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Article Dans Une Revue Journal of Physical Oceanography Année : 2010

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

Erick Rogers
  • Fonction : Auteur
Alexander V. Babanin
  • Fonction : Auteur
Rudy Magne
  • Fonction : Auteur
Aaron Roland
  • Fonction : Auteur
Andre van der Westhuysen
  • Fonction : Auteur
Jean-Michel Lefevre
  • Fonction : Auteur
Lotfi Aouf
  • Fonction : Auteur
Fabrice Collard
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-04498822 , version 1 (11-03-2024)

Identifiants

Citer

Fabrice Ardhuin, Erick Rogers, Alexander V. Babanin, Jean-Francois Filipot, Rudy Magne, et al.. Semiempirical Dissipation Source Functions for Ocean Waves. Part I: Definition, Calibration, and Validation. Journal of Physical Oceanography, 2010, 40 (9), pp.1917-1941. ⟨10.1175/2010JPO4324.1⟩. ⟨hal-04498822⟩
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