RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (11): 1984-1992.doi: 10.11870/cjlyzyyhj201511024

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SENSITIVITY ANALYSIS OF DEBRIS FLOW ALONG HIGHWAY BASED ON GEOMORPHIC EVOLUTION THEORY

XIANG Ling-zhi1, LI Yong2, CHEN Hong-kai1, SU Feng-huan2, HUANG Xiao3   

  1. 1. Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
    2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chinese Academy Sciences Key Lab. of Mountain Hazards and Surface Processes, Chengdu 610041, China;
    3. Hui Hua College of Hebei Normal University, Shijiazhuang 050091, China
  • Received:2015-01-05 Revised:2015-03-30 Online:2015-11-20

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Abstract: Debris flow is one of common disasters in the mountain aera, especially after the richer scale 8.0 earthquake in Wenchuan on 12 May 2008, in Sichuan Provence. A large quantityof loose materials which are caused by earthquake in vally are provided for debris flow. Expiated by heavy rainfall, regional group debirs flow hazards occurs, and causes serious property loses and threatens people's life. So the prediction of debris flow is urgent task now. But the formation of debris flow is so complicated that can't be predicted accurately. Some researchers consider small valley is the most active agent in landscape evolution, and debris flow in it takes the most energetic role in mass transportation. According to A.N.Stranler'S geomorphologic erosion circulation theory, the parameter of a drainage basin's hypsometric integral(S) is used for describing basin geomorphology. Lately the hypsometric integral has become an index to infer activities of disaster in some ravine, and is used to find the source region of debris flow. The paper, based on the theory of debris flow was derived from certain branch watershed which in special evolution stage, the relationship of hypsometric curve and the debris flow activities was anglicized. For the curve, integral value(S) of hypsometric integral curve was characterization of the solid material reserves for debris flow in the ravin. The larger parameter S is the indication of younger geomorphology stage of the ravine, and more rock,soil or other materials can be provided for debris flow. And parameter K which is the elevation ratio corresponding S/2 was characterization of elevation position of the debris flow source area initially. The larger parameter K is the indication of the higher elevation of the cathment area, and also better condition for the water gather for debris flow. As to sensitivity analysis for debris flow along highway in wenchuan county which has been seriously damaged in the earthquake, With the support of spatial analysis function of Arcgis and the matlab software, 1:50 000 terrain data before the earthquake in 2008 is used to calculate the parameter S and K for each debris flow ravine. The results showed landscape development stage of the basin and the elevation of catchment area. According to the actual disaster activity after earthquake, the hypsometric integral value of sub level basin debris flow gully with the features of S below 0.5 but frequent outbreaking, or large area and more branches was calculated. The results were used to discriminate the specific source for the debris flow. And according to S, the debris flow sensitivity were graded determined in the end. Then the potential influence of geomorphic evolution to debris flow activity was explained the results.

Key words: geomorphologic evolution, debris flow, sensitivity, Wenchuan County, earthquake

CLC Number: 

  • P642.23
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