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The effects of flow stratification by non-cohesive sediment on transport in high-energy wave-driven flows

Published online by Cambridge University Press:  08 August 2008

DANIEL C. CONLEY ,
SILVIA FALCHETTI ,
IRIS P. LOHMANN  and
MAURIZIO BROCCHINI
DANIEL C. CONLEY
Affiliation:
Marine Institute, University of Plymouth, Plymouth, UK
SILVIA FALCHETTI
Affiliation:
NATO Undersea Research Centre, La Spezia, Italy Dipartimento di Ingegneria delle Costruzioni, dell'Ambiente e del Territorio, Università di Genova, 16145 Genova, Italy
IRIS P. LOHMANN
Affiliation:
SimCorp A/S, Copenhagen, Denmark
MAURIZIO BROCCHINI
Affiliation:
Istituto di Idraulica e Infrastrutture Viarie, Univesità Politecnica delle Marche, Ancona, Italy
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Abstract

The two-way effects of the time-varying suppression of turbulence by gradients in suspended sediment concentration have been investigated using a modified form of the Generalized Ocean Turbulence Model (GOTM). Field measurements of fluid velocities and sediment concentrations collected under high-energy conditions (mobility number ≈ 900) have been simulated both including and neglecting the feedback between sediment and turbulence. The results show that, when present, this feedback increases the wave-coherent component of transport relative to the mean component of transport, which can even change the direction of transport. Comparisons between measured and simulated time series of near-bed sediment concentrations show great coherence (0.95 correlation) and it is argued that the differences in net transport rates may be partially explained by the use of a uniform grain size in the simulations. It is seen that the effects of sediment stratification scale with orbital velocity divided by sediment setting velocity, um/ws, for all grain sizes.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 610 , 10 September 2008 , pp. 43 - 67
Copyright
Copyright © Cambridge University Press 2008

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