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Comments on "The Depth-Dependent Current and Wave Interaction Equations: A Revision" ArchiMer
Bennis, Anne-claire; Ardhuin, Fabrice.
Equations for the wave-averaged three-dimensional momentum equations have been published in this journal. It appears that these equations are not consistent with the known depth-integrated momentum balance, especially over a sloping bottom. These equations should thus be considered with caution, because they can produce erroneous flows, particularly outside of the surf zone. It is suggested that the inconsistency in the equations may arise from the different averaging operators applied to the different terms of the momentum equation. It is concluded that other forms of the momentum equations, expressed in terms of the quasi-Eulerian velocity, are better suited for three-dimensional modeling of wave current interactions.
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00052/16297/13810.pdf
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Mixing parameterization: Impacts on rip currents and wave set-up ArchiMer
Bennis, Anne-claire; Dumas, Franck; Ardhuin, Fabrice; Blanke, Bruno.
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...
Tipo: Text Palavras-chave: Bottom friction; Vertical mixing; Wave set-up; Nearshore processes.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00188/29970/28482.pdf
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Numerical Wave Modeling in Conditions with Strong Currents: Dissipation, Refraction, and Relative Wind ArchiMer
Ardhuin, Fabrice; Roland, Aron; Dumas, Franck; Bennis, Anne-claire; Sentchev, Alexei; Forget, Philippe; Wolf, Judith; Girard, Francoise; Osuna, Pedro; Benoit, Michel.
Currents effects on waves have led to many developments in numerical wave modeling over the past two decades, from numerical choices to parameterizations. The performance of numerical models in conditions with strong currents is reviewed here, and observed strong effects of opposed currents and modulations of wave heights by tidal currents in several typical situations are interpreted. For current variations on small scales, the rapid steepening of the waves enhances wave breaking. Using different parameterizations with a dissipation rate proportional to some measure of the wave steepness to the fourth power, the results are very different, none being fully satisfactory, which points to the need for more measurements and further refinements of...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00130/24159/22254.pdf
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On the coupling of wave and three-dimensional circulation models: Choice of theoretical framework, practical implementation and adiabatic tests ArchiMer
Bennis, Anne-claire; Ardhuin, Fabrice; Dumas, Franck.
Many theoretical approaches and implementations have been proposed for the coupling of the three-dimensional ocean circulation with waves. The theoretical models are reviewed and it is shown that the formulation in terms of the quasi-Eulerian velocity circumvents the essential difficulty of alternative formulations for the Lagrangian mean velocity. Namely, models based on this Lagrangian velocity require an estimation of wave-induced motions to first order in the horizontal gradients of the wave field in order to estimate the vertical flux of wave pseudo-momentum. So far, only three-dimensional wave models have been able to provide these estimates, and all published theories based on the simpler Airy theory are not consistent at the leading order, because...
Tipo: Text Palavras-chave: Wave-current coupling; Radiation stresses; MARS3D; WAVEWATCH III.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00056/16705/14198.pdf
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Turbulence Modeling and Wave-Current Interactions ArchiMer
Bennis, Anne-claire; Dumas, Franck; Ardhuin, Fabrice; Blanke, Bruno.
The mechanics of rip currents are complex, involving interactions between waves, currents, water levels and the bathymetry, that present particular challenges for numerical models. Here, the effects of a grid-spacing dependent horizontal mixing on the wave-current interactions are studied. Near the shore, wave rays diverge from channels towards bar crests because of refraction by topography and currents, in a way that depends on the rip current intensity which is itself modulated by the horizontal mixing. At low resolution with the grid-spacing dependent horizontal mixing, the wave motion is the same for both coupling modes because the wave deviation by the currents is weak. In high resolution case, however, classical results are found with the stabilizing...
Tipo: Text Palavras-chave: Numerical modeling; Rip currents; Turbulence modeling; Wave-current interactions.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00601/71288/69695.pdf
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Un nouveau modèle couplé vagues-courant 3D : développement et validation ArchiMer
Bennis, Anne-claire; Ardhuin, Fabrice; Odaka, Tina; Dumas, Franck.
A numerical model coupling the three-dimensional oceanic circulation, thanks to the MARS3D model, and the sea state computed by the WAVEWATCH III model, is developed in order to study the hydrodynamic of the nearshore zone. The main principle of the coupled model based on the coupler PALM and the necessary modifications made for the coupling procedure to both numerical codes are described. First tests in horizontal two-dimension are made and they allowed us to develop a primary version. For three-dimensional flow, we show that the coupled model must solve the quasi-Eulerian velocity. In fact, a coherent analytical form of the wave forcing for the Lagrangian velocity does not exist. This point is illustrated by one example with large errors in comparison...
Tipo: Text Palavras-chave: Modélisation couplée; Circulation côtière; MARS3D; WAVEWATCH III.; Wave-current modeling; Nearshore zone; MARS3D; WAVEWATCH III.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00286/39707/38162.pdf
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