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Rainfall-triggered debris flows following the Wenchuan earthquake

  • C. TangEmail author
  • J. Zhu
  • W. L. Li
  • J. T. Liang
Original Paper

Abstract

On 24 September 2008, 72 debris flows were triggered by heavy rainfall in the central part of the area affected by the Wenchuan Earthquake. This paper describes the process of debris-flow initiation and transport in the study areas and presents field observations on the roles of rainfall, lithology and the presence of faults. It is likely that following the ground shaking, the critical amount of accumulated precipitation and the hourly rainfall intensity necessary to initiate debris flow was reduced compared with values before the earthquake. A case study in the Xishanpo gully is presented; the debris flow from which caused a thick accumulation in the already devastated city of Beichuan. It is concluded that the whole of the area shaken by the Wenchuan Earthquake is now more susceptible to debris flows, which may be initiated by localized heavy rainfall. Care must be taken to properly assess this new type of geo-hazard.

Keywords

Debris flows Intensive rainfall Accumulated precipitation Lithology Wenchuan earthquake Rainfall conditions Seismic landslides 

Notes

Acknowledgments

Funding was provided by 973 Program (2008CB425801) and the National Foundation for Natural Science of China (40772206). We thank Niek Rengers for his comments and suggestions on earlier versions of the manuscript.

References

  1. Benda L (1990) The influence of debris flows on channel sand valley floors in the Oregon Coast Range, U.S.A. Earth Surf Proc Land 15:457–466CrossRefGoogle Scholar
  2. Chen CY (2009) Sedimentary impacts from landslides in the Tachia River Basin. Geomorphology 105:355–365CrossRefGoogle Scholar
  3. Chen H, Hawkins AB (2009) Relationship between earthquake disturbance, tropical rainstorms and debris movement: an overview from Taiwan. Bull Eng Geol Environ (this issue), doi: 10.1007/s10064-009-0209-y
  4. Coe JA, Glancy PA, Whitney JW (1997) Volumetric analysis and hydrologic characterization of a modern debris flow near Yucca Mountain Nevada. Geomorphology 20:11–28Google Scholar
  5. Costa JE, Wieczorek GF (eds) (1987) Debris flows/avalanches: process, recognition, and mitigation. Geol Soc Am Eng Geol, vol 7. Boulder, p 239Google Scholar
  6. Eaton SL, Morgan MA, Kochel RC, Howard AD (2003) Role of debris flows in long-term landscape denudation in the central Appalachians of Virginia. Geology 31:339–342CrossRefGoogle Scholar
  7. Godt JW, Coe JA (2007) Alpine debris flows triggered by a 28 July 1999 thunderstorm in the central Front Range, Colorado. Geomorphology 84:80–97CrossRefGoogle Scholar
  8. Griffiths PG, Webb RH, Melis TS (2004) Frequency and initiation of debris flows in Grand Canyon, Arizona. J Geophys Res 109:321–336CrossRefGoogle Scholar
  9. Iverson RM (1997) The physics of debris flows. Rev Geophys 35(3):245–296CrossRefGoogle Scholar
  10. Lin CW et al (2003) Impact of Chi-Chi earthquake on the occurrence of landslides and debris flows: example from the Chenyulan River watershed, Nantou, Taiwan. Eng Geol 71:49–61CrossRefGoogle Scholar
  11. Varnes DJ (1978) Slope movement types and processes. In: Schuster RL, Krizek RJ (eds) Landslides: analysis and control. National Academy of Sciences, Transportation Research Board, Washington, DC, pp 11–33Google Scholar
  12. Webb RH, Pringle PT, Reneau SL, Rink GR (1988) Monument Creek debris flow, 1984: implications for formation of rapids on the Colorado River in Grand Canyon National Park. Geology 16:50–54CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.State Key Laboratory of Geo-Hazard Prevention and Geo-Environment ProtectionChengdu University of TechnologyChengduChina

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