基于贡献率模型与GIS的滑坡地质灾害风险评价——以沐川县为例  

Regional Landslide Risk Assessment of Muchuan County as s Case Based on Contributing Weight Model and GIS

作　　者：周光红[1] 裴勇军 吴彩燕[3] 

机构地区：[1]成都理工大学核技术与自动化工程学院 [2]衢州市测绘院 [3]西南科技大学环境与资源学院

出　　处：《金属矿山》2013年第11期130-134,共5页Metal Mine

基　　金：科技部国际合作项目(编号:11zh0021)

摘　　要：以沐川县滑坡灾害风险性评价为例,选取沐川县地层岩性、高程、地形起伏度、坡向因子、剖面曲率、平面曲率6个因子作为危险性评价因子,人口密度、林地密度、耕地密度、滑坡灾害密度4个指标作为易损性评价因子,利用贡献率模型求出区域滑坡灾害的易损性与危险性,在GIS中对2因子进行叠加运算得到区域滑坡的风险区划图。结果表明,沐川县极高风险区主要出现在海云乡内,较高风险性区主要出现在武圣乡境内,高风险性区分布在黄丹镇、箭板镇、建和乡以及永福镇。Taking the landslide disaster risk assessment in Muehuan county as an example, six factors of formation li- thology, elevation, topographic relief, exposure factor, profile curvature, plane curvature were selected as the landslide disas- ter hazard assessment factors, and four factors of population density, forest density, cultivated density, landslide disaster den- sity were selected as the landslide disaster vulnerability assessment factors. The contributing weight model was used to ob- tain the self-weight and inter-weight of assessment factors after dealing with the transformation of contribution rate and weight, and then multiplied with the two weights and index value to get the vulnerability and risk of regional geological disas- ters. The geological disaster risk zoning can be obtained by multiplying the results of vulnerability and risk. The conclusion is that it is feasible to build the disaster risk assessment model with the contributing weight model. The extremely highest geological disaster risks zone is less, which is mainly distributed in the territory of Haiyun town. The higher disaster zone is mainly distributed in the territory of Wusheng town. The high disaster zone is mainly distributed in the territory of Huangdan town,Jianban town, Jianhe town and Yongfu town.

关 键 词：滑坡 贡献率模型 地质灾害 风险性评价 

分 类 号：P642.22[天文地球—工程地质学]