Author(s): M. Arai; X. Liu
Linked Author(s):
Keywords: Viscous debris flow; Roll wave; Friction factor and Froude number
Abstract: Viscous debris flows which occur frequently in China have a volume concentration of around 70% and flow down in intermittent surges in channels with a slope of 5 degrees. It is not clear why the flow flows down channel with intermittent surges, nor how the surges are formed. In this paper, the conditions of the incidence of roll waves in viscous debris flows are derived from mass and momentum conservation equations in which the friction coefficient plays an important role in the resistance force of the flow. It is demonstrated that some intermittent surges occurred in the viscous debris flow in the laboratory, and the incidence of roll waves on the half flume is explained by changing in the velocity profile.
Year: 2003