The Author discusses problems involving environmental forces and ship behaviour during manoeuvres in shallow water, together with some relevant research results from various sources. Among the aspects considered are:--current-induced drag forces; wave-induced forces and movements; ship inertia and its sensitivity to changes in water depth; effects of shallow water on manoeuvrability of large ships (some results from tests by the I.R.C.N on the 213,000-dwt Shell tanker Magdala are used to demonstrate these effects); heading stability; resistance, power, thrust, ship speed, rpm, and propulsive efficiency; stopping distance; squat and sinkage, including effects of initial trim, speed-induced sinkage, and wave-induced sinkage. A general conclusion drawn is that it is still not possible to give a clear answer to all the questions raised concerning shallow-water effects. Speed-induced sinkage can be calculated with some accuracy, but wave effects need further study. The results of hydrodynamic studies on shallow-water effects on manoeuvrability remain qualitative, and are far from complete; in this field in particular, the results should be confirmed and clarified by the seaman's experience. Order from BSRA as No. 52,162.

  • Supplemental Notes:
    • Proceedings of the First International Symposium on Ship Approach and Berthing Manoeuvres, Grenoble, Sept. 1977.
  • Corporate Authors:

    Intl Symp on Ship Approach & Berthing Manoeuvres

    Grenoble,   France 
  • Authors:
    • Sommet, J
  • Publication Date: 1977

Media Info

  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00308993
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Mar 31 1980 12:00AM