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- Publisher
- American Meteorological Society
- Copyright
- Copyright © 2016 American Meteorological Society
- ISSN
- 0022-3670
- eISSN
- 1520-0485
- DOI
- 10.1175/JPO-D-16-0273.1
- Publisher site
- See Article on Publisher Site
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.
Journal
Journal of Physical Oceanography – American Meteorological Society
Published: Dec 14, 2016