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Measurements of sediment diffusivity profiles over rippled beds under waves

Thorne, Peter D.; Davies, Alan G.; Bell, Paul. 2008 Measurements of sediment diffusivity profiles over rippled beds under waves. In: PECS 2008: Physics of Estuaries and Coastal Seas, Liverpool, UK, 25th - 29th August 2008. Liverpool, 361-364.

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Abstract/Summary

Predictions for the form of suspended sediment concentration profiles differ according to the flow, the seabed sediment and, importantly, the bed forms. Most of the formulations used are underpinned by the classical Fickian concept of gradient diffusion originating from kinetic molecular theory, where random molecular movements induce mixing. In the case of suspended sediments in field situations, it is the turbulent fluctuations in the vertical velocity component that give rise to the upward mixing process. In the simplest case the time averaged vertical turbulent diffusion of sediment, qv, is considered to be balanced by the settling of the suspended sediment under gravity

Item Type: Publication - Conference Item (Paper)
Programmes: Oceans 2025 > Shelf and coastal processes
Additional Keywords: ACOUSTICS; DIFFUSIVITY; SUSPENSIONS; WAVES; RIPPLES
NORA Subject Terms: Marine Sciences
Date made live: 17 Mar 2009 13:26
URI: http://nora.nerc.ac.uk/id/eprint/6492

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