AND ZONING OF THE GEOLOGICAL HAZARDS IN MAYANG COUNTY OF HUNAN PROVINCE BASED ON WEIGHTED INFORMATION MODEL

According to the data of 1:50 000 detailed geological hazard survey in Mayang County, 9 factors including the density of geohazard sites, landform, structure type of rock-soil mass, geological structure, rainfall, vegetation, human engineering activity, threatened population and potential economic losses are selected as the evaluation indexes, and then the analytic hierarchy process (AHP) is used to rank and weight the importance of each index. Finally, the risk assessment and zoning of geohazards are carried out based on the weighted information model. The results show that Mayang County is mainly threatened by low-medium geohazards, among which the low and medium risk areas cover 984.44 km² and 414.08 km² respectively, with very low and high risk areas of 81.11 km² and 86.57 km² respectively.