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Verification of Quasi-Determinism theory against Baltic Sea Data

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Języki publikacji
EN
Abstrakty
EN
The second formulation of Boccotti’s quasi-determinism theory is investigated. Deep water wave records collected in the Baltic Sea with AWAC (Nortek Acoustic Wave and Current profiler) are used in this study. The adequacy of Boccotti’s theory for Baltic Sea conditions is evaluated on the basis of some simulations of wave groups with a very large maximum wave height. The large waves are chosen using an abnormality index (ratio of maximum wave height to significant wave height) with a value greater than 2. Such values of this index are also used by different authors for the definition of freak waves. In order to obtain better results, JONSWAP formula is fitted to the measured spectra instead of using default JONSWAP parameters for the simulations. Verification of values of spectral parameters obtained from the autocovariance function against the same parameters calculated from smoothed and not smoothed spectra is presented. Much attention is given to spectral peak period value. The spectral width parameter, in QD theory known as narrow bandedness parameter, requires further investigation as the results obtained here did not allow the formulating of any functional relation with another – more often used – spectral width parameter. The low frequency of sampling of the data allowed only the most important aspects of the theory to be checked. A short Matlab function used in QD simulations is presented.
Twórcy
autor
  • Institute of Meteorology and Water Management - National Research Institute, Podleśna 61, 01-673 Warsaw, Poland, ewa.antao@imgw.pl
Bibliografia
  • Antão E., Arena F., Guedes Soares C., Romolo A., 2009, Steepness of high ocean waves in Quasi-Determinism theory, ASME Proceedings, Paper No. OMAE2009-79876, 597-604, DOI: 10.1115/OMAE2009-79876
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  • Antão E., Guedes Soares C., 2016, Approximation of the joint probability density of wave steepness and height with a bivariate gamma distribution, Ocean Engineering, 126, 402-410, DOI: 10.1016/j.oceaneng.2016.09.015
  • Arena F., 2005, On non-linear very large sea wave groups, Ocean Engineering, 32 (12), 1311-1331, DOI: 10.1016/j.oceaneng.2004.12.002
  • Arena F., Ascanelli A., Nava V., Pavone D., Romolo A., 2008, Three-dimensional nonlinear random wave groups in intermediate water depth, Coastal Engineering, 55 (12), 1052-1061, DOI: 10.1016/j.coastaleng.2008.04.002
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  • Boccotti P., 2000, Wave mechanics for ocean engineering, vol. 64, Elsevier Science, Oxford, 520 p.
  • Guedes Soares C., Antão E., 2004, Comparison of the characteristics of abnormal waves on the North Sea and Gulf of Mexico, [in:] Rogue Waves 2004: Proceedings of a Workshop Organized by Ifremer and Held in Brest, France, 20-22 October, M. Olagnon, M. Prevosto (eds.), Editions Quae.
  • Guedes Soares C., Cherneva Z., Antão E., 2003, Characteristics of abnormal waves in North Sea storm sea states, Applied Ocean Research, 25 (6), 337-344, DOI: 10.1016/j. apor.2004.02.005
  • Guedes Soares C., Cherneva Z., Antão E., 2004a, Steepness and asymmetry of the largest waves in storm sea states, Ocean Engineering, 31 (8-9), 1147-1167, DOI: 10.1016/j.oceaneng.2003.10.014
  • Guedes Soares C., Cherneva Z., Antão E., 2004b, Abnormal waves during Hurricane Camille, Journal of Geophysical Research, 109 (C8), DOI: 10.1029/2003JC002244
  • Guedes Soares C., Pascoal R., Antão E., Voogt A., Buchner B., 2007, An approach to calculate the probability of wave impact on an FPSO bow, Journal of Offshore Mechanics and Arctic Engineering, 129 (2), 73-80, DOI: 10.1115/1.2426983
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Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-199ebe6d-7e9f-46cc-9b6d-a5b4599336b4
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