Assessment of the importance of the current-wave coupling in the shelf ocean forecastsReport as inadecuate

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1 Institut Mediterrani d-Estudis Avanats 2 Laboratori d-Enginyeria Martima

Abstract : The effects of wave-current interactions on shelf ocean forecasts is investigated in the framework of the MFSTEP Mediterranean Forecasting System Project Towards Enviromental Predictions project. A one way sequential coupling approach is adopted to link the wave model WAM to the circulation model SYMPHONIE. The coupling of waves and currents has been done considering four main processes: wave refraction due to currents, surface wind drag and bo?ttom drag modifications due to waves, and the wave induced mass flux. The coupled modelling system is implemented in the southern Catalan shelf NW Mediterranean, a region with characteristics similar to most of the Mediterranean shelves. The sensitivity experiments are run in a typical operational configuration. The wave refraction by currents seems to be not very relevant in a microtidal context such as the western Mediterranean. The main effect of waves on current forecasts is through the modification of the wind drag. The Stokes drift also plays a significant role due to its spatial and temporal characteristics. Finally, the enhanced bottom friction is just noticeable in the inner shelf.

Author: G. Jordü - R. Bolaños - M. Espino - A. Sánchez-Arcilla -



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