基于信息量模型的玉树地震次生地质灾害危险性评价  

Susceptibility Assessment of Secondary Geological Disaster Based on Information Value Methodology for Yushu Earthquake Region

作　　者：牛全福[1,2,3] 程维明[2] 兰恒星[2] 刘勇[1] 颉耀文[1] 

机构地区：[1]兰州大学资源环境学院,甘肃兰州730020 [2]中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京100101 [3]甘肃省电力设计院,甘肃兰州730050

出　　处：《山地学报》2011年第2期243-249,共7页Mountain Research

基　　金：863专题(2009AA12Z103-3);国家自然科学面上基金项目(40871177);国家科技支撑计划(2008BAK50B01-5和2008BAK50B01-6)共同资助~~

摘　　要：2010-04-14发生在青海省玉树的Ms7.1级地震引发了大量的地质灾害。基于GIS技术和信息量模型方法,以坡度、坡向、高程、坡形、地貌类型、断层距和地层岩性为评价因子,通过空间分析计算各因子的信息量,分析地质灾害在各因子中的空间分布特征,对各评价因子图层进行空间建模,将获取的信息量图划分为高度、中度、轻度三级危险区,通过遥感解译研究区实际滑坡分布,与危险性分布图叠加表明:本次研究得出的危险等级与实际的滑坡发生情况相吻合,为灾区重建提供参考依据。Yushu Ms7.1 earthquake,occurred on 14 April 2010 in Qinghai province induced a kind of secondary geological disasters.Based on GIS and information value methodology,taking the factors including slope,aspect,altitude,morphology,slope characteristics,geomorphologic types,fault and lithology as assessment factors,information value of secondary geological disasters in different assessment factors was calculated by means of ArcGIS.Then the spatial distribution of secondary geological disasters in each of assessment factors was discussed.Space model for each map layer of assessment factors was performed.Information value map was calculated and categorized into three classes,specifically,＂low＂,＂moderate＂,＂high＂.According to the disasters acquired from remote sensing overlayed on the Information value map,the result can be summarized as follows.The hazard classes calculated by GIS and information value methodology preferably inosculate with field surveying.The result of this paper can provide the valid basis for the reconstruction of Yushu earthquake area in future.

关 键 词：地质灾害 信息量模型 评价因子 危险性评价 

分 类 号：P642.2[天文地球—工程地质学] X141[天文地球—地质矿产勘探]