层次分析-熵值定权法应用于山区城镇地质灾害易发性评价

我国西南山区很多城镇面临着崩塌、滑坡等地质灾害的威胁，开展山区城镇地质灾害易发性评价研究具有重要意义。本文对重庆市武隆区羊角场镇进行了地质灾害易发性评价研究，在确定区域易发性评价因子的基础上，综合层次分析法和熵权法两种方法确定评价因子的权重，最后采用易发性指数并基于ArcGIS对研究区进行易发性评价和区划。易发性分区结果与已有的地质灾害分布有较好的对应关系。采用的组合赋权法先用层次分析法确定主观权重，然后又结合熵值法对权重进行修正，在一定程度上减少了主观影响，对地质灾害易发性的量化更加准确与合理。本文的研究思路可为山区城镇地质灾害的风险评估和防治提供参考。

Application of AHP-entropy weight method in hazards susceptibility assessment in mountain town

Many towns in the southwest China are faced with the threat of geological disasters such as collapse and landslide. Therefore, it is important to research hazards susceptibility in the mountainous towns. In this work, hazards susceptibility in Yangjiao town, Wulong district, Chongqing city is studied. The predisposing factors of geo-hazards are determined, then the weight of each assessment factor is determined by combining the AHP method and entropy weight method, and at last the susceptibility index is used in susceptibility zoning of the study area based on ArcGIS,and susceptibility zones are consistent with the geo-hazards distribution. The combination method used in this research firstly determines the subjective weight with the AHP method, and then revises the weight with the entropy method, which reduces the subjective influence to a certain extent, and quantifies the geo-hazards susceptibility more accurately and reasonably. The research ideas can provide reference for risk assessment and prevention of geological disasters in mountainous towns.