Kinematic wave model for transient bed profiles in alluvial channels under nonequilibrium conditions
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Date
2007-12-27
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Publisher
American Geophysical Union
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.
Keywords
bed profile, alluvial channel, detachment rate, deposition rate, equilibrium, nonequilibrium
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.