Estimation of kinetic energy dissipation from breaking waves in the wave crest region

Lee, J. H., Monty, J. P., Elsnab, J., Toffoli, A., Babanin, A. V. and Alberello, A. (2017) Estimation of kinetic energy dissipation from breaking waves in the wave crest region. Journal of Physical Oceanography, 47 (5). pp. 1145-1150. ISSN 0022-3670

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Abstract

Wave-induced turbulence due to breaking in the absence of surface shear stresses is investigated experimentally. A high-fidelity particle image velocimetry (PIV) technique is used to measure the turbulence near the water surface, inside the wave crests. The spatial velocity vector fields of the breaking waves acquired from PIV provide accurate vertical velocity profiles near the air-water interface, as well as wavenumber velocity spectra beneath the breaking waves at different depths. These velocity spectra exhibit a Kolmogorov interval at high wavenumbers, indicating the presence of isotropic turbulence and permitting an estimation of energy dissipation rates. The depth dependence of dissipation rates of the breaking waves generated in the laboratory shows a scaling similar to that found in wind-forced breaking waves in the field. A phase dependence in the dissipation rates of turbulence kinetic energy is also observed, which should be considered to improve the accuracy of the estimated and modeled wave energy dissipation.

Item Type: Article
Additional Information: Funding Information: The authors acknowledge the Australian Research Council for the financial support of this work. A.V.B. gratefully acknowledges funding for this study from the Australian Research Council 703 Discovery Grant DP130100227 and the U.S. Office of Naval Research Grant N00014-13-1-0278. Publisher Copyright: © 2017 American Meteorological Society.
Uncontrolled Keywords: kinetic energy,turbulence,wave breaking,wind stress,oceanography ,/dk/atira/pure/subjectarea/asjc/1900/1910
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Depositing User: LivePure Connector
Date Deposited: 04 Dec 2021 01:41
Last Modified: 08 Dec 2021 09:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/82546
DOI: 10.1175/JPO-D-16-0273.1

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