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Idealized Debris Flow in Flume with Bed Driven by a Conveyor Belt

by Chi-Hai Ling, US Geological Survey, United States,
Cheng-lung Chen, US Geological Survey, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The generalized viscoplastic fluid (GVF) model is used to derive the theoretical expressions of two-dimensional velocities and surface profile for debris flow established in a flume with bed driven by a conveyor belt. The rheological parameters of the GVF model are evaluated through the comparison of theoretical results with measured data. A slip velocity of the established (steady) nonuniform flow on the moving bed (i.e., the conveyor belt) is observed, and a relation between the slip velocity and the velocity gradient at the bed is derived. Two belts, one rough and the other smooth, were tested. The flow profile in the flume is found to be linear and dependent on the roughness of the belt, but not much on its speed.

Subject Headings: Fluid flow | Fluid velocity | Two-dimensional models | Solids flow | Fluidized bed technology | Fluid mechanics | Flow profiles

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