期刊
LANDSLIDES
卷 18, 期 1, 页码 43-58出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10346-020-01478-4
关键词
Landslide-generated debris flow; Vegetation; Evolution process; Two-phase debris flow; Numerical modeling
资金
- CAS Original Innovation Program [ZDBS-LY-DQC039]
- National Natural Science Foundation of China [41907241, 41790433, 41772312]
- CAS Light of West China Program
The study aimed to investigate the formation and propagation processes of landslide-generated debris flows in vegetated areas by considering the effects of vegetation. The proposed comprehensive model effectively described the behaviors of each stage in the process and analyzed the roles of vegetation in different stages.
This study aimed to investigate the formation and propagation processes of a landslide-generated debris flow within a small catchment while considering the effects of vegetation. This process is divided into three stages: rainfall infiltration, slope failure, and debris flow routing, according to their different mechanisms. Existing models that involve the effect of vegetation for each stage, including Richards's model, infinite slope stability model, and the enhanced two-phase debris flow model (Pudasaini2012), were coupled. The tridiagonal matrix algorithm and finite volume method were applied to solve these equations, respectively. Finally, the approach was tested by application to the 2018 debris flow event in the Yindongzi catchment, China. The results showed that the proposed comprehensive model could effectively describe the behaviors of each stage during the formation and propagation processes of landslide-generated debris flows in vegetated area. The roles of vegetation on each stage, such as root water uptake and root soil reinforcement, were also analyzed by performing several scenarios.
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