




Bennis, Anneclaire; Ardhuin, Fabrice; Dumas, Franck. 
Many theoretical approaches and implementations have been proposed for the coupling of the threedimensional ocean circulation with waves. The theoretical models are reviewed and it is shown that the formulation in terms of the quasiEulerian velocity circumvents the essential difficulty of alternative formulations for the Lagrangian mean velocity. Namely, models based on this Lagrangian velocity require an estimation of waveinduced motions to first order in the horizontal gradients of the wave field in order to estimate the vertical flux of wave pseudomomentum. So far, only threedimensional 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 
Palavraschave: Wavecurrent coupling; Radiation stresses; MARS3D; WAVEWATCH III. 
Ano: 2011 
URL: http://archimer.ifremer.fr/doc/00056/16705/14198.pdf 
 


Bennis, Anneclaire; Ardhuin, Fabrice. 
Equations for the waveaveraged threedimensional momentum equations have been published in this journal. It appears that these equations are not consistent with the known depthintegrated 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 quasiEulerian velocity, are better suited for threedimensional modeling of wave current interactions. 
Tipo: Text 

Ano: 2011 
URL: http://archimer.ifremer.fr/doc/00052/16297/13810.pdf 
 


Ardhuin, Fabrice; Roland, Aron; Dumas, Franck; Bennis, Anneclaire; 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... 
Tipo: Text 

Ano: 2012 
URL: http://archimer.ifremer.fr/doc/00130/24159/22254.pdf 
 

 


Bennis, Anneclaire; Dumas, Franck; Ardhuin, Fabrice; Blanke, Bruno. 
Wave setup is often underestimated by the models (e.g. Raubenheimer et al., 2001). Our paper discusses how the wave setup may be changed by the inclusion of turbulent mixing in the bottom shear stress. The parameterization developed in Mellor (2002) for phaseaveraged 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 nearbottom 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 phaseresolved velocities, but an overestimation of the turbulent phaseresolved velocities. Applying that parameterization to simulate... 
Tipo: Text 
Palavraschave: Bottom friction; Vertical mixing; Wave setup; Nearshore processes. 
Ano: 2014 
URL: http://archimer.ifremer.fr/doc/00188/29970/28482.pdf 
 


Bennis, Anneclaire; 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 gridspacing dependent horizontal mixing on the wavecurrent 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 gridspacing 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 
Palavraschave: Numerical modeling; Rip currents; Turbulence modeling; Wavecurrent interactions. 
Ano: 2015 
URL: https://archimer.ifremer.fr/doc/00601/71288/69695.pdf 
 


