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Rogue Waves in Wind Seas: An Experimental Model in an Annular Wind-Wave Flume

[+] Author Affiliations
A. Toffoli

University of Melbourne, Parkville, Australia

D. Proment, H. Salman

University of East Anglia, Norwich, UK

J. Monbaliu

K.U. Leuven, Heverlee, Belgium

E. Stramignoni, R. Forza, M. Manfrin, M. Onorato

University of Turin, Torino, Italy

Paper No. OMAE2017-61156, pp. V03AT02A008; 7 pages
doi:10.1115/OMAE2017-61156
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3A: Structures, Safety and Reliability
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5765-6
  • Copyright © 2017 by ASME

abstract

The probability of occurrence of rogue waves in wind-generated fields is investigated experimentally in an annular wind-wave flume. Unlike many experiments on rogue waves, where waves are mechanically generated, here the wave field is forced naturally by wind as it is in the ocean. The peculiar geometry of the flume makes waves propagating circularly in an unlimited-fetch condition. Water surface elevation was measured at specific cross-sections under the effect of different wind speeds to monitor the temporal evolution of the wave field. Results show that the kurtosis of the surface elevation, the fourth order moment of the probability density function and a measure of the percentage of extremes in a wave record, gradually increases in time with the evolution of the wave field. Deviations from Normal statistics are observed to be a function of wind speed. The maximum departure from Normality resembled the one induced by quasi-resonant wave-wave interactions and it is observed at the final stage of wave growth and immediately before reaching the fully development regime.

Copyright © 2017 by ASME
Topics: Waves , Flumes , Wind , Seas , Wind waves

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