RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2019, Vol. 28 >> Issue (03): 700-711.doi: 10.11870/cjlyzyyhj201903021

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Risk Assessment of Landslide in the Xiluodu Reservoir Area Based on GIS and Information Value Method

XIONG Jun-nan1,2, ZHU Ji-long1, SU Peng-cheng3, GONG Ying1, ZHAO Yun-liang1, LI Jin1, LI Wei1   

  1. (1. School of Civil Engineering and Architecture, SWPU, Chengdu 610500, China; 2. State Key Laboratory of Resources and Environmental
     Information System, Institute of Geographic and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    3. Institute of Mountain Hazards and Environment Academy of Sciences and Ministry of Water Conservancy,Chengdu 610041,China)
  • Online:2019-03-20 Published:2019-03-22

Abstract: According to the interpretation of high-resolution remote sensing images and field investigation on both sides of Jinsha River in the Xiluodu reservoir area, 161 landslides were identified. This paper started with the mechanism of landslide formation, and seven evaluation indies including elevation, height difference, slope, aspect, lithology, earthquake and rainfall were chosen to evaluate the hazard of landslides by AHP(Analytic Hierarchy Process) and information value method. The spatial distribution relationships between landslides and various factors were analyzed at first. The results showed that: (1) The landslide easily occurs in the regions with the elevation in the range of 600 - 1300 m, the height difference between 100 - 700 m, the slope between 15° - 40°, and with large rainfall. Moreover, the different slope aspects also had influence on the landslide, and there were relatively more landslides in the east, southeast and northwest direction. (2) The extremely high areas and the high risk areas accounted for 27.86% of the total study area, where 76.4% of the landslides locate, indicating that the landslides were very dense in these areas and the risk was relatively high, which was consistent with the actual situation. (3) The extremely high risk areas and the high risk areas mainly concentrate in the Xiluodu dam site along the river, which was the right bank area of the Jinsha River about 25 to 35 km away from the site of the dam, and the left bank area of the Jinsha River with 20 km away from the reservoir tail. And most of the areas in the middle section of the reservoir were moderate risk areas. (4) The correlation coefficient between the spatial distribution of landslide hazards and the risk assessment grade was 0.970 3. Verified by ROC curves, the evaluation results were ideal with the accuracy of 81.88%, which can provide theoretical supports for the disaster prevention and mitigation work in the reservoir area.

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