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The function of submerged active breakwaters
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Dissertation
The function of submerged active breakwaters
1997
Overview
A submerged active breakwater consists of a large horizontal cylinder moored by a spring and damper retention system. In response to incident waves, the cylinder is forced to oscillate in heave and sway. The spring and damper rates can be tuned to provide a considerable amount of wave attenuation during specific wave conditions. Hydraulic model tests were undertaken in a two-dimensional wave flume at the Queen's University Coastal Engineering Research Laboratory in Kingston, Ontario. The tests investigated the performance of such devices in regular and random wave conditions of varying height and period, and observed the effect of variation in submergence depth. Two breakwaters were placed in series to observe the benefit of using multiple breakwaters. The results were compared with two simple mathematical models. The study showed that these breakwaters can absorb significant amounts of wave energy from regular and irregular waves. The performance was primarily a function of wave frequency and it decreased with increased wave height and increased submergence depth. Two devices in series provided more wave attenuation over broader ranges of wave conditions than a single breakwater. The mathematical models were capable of predicting trends observed in the test data very well but were only satisfactory at predicting the actual wave transmission and power absorption efficiency.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
0612223027, 9780612223028
