Recently significant interest has been paid to abnormal waves, often called rogue waves or freak waves. These waves represent operational risks to ship and offshore structures, and are likely to be responsible for a number of accidents. As shown by several authors, in ‘the second order world’ the freak waves are pretty rare events. The present study focuses on statistical properties of freak waves. The analyses are based on second order time domain simulations, short term distributions for crest statistics obtained from the literature, and long term field data. Time series of wave elevations are generated using the Pierson-Moskowitz, JONSWAP and two-peak Torsethaugen frequency spectrum for long-crested seas and deep water. Effects of combined seas (swell and wind sea) on wave statistics are discussed. Assuming 2nd order wave theory, the short term and long term probability of occurrence of a freak wave is estimated. The difference between a “freak wave” and a “dangerous wave” is pointed out. Finally, 100 year and 10000 year crest events obtained by analysis procedures used in the offshore industry are discussed in relation to freak waves.
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ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
June 20–25, 2004
Vancouver, British Columbia, Canada
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3744-0
PROCEEDINGS PAPER
Freak Wave Events Within the Second Order Wave Model Available to Purchase
Elzbieta M. Bitner-Gregersen,
Elzbieta M. Bitner-Gregersen
Det Norske Veritas AS, Ho̸vik, Norway
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O̸istein Hagen
O̸istein Hagen
Det Norske Veritas AS, Ho̸vik, Norway
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Elzbieta M. Bitner-Gregersen
Det Norske Veritas AS, Ho̸vik, Norway
O̸istein Hagen
Det Norske Veritas AS, Ho̸vik, Norway
Paper No:
OMAE2004-51410, pp. 343-351; 9 pages
Published Online:
December 22, 2008
Citation
Bitner-Gregersen, EM, & Hagen, O. "Freak Wave Events Within the Second Order Wave Model." Proceedings of the ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 2. Vancouver, British Columbia, Canada. June 20–25, 2004. pp. 343-351. ASME. https://doi.org/10.1115/OMAE2004-51410
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