One-Dimensional Modeling of Dam-Break Flow over Movable Beds
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Volume 133, Issue 1
Abstract
A one-dimensional model has been established to simulate the fluvial processes under dam-break flow over movable beds. The hydrodynamic model adopts the generalized shallow water equations, which consider the effects of sediment transport and bed change on the flow. The sediment model computes the nonequilibrium transport of bed load and suspended load. The effects of sediment concentration on sediment settling and entrainment are considered in determining the sediment settling velocity and transport capacity. In particular, a correction factor is proposed to modify the Van Rijn formulas of equilibrium bed-load transport rate and near-bed suspended-load concentration for the simulation of sediment transport under high-shear flow conditions. The governing equations are solved by an explicit finite-volume method with the first-order upwind scheme for intercell fluxes. The model has been tested in two experimental cases, with fairly good agreement between simulations and measurements. The sensitivities of the model results to parameters such as the sediment nonequilibrium adaptation length, Manning’s roughness coefficient and the proposed correction factor have been verified. The proposed model has also been compared to an existing model and the results indicate the new model is more reliable.
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Acknowledgments
This study is part of the research project sponsored by the USDA-ARS Specific Research Agreement No. 58-6408-2-0062 (monitored by the USDA-ARS National Sedimentation Laboratory) and the University of Mississippi.
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Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 1 • January 2007
Pages: 48 - 58
Copyright
© 2007 ASCE.
History
Received: Apr 22, 2005
Accepted: Nov 8, 2005
Published online: Jan 1, 2007
Published in print: Jan 2007
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