Research Article
May 1974
Speed of Ships in Restricted Navigation Channels
Publication: Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 100, Issue 2
Abstract
Ship model experiments confirm that orthodox screw-driven craft attain an apparent maximum or barrier speed in navigation channels of restricted width and depth, irrespective of available engine power. This speed is primarily a function of blockage ratio (the relationship between cross-sectional area of the ship to that of the channel). It occurs when conditions alongside become critical at the maximum section; discharge onto the screw is thereby controlled and ship speed becomes limiting. A direct hydraulic jump develops near the stern. A bow-screw arrangement permits acceleration beyond the limiting speed since free flow onto the screw is no longer prevented by critical conditions which now occur downstream. Factors studied during experimentation include ship squat, thrust, power, screw revolutions, water-surface profiles, and water velocities. A two-dimensional theory demonstrates the development of critical conditions around the ship.
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Published In
Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 100 • Issue 2 • May 1974
Pages: 133 - 150
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: May 1974
Published online: Feb 12, 2021
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Authors
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R. Bryan Schofield
Sr. Leet. in Civ. Engrg., Univ. of Salford, Salford, United Kingdom
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