26 Jun 2023
 | 26 Jun 2023

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

Gaetano Porcile, Anne-Claire Bennis, Martial Boutet, Sophie Le Bot, Franck Dumas, and Swen Jullien

Abstract. 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 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 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, and waves on the circulation of coastal seas with implications to the study of air-sea interactions and sediment transport processes.

Gaetano Porcile et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-715', Anonymous Referee #1, 20 Jul 2023
  • RC2: 'Comment on egusphere-2023-715', Anonymous Referee #2, 01 Aug 2023
  • CC1: 'Comment on egusphere-2023-715', Chu-En Hsu, 02 Aug 2023

Gaetano Porcile et al.

Data sets

Bay of Somme coupled CROCO (v1.2) - WAVEWATCH-III (v6.07) configuration files used in Porcile et al. (2023) Gaetano Porcile, Anne-Claire Bennis, Martial Boutet ,Sophie Le Bot, Franck Dumas, and Swen Jullien

Model code and software

Bay of Somme coupled CROCO (v1.2) - WAVEWATCH-III (v6.07) configuration files used in Porcile et al. (2023) Gaetano Porcile, Anne-Claire Bennis, Martial Boutet ,Sophie Le Bot, Franck Dumas, and Swen Jullien

Gaetano Porcile et al.


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Short summary
Here a new method of modeling the interaction between ocean currents and waves is presented. We developed an advanced coupling of two models, one for ocean circulation and one for waves. In previous couplings, some wave-related calculations were based on simplified assumptions. Our method uses more complex calculations to better represent wave-current interactions. We tested it in a macro-tidal coastal area and found that it significantly improves the model accuracy, especially during storms.