Journal article

The Hydrodynamic Response of the Sediment-Water Interface to Coherent Turbulent Motions

Joey J Voermans, Marco Ghisalberti, Gregory N Ivey

GEOPHYSICAL RESEARCH LETTERS | AMER GEOPHYSICAL UNION | Published : 2018

Abstract

Unique observations of the hydrodynamics across the sediment-water interface are used to quantify the instantaneous response of the interstitial fluid to the passage of coherent turbulent motions in the overlying flow. Over a range of permeability Reynolds numbers ReK=√Ku∗/ν (where K is the sediment permeability, u∗ is the shear velocity, and ν is the fluid viscosity), the passage of these turbulent motions create velocity fluctuations and momentum fluxes at the sediment-water interface to greatly exceed their mean values. Sweep motions are observed to penetrate into the sediment bed and induce instantaneous momentum fluxes that can be an order of magnitude larger than the mean bed shear str..

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Grants

Awarded by Australian Research Council


Funding Acknowledgements

This research was supported under the Australian Research Council's Discovery Projects funding scheme (project DP120102500). The authors would like to thank the reviewers for their comments and suggestions. The data used in creating the figures are available in a repository (https://doi.org/10.5281/zenodo.1217818).