IRREGULAR, NON-LINEAR WAVES IN A SPREAD SEA

Optimal design and re-assessment of offshore structures requires a good understanding of the ocean environment. The motion of the sea surface can be viewed as a three-dimensional, non-linear stochastic process. In order to characterise the wave environment adequately, it is necessary to model its random, non- linear and spread nature. This paper addresses: the expected shape of a linear wave near a crest or trough; the expected shape of the linear ocean surface at one point, given a crest at a different point; an efficient method to incorporate non-linear effects within linear wave simulations; the distributions of crests and troughs for observed and simulated non-linear waves; and the magnitude of wave non- linearity as a function of wave amplitude. Detailed comparison of theory and full-scale offshore measurements at an offshore platform show good agreement. In particular, the average shape of large waves is consistent with the New Wave theory of Tromans et al (1991), after allowing for second-order non-linearity. Results validate the application of New Wave for structural design and re- assessment.

  • Supplemental Notes:
    • OMAE 1995, 14th Intl Conf on Offshore Mechanics & Arctic Engng; 18-22 June 1995; Copenhagen, Denmark. Sponsored by ASME et al. Procs. Publ by ASME, ISBN 0-7918-1306-1. Vol I, Pt A, p 9 [8 p, 12 ref, 6 fig]
  • Authors:
    • Jonathan, P
    • Taylor, P H
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717680
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM