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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 |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 21, no. 6 ; Nr. 21, no. 6 (2014-12-05), S.1169-1184 |
| Datensatznummer |
250120957
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| Publikation (Nr.) |
 copernicus.org/npg-21-1169-2014.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, sophisticated coupled models of
sediment transport such as that presented 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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