白龙江流域滑坡危险性评价指标体系的构建  

An Assessment Index System for Landslide Risk in Bailong River Basin

作　　者：齐识[1] 张雅莉[1] 张鹏[1] 马金珠[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,兰州730000

出　　处：《长江科学院院报》2014年第1期23-28,共6页Journal of Changjiang River Scientific Research Institute

基　　金："十一五"国家科技支撑计划项目(2011BAK12B05)

摘　　要：滑坡的发生受控于多种影响因子,同时影响因子中各属性类别对滑坡的发育分别产生促进或抑制作用,因此,构建合适的指标体系对滑坡危险性评价具有重要意义。以白龙江流域作为研究区,通过野外调查及前人研究,选取8个影响因子,并对各影响因子及其各属性类进行敏感性分析。结果表明各因子平均敏感性从大到小排序依次为:土地利用1.992,地质年代1.262,高程1.123,河流缓冲区1.059,距断层构造线距离1.058,坡度1.014,坡向0.978,NDVI(归—化植被指数)0.505,由于坡向和NDVI的平均敏感性小于1,因此予以剔除。最终确定高程、坡度、土地利用、地质年代、距断层构造线距离以及河流缓冲区6个因子作为白龙江流域滑坡危险性评价的参评因子。利用GIS的信息量法对白龙江流域滑坡进行危险性评价,得到白龙江流域滑坡危险性分区图。通过检验,评价结果具有较高的准确性,进而充分证明了参评因子选取的合理性。Landslide is influenced by multiple factors which induces or restrains the development of landslide.A proper index system for landslide risk assessment is of great significance.We take Bailong river as the research area and selected 8 factors based on field survey and previous researches.By analyzing the sensitivity of these factors and the categories in which these factors belong to,we obtained the average sensitivity of each factor in sequence：land use 1.992,strata＇ s formation age 1.262,elevation 1.123,river buffer zone 1.059,distance to the fault line 1.058,slope gradient 1.014,slope aspect 0.978,and NDVI （Normalized Difference Vegetation Index）0.505.Since the average sensitivity value of slope aspect and NDVI is less than 1,they can be ignored.The rest six factors are selected as assessment factors.Then we carried out risk assessment of landslide in the Bailong river by using GIS information method,and obtained the landslide risk zoning map.Result verification shows that the assessment is accurate,which is an evidence of the rationality of the index system.

关 键 词：滑坡 敏感性分析 GIS信息量法 危险性评价指标 

分 类 号：P642.22[天文地球—工程地质学]