Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation

Author:

Ardhuin Fabrice1,Rogers Erick2,Babanin Alexander V.3,Filipot Jean-François1,Magne Rudy1,Roland Aaron4,van der Westhuysen Andre5,Queffeulou Pierre1,Lefevre Jean-Michel6,Aouf Lotfi6,Collard Fabrice7

Affiliation:

1. Service Hydrographique et Océanographique de la Marine, Brest, France

2. Oceanography Division, Naval Research Laboratory, Stennis Space Center, Mississippi

3. Swinburne University, Hawthorn, Victoria, Australia

4. Technological University of Darmstadt, Darmstadt, Germany

5. * Deltares, Delft, Netherlands

6. UMR GAME, Météo-France–CNRS, Toulouse, France

7. Radar Division, CLS, Plouzané, France

Abstract

Abstract New parameterizations for the spectral dissipation of wind-generated waves are proposed. The rates of dissipation have no predetermined spectral shapes and are functions of the wave spectrum and wind speed and direction, in a way consistent with observations of wave breaking and swell dissipation properties. Namely, the swell dissipation is nonlinear and proportional to the swell steepness, and dissipation due to wave breaking is nonzero only when a nondimensional spectrum exceeds the threshold at which waves are observed to start breaking. An additional source of short-wave dissipation is introduced to represent the dissipation of short waves due to longer breaking waves. A reduction of the wind-wave generation of short waves is meant to account for the momentum flux absorbed by longer waves. These parameterizations are combined and calibrated with the discrete interaction approximation for the nonlinear interactions. Parameters are adjusted to reproduce observed shapes of directional wave spectra, and the variability of spectral moments with wind speed and wave height. The wave energy balance is verified in a wide range of conditions and scales, from the global ocean to coastal settings. Wave height, peak and mean periods, and spectral data are validated using in situ and remote sensing data. Some systematic defects are still present, but, overall, the parameterizations probably yield the most accurate estimates of wave parameters to date. Perspectives for further improvement are also given.

Publisher

American Meteorological Society

Subject

Oceanography

Reference103 articles.

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