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Journal of Mountain Science

, Volume 8, Issue 6, pp 757–766 | Cite as

Two-dimensional numerical model for debris flows in the Jiangjia Gully, Yunnan Province

  • Hong Peng
  • Yanxin Zhao
  • Peng Cui
  • Wanshun ZhangEmail author
  • Xuejiao Chen
  • Xiaoqing Chen
Article

Abstract

Debris flows are recurrent natural hazards in many mountainous regions. This paper presents a numerical study on the propagation of debris flows in natural erodible open channels, in which the bed erosion and sedimentation processes are important. Based on the Bingham fluid theory, a mathematical model of the two-dimensional non-constant debris flow is developed. The governing equations include the continuity and momentum conservation equations of debris flow, the sediment convection-diffusion equation, the bed erosion-deposition equation and the bed-sediment size gradation adjustment equation. The yield stress and shear stress components are included to describe the dynamic rheological properties. The upwind control-volume Finite Volume Method (FVM) is applied to discretize the convection terms. The improved SIMPLE algorithm with velocity-free-surface coupled correction is developed to solve the equations on non-orthogonal, quadrilateral grids. The model is applied to simulate a debris flow event in Jiangjia Gully, Yunnan Province and to predict the flow pattern and bed erosion-deposition processes. The results show the effectiveness of the proposed numercial model in debris flow simulation and potential hazard analysis.

Keywords

Debris flow Numerical simulation SIMPLE algorithm Finite Volume Method Hazard analysis Jiangjia Gully 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Hong Peng
    • 1
  • Yanxin Zhao
    • 2
  • Peng Cui
    • 3
  • Wanshun Zhang
    • 2
    Email author
  • Xuejiao Chen
    • 2
  • Xiaoqing Chen
    • 3
  1. 1.College of Water Resources and Hydropower EngineeringWuhan UniversityWuhanChina
  2. 2.School of Resource and Environmental ScienceWuhan UniversityWuhanChina
  3. 3.Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina

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