Three-Dimensional Numerical Modeling of Dam-Break Flows with Sediment Transport over Movable Beds
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Volume 141, Issue 1
Abstract
A three-dimensional (3D) numerical model has been developed to simulate dam-break flows with sediment transport over movable beds. The hydrodynamic model solves the 3D Reynolds-averaged Navier-Stokes equations using a finite-volume method on collocated hexahedral meshes. The volume-of-fluid (VOF) technique with the compressive interface capturing scheme for arbitrary meshes is used to track the water surface boundary. The sediment transport model solves the nonequilibrium transport equations of suspended load and bed load separately, and in turn calculates the resulting bed change. A moving mesh technique is adopted to track the time evolution of bed topography. The grid moving velocity and computational cell volume change due to the moving mesh are taken into consideration when the hydrodynamic and sediment transport equations are discretized. The developed model has been tested using several experimental dam-break flows over movable beds. The calculated temporal and spatial variations of water and bed surfaces are in generally good agreement with the measured data. The effects of 3D features of the flow on morphological changes are discussed by comparing the results of the present model with results calculated by one-dimensional (1D) and two-dimensional (2D) models documented in the literature. The comparisons reveal that the present 3D model improves the accuracy of calculated morphological changes at the initial stages of dam-break flow, near the wave front, and around in-stream structures.
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Acknowledgments
The research reported in this paper was supported by the U.S. Department of Homeland Security-sponsored Southeast Region Research Initiative (SERRI) at the U.S. DOE Oak Ridge National Laboratory, and by the USDA-Agricultural Research Service (ARS) Specific Research Agreement No. 58-6408-7-236 (monitored by the USDA-ARS National Sedimentation Laboratory). The first writer also acknowledges the dissertation fellowship provided by the University of Mississippi.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 141 • Issue 1 • January 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 6, 2013
Accepted: Aug 21, 2014
Published online: Sep 26, 2014
Published in print: Jan 1, 2015
Discussion open until: Feb 26, 2015
ASCE Technical Topics:
- Bed materials
- Dam failures
- Disaster risk management
- Disasters and hazards
- Engineering fundamentals
- Failures (by type)
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Hydrologic engineering
- Man-made disasters
- Models (by type)
- Movable bed models
- Numerical models
- River and stream beds
- River engineering
- Rivers and streams
- Sediment
- Sediment transport
- Simulation models
- Three-dimensional flow
- Three-dimensional models
- Water and water resources
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