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Publications
Petrova, P. and 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 seas states of different non-linear probability distributions that have been developed for single sea states. It is based on data collected at an offshore basin. The measurements represent three bimodal sea states with the individual unidirectional wave systems propagating at 60º, 90º and 120º 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 curves (SSER) 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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