基于GIS的澜沧江下游区滑坡灾害危险性分析  

Landslide Risk Assessment in the Lower Lancang River Watershed Using GIS Approach

作　　者：闫满存[1] 王光谦[1] 

机构地区：[1]清华大学水利系河流海洋研究所

出　　处：《地理科学》2007年第3期365-370,共6页Scientia Geographica Sinica

基　　金：云南省与清华大学合作项目"澜沧江区域综合开发协调管理的信息系统与决策支持系统建设"资助

摘　　要：澜沧江流域是中国西南地区滑坡灾害较为严重的地区。对澜沧江下游区滑坡灾害及其控制因素分析,建立基于G IS的滑坡灾害危险性评价模型,实现澜沧江下游区滑坡危险性区划,为该区滑坡灾害防治和生态环境保护等提供重要决策依据。Landslide hazards are an inherent but dangerous and costly element of mountainous environment in the lower Lancang River watershed. Conventional hazard map provide useful inventories of hazardous sites but provide little insight into the potential area of the hazards. In the paper, based on the spatial analysis of driving and triggering factors promoting the occurrence and development of landslides in the Lancang River watershed a correlation of the occurrence of landslides with slope gradient, vegetation cover and precipitation presented for providing multivariate statistical data available for assessing risk of the landslide in the area. Using ArcGIS grid module the data including contour, vegetation cover and precipitation were transformed into TIN data and DEM and further into raster gradient, vegetation and precipitation were with a raster of 100 m ×100 m. The classification of gradient, vegetation and precipitation were with five ranks, in agreement with five risk ranks of landslides of highest, high, moderate, less and none are implemented on ArcGIS platform. A risk map with the potential zones of the landslide with different risk ranks in the lower Lancang River watershed was shown. It can be sure that the highest and high risk zones are compatible to the high occurrence of landslide hazards, indicating that the index selected and methods are rational and credible. The result will be base for controlling the landslide disasters and promoting sustainable eco-environment development in the area.

关 键 词：滑坡灾害 滑坡危险性 GIS 澜沧江下游 

分 类 号：Q642.22[生物学—生物物理学]