On Irregular, Nonlinear Waves in a Spread Sea

[+] Author and Article Information
P. Jonathan, P. H. Taylor

Shell Research B.V., P.O. Box 60, 2280 AB Rijswijk ZH, The Netherlands

J. Offshore Mech. Arct. Eng 119(1), 37-41 (Feb 01, 1997) (5 pages) doi:10.1115/1.2829043 History: Received January 01, 1995; Revised September 25, 1996; Online December 17, 2007


Optimal design and reassessment of offshore structures requires a good understanding of the ocean environment. The motion of the sea surface can be viewed as a three-dimensional, nonlinear stochastic process in time. In order to characterize the wave environment adequately, we need to model its random, nonlinear, and spread nature. In this paper, we address: • the expected shape of a wave near a crest or trough, • the expected shape of the ocean surface at one point, given a crest at a different point, • an efficient method to incorporate nonlinear effects within linear wave simulations, • the magnitude of wave nonlinearity as a function of wave amplitude. Detailed comparison of theory and full-scale offshore measurements at the Shell Expro Tern platform show good agreement.

Copyright © 1997 by The American Society of Mechanical Engineers
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