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| Titel |
Large eddy simulation of sediment transport over rippled beds |
| VerfasserIn |
J. C. Harris, S. T. Grilli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 1, no. 1 ; Nr. 1, no. 1 (2014-04-22), S.755-801 |
| Datensatznummer |
250115091
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| Publikation (Nr.) |
 copernicus.org/npgd-1-755-2014.pdf |
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| Zusammenfassung |
| Wave-induced Boundary Layer (BL) flows over sandy rippled bottoms
are studied using a numerical model that applies a one-way coupling
of a "far-field" inviscid flow model to a "near-field" Large
Eddy Simulation (LES) Navier–Stokes (NS) model. The incident
inviscid velocity and pressure fields force the LES, in which
near-field, wave-induced, turbulent bottom BL flows are simulated.
A sediment suspension and transport model is embedded within the
coupled flow model. The numerical implementation of the various
models has been reported elsewhere, where we showed that the LES was
able to accurately simulate both mean flow and turbulent statistics
for oscillatory BL flows over a flat, rough bed. Here, we show that
the model accurately predicts the mean velocity fields and suspended
sediment concentration for oscillatory flows over full-scale vortex
ripples. Tests show that surface roughness has a significant effect
on the results. Beyond increasing our insight into wave-induced
oscillatory bottom BL physics, models of sediment transport as
sophisticated as the present coupled model have the potential to
make quantitative predictions of sediment transport and
erosion/accretion around partly buried objects in the bottom, which
is important for a vast array of bottom deployed instrumentation and
other practical ocean engineering problems. |
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