Implementation of additional spectral wave field exchanges in a 3D wave-current coupled WAVEWATCH-III (version 6.07) - CROCO (version 1.2) configuration and assessment of their implications for macro-tidal coastal hydrodynamics

. An advanced coupling between a three-dimensional ocean circulation model (CROCO) and a spectral wave model (WAVEWATCH-III) is presented to better represent wave-current interactions in coastal areas. In the previous implementation of the coupled interface between these two models, some of the wave-induced terms in the ocean dynamic equations were computed from their monochromatic approximations (e.g., Stokes drift, Bernoulli head, near-bottom wave orbital velocity, wave-to-ocean energy flux). In the present study the exchanges of these fields computed from the spectral wave model are 5 implemented and evaluated. A set of numerical experiments for a coastal configuration of the circulation near the Bay of Somme (France) is designed. The impact of the spectral versus monochromatic computation of wave-induced terms significantly affects the hydrodynamics at coastal scale in the case of storm waves and winds opposed to tidal flows, reducing the wave-induced deceleration of the vertical profile of tidal currents. This new implementation provides current magnitudes closer to measurements than those predicted using their monochromatic formulations, particularly at the free surface. The spectral 10 surface Stokes drift and the near-bottom wave orbital velocity are found to be the most impacting spectral fields, respectively increasing advection towards the free surface and shifting the profile close to the seabed. In the particular case of the Bay of Somme, the approximation of these spectral terms with their monochromatic counterparts ultimately results in an underestimation of ocean surface currents. Our model developments thus provide a better description of the competing effects of tides, winds

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