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Kinematic wave model for transient bed profiles in alluvial channels under nonequilibrium conditions

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Title: Kinematic wave model for transient bed profiles in alluvial channels under nonequilibrium conditions
Author: Tayfur, Gokmen; Singh, Vijay P.
Abstract: Transient bed profiles in alluvial channels are generally modeled using diffusion (or dynamic) waves and assuming equilibrium between detachment and deposition rates. Equilibrium sediment transport can be considerably affected by an excess (or deficiency) of sediment supply due to mostly flows during flash floods or floods resulting from dam break or dike failure. In such situations the sediment transport process occurs under nonequilibrium conditions, and extensive changes in alluvial river morphology can take place over a relatively short period of time. Therefore the study and prediction of these changes are important for sustainable development and use of river water. This study hence developed a mathematical model based on the kinematic wave theory to model transient bed profiles in alluvial channels under nonequilibrium conditions. The kinematic wave theory employs a functional relation between sediment transport rate and concentration, the shear-stress approach for flow transport capacity, and a relation between flow velocity and depth. The model satisfactorily simulated transient bed forms observed in laboratory experiments.
Description: An edited version of this paper was published by AGU. Copyright 2007 American Geophysical Union.
Publisher: American Geophysical Union
Subject: bed profile
alluvial channel
detachment rate
deposition rate
equilibrium
nonequilibrium
Department: Civil Engineering
Biological and Agricultural Engineering
URI: http://dx.doi.org/10.1029/2006WR005681
Date: 2007-12-27

Citation

Tayfur, G., and V. P. Singh (2007), Kinematic wave model for transient bed profiles in alluvial channels under nonequilibrium conditions, Water Resources Reseach, 43, doi:10.1029/2006WR005681. To view the published open abstract, go to http://dx.doi.org and enter the DOI.

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