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Grupo de Ambiente Marinho > 1.2 Modelos Probabilísticos de Parâmetros da Agitação Marítima > Publicações
Petrova, P. e Guedes Soares, C. (2009), “Probability Distributions of Wave Heights in Bimodal Seas Generated in an Offshore Basin”, Applied Ocean Research, Vol. 31, pp. 90-100
This study aims at assessing the adequacy for describing bimodal sea states of different non-linear
probability distributions that have been developed for single sea states. It is based on data collected at an
offshore test basin. The measurements represent three bimodal sea states with individual unidirectional
wave systems propagating at 60, 90 and 120 from each other. The wave spectra are separated into
swell and wind sea components and the relative energy ratio between the areas under the associated
spectral curves is estimated and is related with the statistics of the time series considered. Dependence
is found between the normalized high order cumulants, which describe the non-Gaussian surface, and
the predominant contribution of the wind sea energy. Furthermore, the probabilities of exceedance of
the individual wave heights are estimated and compared with the Rayleigh model and with other models
that take into account either the effect of spectral bandwidth or the effect of wave nonlinearities. The
results are discussed with respect to three classes of sea states that reflect the relative contribution of
swell and wind sea energy.
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