Publicações

Cherneva, Z., Guedes Soares, C. and Petrova, P.G. (2008), “Maximum Wave Crest and Height Statistics of Irregular and Abnormal Waves in an Offshore Basin”, Proceedings of the 3rd International Workshop on Applied Offshore Hydrodynamics, 17-19 Outubro, Rio de Janeiro, Brasil

Irregular deep water sea states generated in a tank and represented by a JONSWAP spectrum have been investigated with respect to the statistics of the largest waves. The crests and heights of the maximum observed waves have been fitted by linear and second order statistical models. Special attention has been given to the extreme waves, which fulfil simultaneously the criteria for the crest and height abnormality indices. Statistically, the non-Gaussian behaviour of the considered wave fields has been demonstrated by means of the coefficients of skewness and kurtosis estimated from the time series. The estimates have been compared with second order theory. Moreover, analytical formulae, taking into account the effects of spectral bandwidth and finite depth, have been applied to improve the predictions for the normalized cumulants. The obtained results showed that the largest crests are well described by the models with correction of third order included, by means of the coefficient of kurtosis.

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