MANOEUVRING IN SHALLOW WATER: HYDRODYNAMIC ASPECTS--RESEARCH RESULTS
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.
- Proceedings of the First International Symposium on Ship Approach and Berthing Manoeuvres, Grenoble, Sept. 1977.
Intl Symp on Ship Approach & Berthing ManoeuvresGrenoble, France
- Sommet, J
- Publication Date: 1977
- Pagination: 10 p.
- TRT Terms: Drag forces; Engine efficiency; Fluid resistance; Force; Hydrodynamic pressure; Maneuvering; Navigation; Ocean currents; Propulsion; Ship motion; Ship pilotage; Ships; Waves
- Uncontrolled Terms: Sinkage; Wave forces
- Old TRIS Terms: Course stability; Current forces; Hydrodynamic forces; Propulsive efficiency; Shallow water effects; Shallow water maneuvering
- Subject Areas: Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;
- 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