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Generation of Freak Wave in Non-Uniform Current

[+] Author Affiliations
I. V. Lavrenov

Arctic and Antarctic Research Institute, St. Petersburg, Russia

Paper No. OMAE2002-28572, pp. 643-650; 8 pages
doi:10.1115/OMAE2002-28572
From:
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 2
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3612-6 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME

abstract

Accident of freak wave collision with a ship in the Agulhas current is described with appropriate weather conditions and non-uniform current speed distribution. Satellite observation shows an essential wave height enlargements in the current. Using a spectral mathematical model this fact is explained as a result of wind wave and current interaction. Thus, the appearance of freak wave is explained as a result of wind wave transformation in the Agulhas current. Swell is captured and intensified by the counter-current and is directed into the region of the maximum value of the current velocity, as a result there is a great concentration of the wave energy density. The superposition of wind sea with swell transformed by the current promotes formation of the freak waves.

Copyright © 2002 by ASME
Topics: Waves

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