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MOORED SHIPS EXPOSED TO COMBINED WAVES AND CURRENT

This paper presents information on the behaviour of moored ships under the combined action of waves and current. This information was developed mainly through a program of hydraulic model testing, conducted as a part of engineering studies for a proposed oil terminal in the Bay of Fundy, in which the effect of strong tidal currents and waves from the open Atlantic, to which the site was exposed, were realistically simulated. The mooring lines on the ships and the fenders were modelled to incorporate their non-linearities, and the site wave records were used to develop the wave excitation in the model basin. The results showed that the combined action of waves and current was not just the sum of the separate effects but a complex relationship dependent upon wave spectra, wave periods and current direction. For currents running nearly head or stern on, the yaw motions of the ship were amplified compared to wave action alone. For currents at an angle to the ship, all mooring forces and ship motions could be strongly amplified compared to wave action alone. For the particular site considered, the analyses and model tests pointed to the use of a medium soft mooring system (wires with nylon tails and compatible fenders) as the best means of simultaneously minimizing the ship motions and the mooring line forces.

  • Supplemental Notes:
    • Proceedings of the 4th International Conference on Port and Ocean Engineering under Arctic Conditions (POAC 77), Newfoundland Memorial University, Canada, September 26-30, 1977.
  • Corporate Authors:

    POAC Conference 77

    ,    
  • Authors:
    • Khanna, J
    • Ottesen-Hansen, N E
  • Publication Date: 1977

Media Info

  • Features: References;
  • Pagination: 11 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00167689
  • Record Type: Publication
  • Source Agency: Memorial University of Newfoundland, Canada
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Jan 13 1978 12:00AM