Multiple-Pit Breakwaters
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 122, Issue 1
Abstract
Linearized shallow-water wave theory is used to investigate the interaction of surface waves with multiple rectangular submarine pits in water of otherwise uniform depth. The solution is obtained by a boundary element technique using a two-dimensional Green's function. It is shown that appropriate selection of pit dimensions and placement may lead to a significant reduction in wave heights behind these structures. Numerical results have been presented that illustrate the influence of the various pit characteristics on the diffracted wave field. Two pits can provide a shadow region in which wave heights are reduced to 10–20% of the incident wave height. The shadow region, with wave heights reduced to 30% of the incident wave height, is approximately the width of the pits and five wavelengths long. Guidance is given on how to select pit geometries and placement for optimal breakwater performance. An example is also presented that shows how to select a pit to reduce wave heights in a navigation channel.
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References
1.
Furukawa, K. (1991). “Wave diffraction due to trenches and rubble,” MSc thesis, Dept. of Civ. Engrg., Oregon State University, Corvallis, Oreg.
2.
Kirby, J. T., and Dalrymple, R. A.(1983). “Propagation of obliquely incident water waves over a trench.”J. Fluid Mech., 133, 47–63.
3.
Lee, J. J.(1971). “Wave-induced oscillations in harbours of arbitrary geometry.”J. Fluid Mech., 45, 375–394.
4.
Lee, J. J., and Ayer, R. M.(1981). “Wave propagation over a rectangular trench.”J. Fluid Mech., 110, 335–347.
5.
Stoker, J. J. (1957). Water waves: The mathematical theory with applications . Wiley-Interscience, New York, N.Y.
6.
Williams, A. N.(1990). “Diffraction of long waves by a rectangular pit.”J. Wtrwy., Port, Coast., and Oc. Engrg., ASCE, 116, 459–469.
7.
Williams, A. N., and Vazquez, J. H.(1991). “Wave interaction with a rectangular pit.”J. Offshore Mech. and Arctic Engrg., 113, 193–198.
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Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jan 1, 1996
Published in print: Jan 1996
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