# Changeset 11315 for NEMO/branches/2019/dev_r11233_obsasm_docfixes/doc/latex/NEMO/subfiles/chap_ZDF.tex

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Timestamp:
2019-07-19T19:12:23+02:00 (20 months ago)
Message:

#2297 Merge in the latest trunk

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 r11225 \label{subsec:ZDF_swm} TBC ... Surface waves produce an enhanced mixing through wave-turbulence interaction. In addition to breaking waves induced turbulence (\autoref{subsec:ZDF_tke}), the influence of non-breaking waves can be accounted introducing wave-induced viscosity and diffusivity as a function of the wave number spectrum. Following \citet{qiao.yuan.ea_OD10}, a formulation of wave-induced mixing coefficient is provided  as a function of wave amplitude, Stokes Drift and wave-number: \label{eq:Bv} B_{v} = \alpha {A} {U}_{st} {exp(3kz)} Where $B_{v}$ is the wave-induced mixing coefficient, $A$ is the wave amplitude, ${U}_{st}$ is the Stokes Drift velocity, $k$ is the wave number and $\alpha$ is a constant which should be determined by observations or numerical experiments and is set to be 1. The coefficient $B_{v}$ is then directly added to the vertical viscosity and diffusivity coefficients. In order to account for this contribution set: \forcode{ln_zdfswm = .true.}, then wave interaction has to be activated through \forcode{ln_wave = .true.}, the Stokes Drift can be evaluated by setting \forcode{ln_sdw = .true.} (see \autoref{subsec:SBC_wave_sdw}) and the needed wave fields can be provided either in forcing or coupled mode (for more information on wave parameters and settings see \autoref{sec:SBC_wave}) % ================================================================