Variable-Concentration and Boundary Effects on Debris Flow Discharge Predictions
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 9
Abstract
The uniform flow of natural debris mixture is generally modeled assuming a uniform solid concentration and the absence of lateral walls. The resulting flow discharges are, however, higher than those observed and, in the case of erodible boundaries, the equilibrium between the moving and nonmoving mixtures cannot be simulated. Such a model also cannot simulate the effect of lateral rigid boundaries that generate lateral velocity and concentration gradients. This paper describes a numerical model to determine the concentration and velocity distribution in the two directions transverse to the flow. The model is applied to a uniform laminar flow of a mixture with a shear-thickening Herschel–Bulkley constitutive behavior, with rheological parameters expressed in terms of the local solid concentration, and allows the simulation of different conditions in the presence of both erodible and rigid boundaries.
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Acknowledgments
The writers wish to thank the reviewers whose comments and suggestions greatly helped to improve the quality of the paper.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 9 • September 2008
Pages: 1294 - 1301
Copyright
© 2008 ASCE.
History
Received: Nov 30, 2006
Accepted: Jan 7, 2008
Published online: Sep 1, 2008
Published in print: Sep 2008
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