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

  • 1. Institute of River and Ocean, Department of Hydrology, Tsinghua University, Beijing 100084;
    2. First Institute, Second Artillery Academy of Equipment, Beijing 100085

Received date: 2005-10-25

  Revised date: 2006-02-20

  Online published: 2007-05-20


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.

Cite this article

YAN Man-Cun, WANG Guang-Qian . Landslide Risk Assessment in the Lower Lancang River Watershed Using GIS Approach[J]. SCIENTIA GEOGRAPHICA SINICA, 2007 , 27(3) : 365 -370 . DOI: 10.13249/j.cnki.sgs.2007.03.365


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