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How Quartet Resonance Might or Might Not Amplify Large Waves Into Freak Waves

[+] Author Affiliations
Peter Tromans

Ocean Wave Engineering Ltd., Liss, Hampshire, UK

Paper No. OMAE2011-49982, pp. 729-736; 8 pages
doi:10.1115/OMAE2011-49982
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 2: Structures, Safety and Reliability
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4434-2
  • Copyright © 2011 by ASME

abstract

We have developed an approximate solution to Zakharov’s equations for the evolution of ocean surface waves. We have applied it with a spectral response surface method to estimate the probability of exceedance of crest elevation in random seas. The method avoids time-marching and allows probabilities to be estimated on practical time scales. The results indicate that quartet resonance can produce very large amplification of extreme crests in uni-directional seas. However, the effect is very much smaller in spread seas. Although the solution is approximate it provides a great deal of physical insight into the mechanisms by which a freak wave might develop and explains the difference in results between uni-directional and spread seas.

Copyright © 2011 by ASME
Topics: Resonance , Waves

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