NEW PROPERTIES OF WIND WAVES FOUND BY MEANS OF A PROBABILISTIC APPROACH AND FIELD EXPERIMENTS

If we know that an exceptionally high wave occurs at a fixed point o in a wind wave field at an instant to, we can predict what happens, with a very high probability, an area surrounding o before and after to. The expression of the expected configuration of the water surface in that area is given in terms of the two-dimensional autocovariance of the random surface displacement, and the expression of the expected pressure fluctuation at a fixed depth is given in terms of the covariance of the random surface displacement and pressure fluctuation. An important feature of these expression is to hold for an arbitrary solid boundary and for nearly arbitrary bandwidth and spectrum shape. The author introduced this theory in the eighties. Then he executed a series of field experiments to test it. In these experiments the covariances were obtained directly from the time series data of an array of gauges. The results confirmed that the expected time histories are close to the actual time histories in the very high waves. Moreover, from an analysis of the expected time histories, which proved to be surprisingly smooth, it was found why the inertial wave force on a submerged cylinder is greater than the Froude-Krylov force.

  • 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 0-7918-1308-8. Vol II, p 1 [7 p, 8 ref, 4 fig]
  • Authors:
    • Boccotti, P
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00718744
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 27 1996 12:00AM