Advances in Earth Science ›› 2012, Vol. 27 ›› Issue (6): 670-677. doi: 10.11867/j.issn.1001-8166.2012.06.0670

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A Study of Hazard Assessment of Debris Flows in Longchi Area of Dujiangyan City, Sichuan Province

Liu Qinghua, Yu Bin, Tang Chuan, Li Li   

  1. State Key Laboratory of GeoHazard Prevention and GeoEnvironment Protection, Chengdu University of Technology, Chengdu610059, China
  • Received:2011-12-20 Revised:2012-04-12 Online:2012-06-10 Published:2010-06-10

Liu Qinghua, Yu Bin, Tang Chuan, Li Li. A Study of Hazard Assessment of Debris Flows in Longchi Area of Dujiangyan City, Sichuan Province[J]. Advances in Earth Science, 2012, 27(6): 670-677.

Debris flows of Wenchuan earthquake-stricken area are more active than before earthquake. It is the primary work for the disaster prevention and mitigation of reconstruction process to assess debris flow hazard. Based on the study of scales of debris flows, areas of debris flow alluvial fans and the corresponding disaster loss, we used the average deposition thickness on alluvial fan instead of the debris flow scale, as a major factor for hazard assessment of single debris flow. The method was used to assess the hazards of 29 channelized debris flows of Longxi river basin on August 13, 2010. The results indicated that 9 debris flows were high hazard, 12 debris flows were moderate hazard and  8 debris flows were low hazard. Another method using debris flow scale as a major hazard factor was applied to assess the debris flow hazards in Longchi area. Some  65.5% of the evaluation results were unanimous in the two assessment methods. The method using average deposition thickness on alluvial fan as major hazard factor can strengthen the contribution of the scale to comprehensive  hazard degree, and can  more truly reflect the hazard level of debris flow with small drainage area and small alluvial fan at small-middle scale.

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