Shallow Wave Diffraction around Large Cylinder

by Michael de St.Q. Isaacson, Asst. Prof.; Dept. of Civ. Engrg., Univ. of British Columbia, Vancouver, B.C., Canada; formerly, Postdoct. Research Assoc., Joint Tsunami Research Effort, National Oceanic and Atmospheric Administration, Honolulu, Hawaii,

Serial Information: Journal of the Waterway, Port, Coastal and Ocean Division, 1977, Vol. 103, Issue 1, Pg. 69-82

Document Type: Journal Paper


The diffraction of cnoidal waves around a large vertical circular cylinder is investigated. First approximations are derived for the velocity potential of the flow field and consequently for the wave loading on the cylinder. The forces may be appreciably larger than predicted on the basis of shallow water sinusoidal wave theory, and the consequences on the design of large offshore structures in shallow water are assessed. The possibility of extending the theory to a second approximation is examined.

Subject Headings: Wave diffraction | Cylinders | Approximation methods | Wave velocity | Shallow water | Water waves | Offshore structures | Potential flow

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