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39th International Liège Colloquium on Ocean Dynamics and 3rd Warnemünde Turbulence Days (7-11 May 2007). Turbulence re-revisited: abstracts

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Untitled 39th International Liège Colloquium on Ocean Dynamics And 3rd Warnemünde Turbulence Days (7-11 May 2007) TURBULENCE RE-REVISITED ABSTRACTS 2007 The cocktail party of Monday will be sponsored by: Rockland Oceanographic Services Inc ISW Wassermesstechnik ALEC Electronics Co. Mixing and wave energy dissipation in the presence of surface gravity waves: a review Fabrice Ardhuin SHOM, Brest, France Surface gravity waves are the largest source of turbulent kinetic energy (TKE) for the world ocean, shaping the surface boundary layer and forcing the mean circulation in shallow waters where the divergence in wave momentum flux generates energetic currents. Constraints on wind- wave growth and observed turbulence below breaking waves gives some information on the magnitude of the surface flux of TKE and its depth of penetration. In reverse, the observed wind stress in the presence of swell gives a constraint of the upward flux of momentum and energy to the atmosphere. These constraints may be used to refine models of turbulence closure in the presence of waves. These are well developed for the atmospheric boundary layer with visco-elastic models that account for the rapid distortion of the turbulence outside of an inner layer. These models may provide swell attenuation rates, a major unknown in today’s operational wave forecasting models. We give here some first applications and calibrations of this type of model on the global scale and a comparison with observed swell attenuation rates. On the water-side, it has been shown that the same rapid distortion approach for short waves provides a rate of production of TKE due to the mean straining of turbulence by the Stokes drift. Besides, other types of models, using classical eddy viscosities or k-l turbulence closures have also lead to successful results for explaining the modification of current p

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