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Publicações
Gomes, D. e Guedes Soares, C. (1997), “Directionality Function Estimated with Maximum Entropy Methods”, Proceedings of the 16th International Conference on Offshore Mechanics and Arctic Engineering (OMAE’97), 1997, C. Guedes Soares, et al (Eds.), ASME, New York, Vol. II, pp. 9-17
The fast Fourier Transform (FFT), which is the classical technique for estimating the wave spectra, has some limitations, such as the low frequency resolution. This motivates the consideration of the Maximum Entropy (ME) method, which guarantees a higher frequency resolution. A comparative study is presented between the FFT and the ME methods in the estimation of the scalar spectrum of the sea surface elevation. A study of the directional spreading function, estimated by the two different methods, is also made. Next, some theoretical models of the directional spreading function are reviewed and are used to compare the different spreading functions obtained with the two referred estimating methods. Examples of the records measured with a directional buoy situated at Figueira da Foz, in Portugal, are shown to illustrate the application of the methods considered.
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