基于GIS和RS的舟曲县地质灾害易发性评价  

GIS and RS-Based Evaluation of the Geological Hazard Susceptibility in Zhouqu County

作　　者：许晓霞[1,2] 张福平[1] 王有林[3] 马倩倩[1] 苏玉波[1] 

机构地区：[1]陕西师范大学旅游与环境学院,陕西西安710000 [2]甘肃省科学院地质自然灾害防治研究所,甘肃兰州730000 [3]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《甘肃科学学报》2015年第6期26-31,共6页Journal of Gansu Sciences

基　　金：中央高校基本科研业务费专项资金"干旱地区水文生态研究"(GK201101002)

摘　　要：在研究分析舟曲县地质灾害发育特点的基础上,选取植被、降水、坡度、岩土体性质、距断层距离、灾害点密度等6个评价因子建立递阶评价因子体系,采用层次分析法构建判断矩阵并求出各因子综合权重值,在GIS平台中进行运算,得到舟曲县地质灾害易发性分区图,将研究区划分为不易发区、低易发区、中易发区、高易发区。结果显示,舟曲县地质灾害高易发区主要沿白龙江分布,面积占全区的26.23%,地质灾害中易发区主要分布于北部白龙江沿岸和南部拱坝河沿岸。通过地质灾害易发性分区,可为区域地质灾害预警预报、防灾减灾提供依据,基于遥感的地质灾害易发性评价方法可为其他地区提供参考。On the basis of the research and analysis of the geohazard development characteristics in Zhouqu County, plant, rainy water, slope, features of rock and earth mass, the distance to faults and disaster density are chosen as 6 evaluation factors in the establishment of hierarchical evaluation factor system. AHP meth- od was employed to construct judgment matrix and comprehensive weight of each factor was calculated. Calculated in GIS platform,the partition map in the aspect of the geological hazards susceptibility in Zhou- qu County was realized. The investigated area is divided into non-susceptible area,low susceptibility area, medium susceptibility area and high susceptibility area. The result shows that the high disaster susceptibili- ty areas in Zhouqu County mainly distribute along Bailong River, which occupies a total proportion of 26. 23% in the whole area; and that the medium disaster susceptibility areas mainly distribute along the banks of Bailong River in the northern and Gongbei River in the southern. The partition of the geological hazards susceptible area will be a basis for geological hazards alarming, forecast, prevention and alleviation. The geological hazards susceptibility evaluation method can be a reference to other areas and regions.

关 键 词：地质灾害 易发性 层次分析 评价因子 

分 类 号：P642.2[天文地球—工程地质学]