TECHNICAL NOTES
Nov 1, 1995

Wave Transmission by Suspended Pipe Breakwater

Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 121, Issue 6

Abstract

A suspended pipe breakwater was designed specifically for fishery/pleasure-craft harbors where moderate wave agitations in the harbor basin are admissible. The present breakwater consists of a row of closely spaced pipes mounted onto a frame and suspended between the support piles spaced far apart. Experimental studies conducted to determine the wave transmission characteristics indicate that by suspending a row of closely spaced pipes (with a gap to diameter ratio of 0.22 and draft to water depth ratio of 0.46), a 50% reduction in incident-wave height can be achieved. The cost and performance of conventionally adopted pile breakwater (involving a row of closely spaced piles driven on the seabed) were compared with the present system. The comparison revealed that the present system can reduce the investment cost by about 40% and can attenuate waves with the same efficiency as that of a row of closely spaced piles.

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References

1.
Grune, J., and Kohlhase, S. (1974). “Wave transmission through vertical slotted walls.”14th Coast. Engrg. Conf., ASCE, New York, N.Y., Vol. III, 1906–1923.
2.
Hayashi, T., Hattori, M., and Shirai, M.(1968). “Closely spaced pile breakwater as a protection structure against beach erosion.”Coast. Engrg. in Japan, 11, 149–156.
3.
Hayashi, T., and Kano, T. (1966). “Hydraulic research on the closely spaced pile breakwater.”10th Coast. Engrg. Conf., ASCE, New York, N.Y., 873–884.
4.
Khader, M. H. A., and Rai, S. P. (1981). “Wave attenuation due to closely spaced circular cylinders.”Int. Assoc. for Hydr. Res., XIX Congr., New Delhi, India, 95–102.
5.
Mani, J. S. (1989). “Wave damping characteristics of pile breakwaters.”Proc., Third Nat. Conf. on Dock and Harb. Engrg., Dept. of Appl. Mech., KREC, India, 181–188.
6.
Wiegel, R. L.(1960). “Transmission of waves past a rigid vertical thin barrier.”J. Wtrwy. and Harb. Div., ASCE, 86(1), 1–12.

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Go to Journal of Waterway, Port, Coastal, and Ocean Engineering
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 121Issue 6November 1995
Pages: 335 - 338

History

Published online: Nov 1, 1995
Published in print: Nov 1995

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Authors

Affiliations

J. S. Mani
Asst. Prof., Oc. Engrg. Ctr., Indian Inst. of Technol., Madras 600036, India.
S. Jayakumar
Sci., Oc. Engrg. Dept., Nat. Inst. of Oceanography, Goa 403006, India; formerly, Proj. Assoc., Oc. Engrg. Ctr., Indian Inst. of Technol., Madras 600036, India.

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