One-Dimensional Mathematical Model for Suspended Sediment by Lateral Integration
Publication: Journal of Hydraulic Engineering
Volume 124, Issue 7
Abstract
Although a one-dimensional (1D) mathematical model based on the nonequilibrium transport of sediment is rational in principle, its application to rivers requires empirical determination of a key coefficient in the basic equation of transport, this is known as the adjustment coefficient. It also requires, as all 1D models do, empirical and rather arbitrary apportioning of the computed total scour or deposition to the wetted perimeter. In this paper an attempt is made to avoid both. The equation of sediment transport is written for a vertical stream tube of infinitesimal width for which the adjustment coefficient has been rationally determined. A procedure of lateral integration is then applied to obtain the global values of the said coefficient for the entire cross section and the distribution of deposition/erosion to the wetted perimeter. The shape of the cross section is thus determined along with the amount of deposition/erosion. Results obtained with this model compare favorably with those of depth-integrated two-dimensional (2D) computations and physical model testing, both carried out for the dam neighborhood of the Three Gorges Project.
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Copyright © 1998 American Society of Civil Engineers.
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Published online: Jul 1, 1998
Published in print: Jul 1998
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