Modeling of the turbulence in the water column under breaking wind waves

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Title Modeling of the turbulence in the water column under breaking wind waves
Author Zhang, Hong; Chan, Eng-Soon
Journal Name Journal of Oceanography
Year Published 2003
Place of publication Netherlands
Publisher Springer
Abstract Past studies have shown that there is a wave-enhanced, near-surface mixed-layer in which the dissipation rate is greater than that derived from the “law of the wall”. In this study, turbulence in water columns under wind breaking waves is investigated numerically and analytically. Improved estimations of dissipation rate are parameterized as surface source of turbulent kinetic energy (TKE) for a more accurate modelling of vertical profile of velocity and TKE in the water column. The simulation results have been compared with the experimental results obtained by Cheung and Street (1988) and Kitaigorodskii et al. (1983), with good agreement. The results show that the numerical full model can well simulate the near-surface wave-enhanced layer and suggest that the vertical diffusive coefficients are highly empirical and related to the TKE diffusion, the shear production and the dissipation. Analytical solutions of TKE are also derived for near surface layer and in deep water respectively. Near the surface layer, the dissipation rate is assumed to be balanced by the TKE diffusion to obtain the analytical solution; however, the balance between the dissipation and the shear production is applied at the deep layer. The analytical results in various layers are compared with that of the full numerical model, which confirms that the wave-enhanced layer near the surface is a diffusion-dominated region. The influence of the wave energy factor is also examined, which increases the surface TKE flux with the wave development. Under this region, the water behavior transits to satisfy the classic law of the wall. Below the transition depth, the shear production dominantly balances the dissipation.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1023/A:1025567911110
Copyright Statement Copyright 2003 Springer-Verlag. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. The original publication is available at www.springerlink.com
Volume 59
Issue Number 3
Page from 331
Page to 341
ISSN 0916-8370
Date Accessioned 2006-07-11
Date Available 2010-08-26T07:37:28Z
Language en_AU
Research Centre Centre for Infrastructure Engineering and Management
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Physical Oceanography; PRE2009-Water and Sanitary Engineering
URI http://hdl.handle.net/10072/16694
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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