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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Experimental study on the unsteady characteristics of the two-phase debris flow
Experimental study on the unsteady characteristics of the two-phase debris flow
Debris flows are classified into one-phase and two-phase flows according to their movement features and the size
distributions of solid particles. The two-phase debris flow is the mixture of the liquid phase composed of water and clay
and silt and the solid phase composed of gravel, cobbles and boulders. There is apparent relative movement between
the liquid phase and the solid phase in the two-phase debris flow and there is no relative movement between the
particles and liquid in one-phase debris flows. The intermittent motion of one-phase debris flow has been reported and
studied but few have been done on the intermittency of two-phase debris flows. This paper report the intermittent feature
of two-phase debris flows in the nature and physical model experiments in a flume. The surge character in the
experiments of the two-phase debris flow was obvious, and the head of the debris flow moved intermittently. In the
experiment water flow initiated sediment from bed and side slopes and transported gravel particles to the front,
accumulation of the gravel in the front of the flow made the height and front slop of the debris flow increase. Suddenly,
the gravel moved forward as the slop reaches the critical value. Then the head height and slope reduced to some value
and the flow stag again. The sediment supply from upstream and energy accumulation caused the debris flow moving
again. Based on the two-phase debris flow experiments, the article studies the formation and development of intermittent
surges process and establishes the mechanical model.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 20/08/2015
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