• ISSN 0258-2724
  • CN 51-1277/U
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Volume 29 Issue 5
Oct.  2016
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Journal of Southwest Jiaotong University  > 2016  >  29(5): 1014-1023.
ZHANG Yongshuang, YAO Xin, GUO Changbao, LI Lingjing, YANG Zhihua, DU Guoliang. Regional Warning of Debris Flow Hazards after Wenchuan Earthquake in Longmenshan Region[J]. Journal of Southwest Jiaotong University, 2016, 29(5): 1014-1023. doi: 10.3969/j.issn.0258-2724.2016.05.026
Citation: ZHANG Yongshuang, YAO Xin, GUO Changbao, LI Lingjing, YANG Zhihua, DU Guoliang. Regional Warning of Debris Flow Hazards after Wenchuan Earthquake in Longmenshan Region[J]. Journal of Southwest Jiaotong University, 2016, 29(5): 1014-1023. doi: 10.3969/j.issn.0258-2724.2016.05.026
shu

Regional Warning of Debris Flow Hazards after Wenchuan Earthquake in Longmenshan Region

doi: 10.3969/j.issn.0258-2724.2016.05.026
  • Received Date: 14 Jul 2016
  • Publish Date: 25 Oct 2016
    Abstract
  • Massive loose deposits caused by the Wenchuan earthquake on May 12, 2008 have resulted in significant decrease of rainfall threshold of post-earthquake triggering debris flow in comparison with pre-earthquake level. Based on the post-earthquake debris flow characteristics analysis in the Longmenshan region, the regional rainfall threshold of triggering debris flow and its regional differences were discussed. The 72-hour rainfall distribution characteristics of post-earthquake triggering debris flows are as follows: 75-100 mm in YingxiuWenchuan area, 100-160 mm in MaoxianBeichuan area, 160-200 mm in around above regions and PingwuQingchuan area, and 200 mm or more in YanmenChaba area and YuliPingwu area. Based on comprehensive analysis of seismogeology, topographic and geomorphic conditions, extreme rainfall and regional characteristics of post-earthquake debris flows, the regional rainfall threshold of triggering debris flow, as well as the warning index system, for earthquake-stroked region was established. The weighted information model was adopted to complete debris flow susceptibility assessment in the earthquake-stroked Longmenshan region. Then, taking the annual maximum 72-hour rainfall as a main trigger factor, the debris flow hazard assessment and regional warning study in 5 years after the Wenchuan earthquake were conducted. The results show that the regional debris flow hazard is dynamic, and the areas with high debris flow hazard change with the spatial distribution of rainfall and loose deposits.

     

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