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Distribution of Wave Height Maxima in Storm Sea States

[+] Author Affiliations
Zhivelina Cherneva, C. Guedes Soares, Petya Petrova

Technical University of Lisbon, Lisbon, Portugal

Paper No. OMAE2008-58038, pp. 1025-1031; 7 pages
doi:10.1115/OMAE2008-58038
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 2: Structures, Safety and Reliability
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4819-7 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

The effect of the coefficient of kurtosis as a measure of the nonlinearity of third order on the distribution of the wave height maxima has been investigated. Measurements of the surface elevation during a storm at the North Alwyn platform in the North Sea have been used. The mean number of waves in the series is around 100. The maximum wave statistics have been compared with nonlinear theoretical distributions. It was found that the empirical probability densities of the maximum wave heights describe qualitatively the shift of the distribution mode towards higher values. The tendency for the peak of distribution to diminish with increase of the coefficient of kurtosis up to 0.6 is also clearly seen. However, the empirical peak remains higher than the theoretically predicted one. Exceedance probability of the maximum wave heights was also estimated from the data and was compared with the theory. For the highest coefficients of kurtosis nearly 0.6 the theoretical distribution approximates very well the empirical data. For lower coefficients of kurtosis the theory tends to overestimate the exceedance probability of the maximum wave heights.

Copyright © 2008 by ASME
Topics: Waves , Storms , Seas

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