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Publications
Ewans, K.C., Bitner-Gregersen, E. and Guedes Soares, C. (2004) , “Estimation of Wind-Sea and Swell Components in a Bimodal Sea State”, Proceedings of the OMAE Specialty Conference on Integrity of Floating Production, Storage & Offloading (FPSO) Systems, ASME, New York, Paper OMAE-FPSO'04-0045
Integrated directional wave parameters are computed for the wind-sea and swell components in directional wave spectra. Accordingly, the mean direction and spreading are computed for each component of each spectrum in three data sets, corresponding to three quite disparate locations, a location offshore Norway, a location offshore Nigeria, and a location off the west coast of New Zealand. The wind-sea and swell components are derived by three different spectral partitioning methods. Two methods involve splitting frequency variance density spectra into two frequency bands the low-frequency band being swell and the high-frequency band being wind-sea. One of these two methods involves fitting the Torsethaugen spectral description to the components; the other involves fitting a JONSWAP spectrum to each of the components. The third method involves partitioning the full frequency-direction spectrum into a wind-sea and up to five swell components; both Gaussian and JONSWAP spectral shapes are fitted to the swell components and a JONSWAP function to the wind-sea components. A comparison of the directional parameters resulting from the three methods provides insight into the effect of partitioning method on the calculation of directional sea state parameters.
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