RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (06): 996-1001.doi: 10.11870/cjlyzyyhj201606017

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CHARACTERISTIC OF DEBRIS FLOW IN HUANGDONGZI GULLY OF SICHUAN PROVINCE AFTER THE WENCHUAN EARTHQUAKE

LIU Yang, YU Bin, YI Wei, ZHU Yun-bo, LIU Qiang   

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
  • Received:2015-09-21 Revised:2015-12-11 Online:2016-06-20
  • Supported by:
    National Natural Science Foundation of China (Grant No. 41372366)

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Abstract: The 2008 Wenchuan Earthquake induced a huge scale landslide in Huangdongzi gully, part of the sliding mass accumulation in the channel, provided abundant loose materials to the later formation of debris flow, changed the debris flow formation conditions of Huangdongzi gully, and made it from a non-debris flow gully to a high frequency of debris flow gully. Gaochuan village is near the fault, and the seismic esthesia is strong. After earthquake, in every rainy season Huangdongzi gully had different scale of debris flow. On September 24, 2008, July 17, 2009, August 13, 2010, August 17, 2012, July 9, 2013, debris flow happened, and the "7.09" debris flow had the largest scale and damage. This paper focused on the analysis of the debris flow formation characteristics of Huangdongzi gully, and compared Huangdongzi gully with Wenjia gully from terrain, rainfall and geological, and finally obtained the relation of the particle diameter and the formation of debris flow. The impact of earthquake on the terrain conditions mainly included two aspects: the destruction of the slope vegetation and blocking channel to change longitudinal ratio. Huangdongzi gully and Wenjia gully are similar in terms of terrain, and are conducive to the formation of debris flow. Both Qingping town of Mianzhu City and Gaochuan village of An county are in heavy rain area, and rainfall scale in Huangdongzi gully is greater than that in Wenjia gully. The water source and water dynamic condition of Huangdongzi gully are more favorable for the formation of the large scale debris flow disaster. The landslide accumulation in Huangdongzi gully is mainly based on the large grain size, and Wenjia gully is mainly based on the small grain size. Thus, debris flow development level and scale in Huangdongzi gully is smaller than that in Wenjia gully. The results showed that particle size played an important role in the formation of debris flow, more content of coarse particle (>24cm) was not conducive to the formation of debris flow, but more fine particle (<5cm) was benefit to the formation of debris flow. Huangdongzi gully still had a lot of landslide clastic accumulation which could develop to debris flow, thus we should be vigilant in heavy rain season.

Key words: Huangdongzi gully, debris flow, particle, diameter

CLC Number: 

  • P642.23
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