Publicações

Veltcheva, A. e Guedes Soares, C. (2016), “Analysis of Wave groups by the Hilbert Huang Transform method”, Applied Ocean Research, Vol. 60, pp. 176-184

The group structure of wave records, containing abnormal waves, is studied by conventional methods for wave data analysis and by the non-stationary Hilbert Huang Transform method. Instantaneous quantities, such as envelope, phase and frequency, are used to examine the local wave characteristics. A refined definition of wave group is proposed based on consideration that wave process is simultaneously amplitude and phase modulated. The Hilbert spectrum is used as a detector of wave groups and time group length and group energy are determined from it. It was found that the symmetrical abnormal waves appear in a record with pronounced groupiness.

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