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Mechanism of the intermittent motion of two-phase debris flows
Liqun Lyu1; Zhaoyin Wang1; P. Cui2
Corresponding AuthorZhaoyin Wang

A typical two-phase debris flow exhibits a high and steep flow head consisting of rolling boulders and cobbles with intermittent or fluctuating velocity. The relative motion between the solid phase and the liquid phase is obvious. The motion of a two-phase debris flow depends not only on the rheological properties of the flow, but also on the energy transmission between the solid and liquid phases. Several models have been developed to study two-phase debris flows. An essential shortcoming of most of these models is the omission of the interaction between the two phases and identification of the different roles of the different materials in two-phase debris flows. The tracer particles were used for the velocity of solid phase and the velocity of liquid phase was calculated by the water velocity on the surface of the debris flow in the experiments. This paper analyzed the intermittent feature of two-phase debris flows based on videos of debris flows in the field and flume experiments. The experiments showed that the height of the head of the two-phase debris flow increased gradually in the initiation stage and reached equilibrium at a certain distance from the start of the debris flow. The height growth and the velocity of the flow head showed fluctuating characteristics. Model equations were established and the analyses proved that the average velocity of the two-phase debris flow head was proportional to the flood discharge and inversely proportional to the volume of the debris flow head.

KeywordTwo-phase Debris Flow Intermittent Motion Unsteady Flow Flow Power Energy Dissipation
Indexed BySCI
WOS IDWOS:000397199500007
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Mt Hazard & Earths Surface Proc Key Lab, Chengdu, Peoples R China
Recommended Citation
GB/T 7714
Liqun Lyu,Zhaoyin Wang,P. Cui. Mechanism of the intermittent motion of two-phase debris flows[J]. ENVIRONMENTAL FLUID MECHANICS,2017,17(1):139-158.
APA Liqun Lyu,Zhaoyin Wang,&P. Cui.(2017).Mechanism of the intermittent motion of two-phase debris flows.ENVIRONMENTAL FLUID MECHANICS,17(1),139-158.
MLA Liqun Lyu,et al."Mechanism of the intermittent motion of two-phase debris flows".ENVIRONMENTAL FLUID MECHANICS 17.1(2017):139-158.
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