Simulating Sediment Transport in a Flume with Forced Pool-Riffle Morphology: Examinations of Two One-Dimensional Numerical Models
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 7
Abstract
One-dimensional numerical sediment transport models (DREAM-1 and DREAM-2) are used to simulate seven experimental runs designed to examine sediment pulse dynamics in a physical model of forced pool-riffle morphology. Comparisons with measured data indicate that DREAM-1 and -2 closely reproduce the sediment transport flux and channel bed adjustments following the introduction of fine and coarse sediment pulses, respectively. The cumulative sediment transport at the flume exit in a DREAM-1 simulation is within 10% of the measured values, and cumulative sediment transport at flume exit in a DREAM-2 simulation is within a factor of 2 of the measured values. Comparison of simulated and measured reach-averaged aggradation and degradation indicates that 84% of DREAM-1 simulation results have errors less than , which is approximately 77% of the bed material geometric mean grain size or 3.7% of the average water depth. A similar reach-averaged comparison indicates that 84% of DREAM-2 simulation results have errors less than , which is approximately 1.7 times the bed material geometric mean grain size or 11% of the average water depth. Simulations using measured thalweg profiles as the input for the initial model profile produced results with larger errors and unrealistic aggradation and degradation patterns, demonstrating that one-dimensional numerical sediment transport models need to be applied on a reach-averaged basis.
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Acknowledgments
Funding for this study was provided by CALFED Ecosystem Restoration Program (Grant No. UNSPECIFIEDERP-02D-P55). The writers appreciate the guidance from the project’s scientific advisory committee members: Thomas Lisle, Scott McBain, Gary Parker, Kris Vyverberg, and Peter Wilcock, and the strong support from former and current Stillwater project directors: Frank Ligon, Craig Fixler, and Pete Downs. This manuscript benefited greatly from the very constructive comments to previous drafts by Derek Booth, Frank Ligon, two anonymous reviewers, and the associate editor.
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Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 7 • July 2008
Pages: 892 - 904
Copyright
© 2008 ASCE.
History
Received: Dec 11, 2006
Accepted: Nov 14, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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