Grupo de Ambiente Marinho > 1.1 Modelos espectrais e modelos de séries temporais da Agitação Marítima > Publicações

Antão, E., Arena, F., Guedes Soares, C. e Romolo, A. (2009), “Steepness of High Ocean Waves in Quasi-Deterministic Theory”, Proceedings of the 28th International Conference on Ocean, Offshore and Arctic Engineering (OMAE´09), 31 May-5 June, Honolulu, Hawaii, USA, ASME, New York

This paper investigates the steepness of high ocean waves. Different steepness and asymmetry parameters of the highest wave in a time series recorded in severe storms as well as nonlinearity of the records were investigated in Guedes Soares et al (2003, 2004). Here the steepness of high waves will be investigated by considering the ocean wave groups, either to the first and to the second order in a Stokes expansion, and some conclusions are validated with wave data generated in an offshore basin. In particular, some parameters of wave steepness defined in Guedes Soares et al. (2004) are obtained with an analytical approach, by starting from the Boccotti’s linear Quasi-Determinism theory, including the second-order component achieved by Arena (2005; see also Fedele & Arena, 2005, Arena et al. 2008) for wave groups in undisturbed wave field. Furthermore, the wave field is analyzed in the space domain, to determine the actual steepness of highest waves. These results, achieved starting from either the time or the space domain, will be analyzed for different wave spectra.

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