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Publications
Rusu, L., Bernardino, M. and Guedes Soares, C. (2008), “Influence of the Wind Fields on the Accuracy of Numerical Wave Modelling in Offshore Locations”, Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering (OMAE´08), 15-20 June, 2008, Estoril, Portugal, ASME, New York, Paper OMAE2008-57861
The present study aims to provide valuable information concerning the influence of the wind field resolution in the accuracy of the wave predictions when using spectral numerical models in highly non stationary situations. The main area of interest is the port of Sines, located in the Portuguese continental coastal environment south of Lisbon. The SWAN based model was forced with wind fields simulated by different models and with different resolutions. A wave rider type directional buoy located offshore the Sines port at approximately 100 meters water depth was used as check point. In a first approach, two different wind fields simulated by REMO and MM5 were considered for forcing the SWAN based transformation module. Both wind fields have a spatial resolution of 0.5 degrees and were obtained using the global NCEP reanalysis data as wind driver. Initial wave boundary conditions are provided by WAM simulations for the entire North Atlantic basin. Afterwards, three successive SWAN areas were implemented. The three spatial resolutions defined for these SWAN computational domains were 0.05, 0.02 and 0.005 degrees, respectively. In a second approach, the resolution of the MM5 wind model system was gradually increased in the computational domains considered for the SWAN simulations and various tests were carried out. Simulations were performed from the beginning of December 2000 till the end of February 2001, which is in fact one of the most energetic periods registered close to this coast and the results in terms of significant wave height, mean period and wave direction were compared with the in situ measured data.
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