Simulation of Bed-Load Dispersion Process
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 3
Abstract
Two general dispersion models suitable for nonequilibrium bed-load transport were constructed. The first one, called the P model, is based on the probability of migration for specific groups of sediment particles. The second one, called the D model, is derived from the advection equation discretized in finite-difference form, which is equivalent to the general dispersion equation. By comparing these models, it is found that the D model can be treated like the P model in some respects. The Courant number, in the D model has the same physical meaning as the probability of migration, P, in the P model. Although the D model and P model were based on different concepts, the simulated bed-load transport rates, which result from their application, are the same. Therefore, the dispersion equation was replaced by the numerical algorithm of the advection equation (D model) to examine several dispersion phenomena of bed-load transport. To explore further the nonequilibrium dispersion process, a series of flume experiments was conducted by using color-painted fine gravels. Having compared model simulation results and experimental data, it is shown that the models derived in this study have a reasonably good agreement with the experimental results. In summary, this study has indirectly proven that the D model, which is equivalent to the dispersion equation, is capable of simulating the nonequilibrium bed-load transport.
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Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 3 • March 2002
Pages: 331 - 342
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Mar 16, 2000
Accepted: Aug 22, 2001
Published online: Mar 1, 2002
Published in print: Mar 2002
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