Physical modeling of a floating breakwater with a membrane
Hermanson, Michael W.
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were tested at 8 different wave periods ranging from 0.5 seconds to 1.2 seconds and each test was performed twice. Thus, 72 combinations were examined and approximately 150 flume runs were completed to collect data for this project. The average transmission coefficient for each of the nine cases ranged from 0.705 to 0.853. In all cases tested, the addition of a membrane to the floating breakwater reduced the transmitted wave height relative to the structure with no membrane. The average wave transmission coefficient was 0.85 for the structure with no membrane. The average far all the configurations with a membrane was 0.75, or about a 12% reduction. The most effective membrane configuration gave a reduction of 17%. For the breakwater configurations and wave conditions tested, the following results were observed: (1) a membrane that is 1/4 of the water depth in length is more effective than membrane lengths of 1/2 the depth and the full depth in length, (2) lower transmission was obtained by placing the membrane at the lee side of the structure rather than the front or center, (3) a permeable membrane is more effective than an impermeable membrane, and (4) elastic mooring lines had a lower transmission than stiff moorings. (13 tables, 53 figures, 26 photographs, 16 refs.)
This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library Collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title.
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