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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

WIND-WAVE SURFACE TURBULENCE AND LANGMUIR CIRCULATIONS ON THE UPPER MIXED LAYER OF MARINE ECOSYSTEMS

Mahmoud Moussa
Laboratoire hydraulique, Ecole Nationale d'lngénieurs de Tunis BP. 37, le Belvédere, 1002 Tunis, Tunisia

Philippe Maurel
Institut de Mécanique des Fluides de Toulouse, UMR 5502 Allée Camille Soula, 31400 Toulouse, France

Lucien Masbernat
Institut de Mecanique des Fluides de Toulouse, France

Abstract

We present an experimental and numerical analysis of wind-generated currents and turbulence in the sea surface layer. We examine laboratory and field data in order to define a new characterization of the turbulent scales at the interface. The numerical study concerns the development of 2-D vertical model, formulated in (U, Ψ, Ω, k, ε) variables. This model allows to predict the average and turbulent kinematics fields and takes into account the wave-current-turbulence interactions that maintain the Langmuir circulation and increase the turbulence level under wind waves.