Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhessd-2-4487-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
26 Jun 2014
Review status
This discussion paper has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The revised manuscript was not accepted.
A theoretical model for the initiation of debris flow in unconsolidated soil under hydrodynamic conditions
C.-X. Guo1,2, J.-W. Zhou3,4, P. Cui1, M.-H. Hao4, and F.-G. Xu4 1Key Laboratory of Mountain Hazards and Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610044, China
2University of Chinese Academy of Science, Beijing, 100049, China
3State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China
4College of Water Resources & Hydropower, Sichuan University, Chengdu, Sichuan 610065, China
Abstract. Debris flow is one of the catastrophic disasters in an earthquake-stricken area, and remains to be studied in depth. It is imperative to obtain an initiation mechanism and model of the debris flow, especially from unconsolidated soil. With flume experiments and field investigation on the Wenjiagou Gully debris flow induced from unconsolidated soil, it can be found that surface runoff can support the shear force along the slope and lead to soil strength decreasing, with fine particles migrating and forming a local relatively impermeable face. The surface runoff effect is the primary factor for accelerating the unconsolidated slope failure and initiating debris flow. Thus, a new theoretical model for the initiation of debris flow in unconsolidated soil was established by incorporating hydrodynamic theory and soil mechanics. This model was validated by a laboratory test and proved to be better suited for unconsolidated soil failure analysis. In addition, the mechanism analysis and the established model can provide a new direction and deeper understanding of debris flow initiation with unconsolidated soil.

Citation: Guo, C.-X., Zhou, J.-W., Cui, P., Hao, M.-H., and Xu, F.-G.: A theoretical model for the initiation of debris flow in unconsolidated soil under hydrodynamic conditions, Nat. Hazards Earth Syst. Sci. Discuss., 2, 4487-4524, doi:10.5194/nhessd-2-4487-2014, 2014.
C.-X. Guo et al.
C.-X. Guo et al.

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