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Landslides

, Volume 12, Issue 6, pp 1139–1145 | Cite as

Sensitivity of the initiation of debris flow to initial soil moisture

  • W. Hu
  • Q. XuEmail author
  • G. H. Wang
  • T. W. J. van Asch
  • P.-Y. Hicher
Original Paper

Abstract

The initiation of debris flows is commonly attributed either to fluidization as a result of rainfall-induced landslides or to gully erosion induced by concentrated runoffs. A series of flume tests have been performed to show how the initial soil moisture influences the initiation of debris flows. At the start of each experiment, surface runoff was generated over loose granular deposits, triggering debris flows. These experimental debris flows enacted different scenarios according to the small variations among the initial soil moistures. In the loose granular deposits with initial soil moistures ranging from 1 to 5 %, most runoff water could infiltrate and trigger a landslide, which accelerated within 1 s to speed over 1 ms−1 and then transformed into a debris flow. In the same soil deposits with initial moistures >5 or <1 %, the debris flow was initiated by slow gully erosion with episodic events of damming and breaching due to small-scale landslides occurring on the side-slopes of the erosion valley. The slope failures were not triggered by positive pore pressure but by a decrease in suction due to the wetting of the soil. This suction decrease in initially unsaturated slopes explains why the transformation of these slope failures into debris flows are due not only to an increase of pore pressure leading to soil liquefaction, which is one of the expected triggering mechanisms, but also to a loss of the cohesive strength of the soil.

Keywords

Debris flow Initial moisture Runoff Internal erosion 

Notes

Acknowledgments

This research is financially supported by National fundamental scientific research grant of China (No. 41102188); public welfare project from the Ministry of Land and Resources of People’s Republic of China (2013–11122); and the National Science Found for Distinguished Young Scholars of China (Grant No. 41225011).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • W. Hu
    • 1
  • Q. Xu
    • 1
    Email author
  • G. H. Wang
    • 2
  • T. W. J. van Asch
    • 1
    • 3
  • P.-Y. Hicher
    • 4
  1. 1.State Key Laboratory of Geo-Hazard Prevention and Geo-Environment ProtectionChengdu University of TechnologyChengduPeople’s Republic of China
  2. 2.Disaster Prevention Research InstituteKyoto UniversityKyotoJapan
  3. 3.Faculty of GeosciencesUtrecht UniversityUtrechtThe Netherlands
  4. 4.LUNAM University, Ecole Centrale de Nantes, CNRS UMR 6183NantesFrance

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