Two-Dimensional Nonequilibrium Noncohesive and Cohesive Sediment Transport Model
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 5
Abstract
The purpose of this paper is to develop an unsteady 2D depth-averaged model for nonuniform sediment transport in alluvial channels. In this model, the orthogonal curvilinear coordinate system is adopted; the transport mechanisms of cohesive and noncohesive sediment are both embedded; the suspended load and bed load are treated separately. In addition, the processes of hydraulic sorting, armoring, and bed consolidation are also included in the model. The implicit two-step split-operator approach is used to solve the flow governing equations and the coupling approach with iterative method are used to solve the mass-conservation equation of suspended sediment, mass-conservation equation of active-layer sediment, and global mass-conservation equation for bed sediment simultaneously. Three sets of data, including suspension transport, degradation and aggradation cases for noncohesive sediment, and aggradation, degradation, and consolidation cases for cohesive sediment, have been demonstrated to show the rationality and accuracy of the model. Finally, the model is applied to evaluate the desilting efficiency for Ah Gong Diann Reservoir located in Taiwan to show its applicability.
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Acknowledgments
Partial financial support of this study from the National Science Council of Taiwan, R.O.C., through Contract No. NSCTNSC-89-2211-E009-031 and South Water Resources Office, Water Resources Agency, Ministry of Economic Affairs, Taiwan, R.O.C. are greatly appreciated. The experimental data provided by Water Resources Planning Institute, Water Resources Agency, Ministry of Economic Affairs, Taiwan R.O.C. is also appreciated. The computer resources used in this study were all executed on an IBM SP2 SMP machine, which was provided by the National Center for High-Performance Computing of Taiwan, R.O.C.
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Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 5 • May 2009
Pages: 369 - 382
Copyright
© 2009 ASCE.
History
Received: Dec 2, 2004
Accepted: Dec 8, 2006
Published online: May 1, 2009
Published in print: May 2009
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