基于AHP与信息量法的甘肃省滑坡易发性评估

Assessment on Landslide Susceptibility in Gansu Province Based on AHP and Information Quantity Method

甘肃省是我国滑坡灾害频发地区之一,该地居民的生命财产和生态环境遭受威胁,为降低该省受灾程度,提高人们对滑坡灾害的防范意识,对甘肃省滑坡灾害防治提供理论依据,该文参考国内外滑坡灾害风险评估指标及方法,分别从甘肃省地理环境、地质情况、人类活动等方面选取10项滑坡灾害风险影响指标,基于层次分析法与信息量模型得到的各指标权重值及信息量值,对该省滑坡易发性进行综合评估,得到结果如下:极高易发区面积占研究区总面积的4.336%,滑坡灾害密度达12.870;高易发区面积占15.243%,滑坡灾害密度达9.392;中易发区面积占47.544%,滑坡灾害密度达2.041;低易发区面积占32.875%,滑坡灾害密度为0.074;极低易发区面积占0.003%,滑坡灾害密度为0。甘肃省大部分区域滑坡易发性较小,滑坡灾害易发性空间分布呈现集中分布特征,主要集中在东南部地区,且多位于人口密度较高、交通线较密集地区。

Gansu Province is one of the areas where landslide disasters occur frequently in China,and the lives,property and ecological environment of residents in this area are threatened.In order to reduce the disaster degree of the province,improve people's awareness of landslide disaster prevention,and provide theoretical basis for landslide disaster prevention in Gansu Province,we selected ten landslide disaster risk impact indicators from the geographical environment,geological conditions,human activities and other aspects of Gansu Province,and comprehensively evaluated the landslide susceptibility of Gansu Province based on the AHP and information quantity value of each indicator obtained by using the analytic hierarchy process and information quantity model throught referring to the risk assessment indicators and methods of landslide disasters at home and abroad.The results are as follows.The area of extremely high prone area accounted for 4.336% of the total area of the study area,and the density of landslide disaster was 12.870.The area of high prone area accounted for 15.243%,and the density of landslide disaster was 9.392.The area of middle prone area was 47.544%,and the density of landslide disaster was 2.041.The area of low-prone area accounted for 32.875%,and the density of landslide disaster was 0.074.The area of extremely low prone area accounted for 0.003%,and the density of landslide disaster was 0.The landslide vulnerability is relatively small in most regions of Gansu Province,and the spatial distribution characteristics of landslide disaster vulnerability are concentrated.Landslide disaster vulnerability mainly concentrate in the southeast region,and most of landslide disaster vulnerabilities are located in the areas with high population density and dense transportation lines.