SOLID AND PERMEABLE SUBMERGED BREAKWATERS
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Keywords

solid breakwater
permeable breakwater
submerged breakwater

How to Cite

Dick, T. M., & Brebner, A. (1968). SOLID AND PERMEABLE SUBMERGED BREAKWATERS. Coastal Engineering Proceedings, 1(11), 72. https://doi.org/10.9753/icce.v11.72

Abstract

The behaviour of thin and rectangular solid submerged breakwaters is re-examined. Dean's theory is found to be correct for a thin barrier in infinitely deep water. An empirical and theoretical relationship for the reflection coefficient of a thin breakwater across the wave number spectrum is proposed. Rectangular solid breakwaters have a maximum reflection when the incident wave has the same period as a standing wave on top of the breakwater and with a wave length equal to the crest width. A submerged permeable breakwater for depths of submergence greater than 5% of the total depth transmits less wave energy than the solid over a certain frequency range. The minimum is transmitted when the criterion above for solid breakwaters is also met. Both permeable and solid rectangular breakwaters cause a substantial loss in wave energy and at least 501 of the incident energy is lost to turbulence. A substantial proportion, 30 to 601 of the energy transmitted is transferred to higher frequencies than the incident wave.
https://doi.org/10.9753/icce.v11.72
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