Sediment Transport over Ripples in Oscillatory Flow
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 2
Abstract
In this paper, we present results of a large-eddy simulation of flow and suspended sediment transport around prototypical ripples based on “long-wave ripples” as measured at Duck, N.C., in waves of height and period of . Solving the volume-filtered Navier–Stokes equations for the momentum and an advection–diffusion equation with a setting term for the suspended sediment, we obtain time-dependent, three-dimensional descriptions of the velocity, pressure, and sediment concentration fields. Although the main flow and sediment transport patterns are governed by a quasi-two-dimensional vortex formation–ejection mechanism, we illustrate the three-dimensional structure of both, and make qualitative comparisons with the results of other researchers. We conclude with analysis of concentration time series measured at a point and interpret them within the larger framework of the flow. The present simulations demonstrate that the flow over these larger-scale ripples resembles that over vortex ripples quite strongly.
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Acknowledgments
The writers are grateful for the financial support from Grant No. ONRN00014-99-1-0440 of the Coastal Geosciences Program, Office of Naval Research (Dr. Tom Drake, Program Manager). This work was supported in part by a grant of computer time from the DOD High Performance Computing Modernization Program at the Alaska Regional Supercomputing Center.
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Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 2 • February 2006
Pages: 180 - 193
Copyright
© 2006 ASCE.
History
Received: Dec 23, 2003
Accepted: Apr 1, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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