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Provedor de dados:  ArchiMer
País:  France
Título:  Mixing parameterization: Impacts on rip currents and wave set-up
Autores:  Bennis, Anne-claire
Dumas, Franck
Ardhuin, Fabrice
Blanke, Bruno
Data:  2014-07
Ano:  2014
Palavras-chave:  Bottom friction
Vertical mixing
Wave set-up
Nearshore processes
Resumo:  Wave set-up is often underestimated by the models (e.g. Raubenheimer et al., 2001). Our paper discusses how the wave set-up may be changed by the inclusion of turbulent mixing in the bottom shear stress. The parameterization developed in Mellor (2002) for phase-averaged oscillatory boundary layer is used for this purpose. Two studies are carried out. The dependence of the parameterization on the vertical discretization and on the magnitude of the near-bottom wave orbital velocity is investigated. The function that distributes the turbulent terms over the vertical is modified, giving a good agreement with the average of the phase-resolved velocities, but an overestimation of the turbulent phase-resolved velocities. Applying that parameterization to simulate laboratory conditions in the presence of rip currents gives accurate magnitudes of the rip velocity, particularly in a fully coupled wave–current configuration, with an RMS error of about 4%. Compared to a model using the more standard Soulsby (1995) parameterization, the wave set-up is increased by about 12% when using the alternative parameterization. Thus the bottom shear stress is sensitive to the mixing parameterization with a possible effect of turbulence on the wave set-up. Further measurement and parameterization efforts are necessary for practical applications.
Tipo:  Text
Idioma:  Inglês

Editor:  Pergamon-elsevier Science Ltd
Formato:  application/pdf
Fonte:  Ocean Engineering (0029-8018) (Pergamon-elsevier Science Ltd), 2014-07 , Vol. 84 , P. 213-227
Direitos:  2014 Elsevier Ltd. All rights reserved.


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