陕西凤县地质灾害易发性评价研究  

GIS Based Four Zones of GEOHAZARD SUSCEPTIBILITY Degrees for FENGXIAN COUNTY in Qinling Mountains of SHAANXI PROVINCE

作　　者：孟庆华[1] 孙炜锋[1] 王涛[1] 

机构地区：[1]国土资源部新构造运动与地质灾害重点实验室中国地质科学院地质力学研究所,北京100081

出　　处：《工程地质学报》2011年第3期388-396,共9页Journal of Engineering Geology

基　　金：国家"十一五"科技支撑课题(2006BAC04B05);中国地质调查局项目(1212010640401)资助

摘　　要：区域地质灾害易发性评价是地质灾害早期预警的基础。为了探索秦岭山区区域地质灾害易发性评价方法,文中在陕西凤县1:5万地质灾害详细调查和数据库建设的基础上,详细分析了地质灾害的发育分布规律及影响因素,利用G IS技术结合信息量模型方法完成了凤县地质灾害的易发性评价区划。结果显示:凤县地质灾害分布主要与河流侵蚀、植被覆盖率及人类工程活动相关。根据评价结果将凤县地质灾害易发性划分为4个等级,其中,地质灾害高易发区面积190.3km2,占全县总面积的6.0%;中易发区面积642.0km2,占20.1%;低易发区面积1314.5km2,占41.2%;基本安全区面积1040.1km2,占32.6%。评价结果可为凤县土地利用规划和地质灾害防治规划提供依据,并可为秦岭山区城镇地质灾害易发性评价提供思路和方法。Regional geo-hazard susceptibility assessment is the basis for early warning of geo-hazards.To develop assessment methods of geo-hazard susceptibility in Qinling Mountain area,the distribution and the main influencing factors of geo-hazards in Fengxian county,Shaanxi province are comprehensively analyzed based on the geo-hazard investigation and mapping of 1： 50000 scale.With GIS and information model,the geo-hazard susceptibility evaluation of the whole area of Fengxian County is carried out.According to the result,the distribution of geo-hazard is mainly affected by river erosion,vegetation coverage and human activities.The whole area can be divided into four categories： the high grade area,which covers 190.3km2,accounting for 6.0% of the total study area;the medium grade area,which covers 642.0km2,accounting for 20.1%;the low grade area,which is measured 1314.5km2,taking up for 41.2%;and the stable area that is measured 1040.1km2,taking up for 32.6%.The results can provide a basis for construction layout and geo-hazard prevention and reduction in Fengxian County and also provide the guideline for geo-hazard susceptibility zonation in other counties of Qinling Mountain area.

关 键 词：凤县 地质灾害 易发性GIS技术 信息量模型 

分 类 号：P642[天文地球—工程地质学]