Slope debris flows in the Wenchuan Earthquake area

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• 作者：Yanfu Li (1)
  Zhaoyin Wang (1)
  Wenjing Shi (1)
  Xuzhao Wang (2)
  
• 关键词：Slope debris flow ; rainfall intensity ; Wenchuan Earthquake ; landslide ; avalanche
• 刊名：Journal of Mountain Science
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：7
• 期：3
• 页码：226-233
• 全文大小：611KB
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• 作者单位：Yanfu Li (1)
  Zhaoyin Wang (1)
  Wenjing Shi (1)
  Xuzhao Wang (2)
  
  1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China
  2. Beijing Institute of Geology for Mineral Resources, Beijing, 100012, China
  
• ISSN：1993-0321

文摘

Avalanches and landslides, induced by the Wenchuan Earthquake on May 12, 2008, resulted in a lot of disaggregated, solid material on slopes that could be readily mobilized as source material for debris flows. Rainstorms triggered numerous slope debris flows with great damage to highways and rivers over the subsequent two years. Slope debris flows (as opposed to channelized debris flows) are defined as phenomena in which high-concentration mixtures of debris and water flow down slopes for short distances to highways and river banks. Based on field investigations and measurements of 19 slope debris flows, their main characteristics and potential mitigation strategies were studied. High rainfall intensity is the main triggering factor. Critical rainfall intensities for simultaneous occurrence of single, several and numerous slope debris flow events were 20 mm/day, 30mm/day, and 90 mm/day, respectively. Field investigations also revealed that slope debris flows consist of high concentrations of cobbles, boulders and gravel. They are two-phase debris flows. The liquid phase plays the role of lubrication instead of transporting medium. Solid particles collide with each other and consume a lot of energy. The velocities of slope debris flows are very low, and their transport distances are only several tens of meters. Slope debris flows may be controlled by construction of drainage systems and by reforestation.