Estudo de casos de ondas no Atlântico Sul através de modelagem numérica

Abstract

A study of two cases of ocean waves generated by wind in South Atlantic ocean is performed through the application of a wave model, forced by wind data produced by ECMWF, being the results compared with data measured by an oceanographic buoy located at Campos basin, Rio de Janeiro coastal region.Two cases were selected. First, a swell, with peak period of 18 seconds generated at south Argentina’s coast. The second, a local sea from NE with 3,5 m of significative height, at Campos basin.A brief revision of wave models found in literature is carried out, as well as a characterization of sea state at South Atlantic, with emphasis in the region where comparison data were collected.The wave model can be classified as a second generation coupled discrete model and includes advection, refraction, shoaling, bottom friction and wave breaking dissipation and conservative non-linear interactions parameterized by a quasi-equilibrium spectral distribution. A change in the period discretization was suggested to improve its results.The simulations showed that the model could reproduce the situations studied, although some difficulties related to the coarse wind fields resolution were found.