|Water Science and Engineering 2012, 5(3) 291-303 DOI: 10.3882/j.issn.1674-2370.2012.03.005 ISSN: 1674-2370 CN: 32-1785/TV|
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Time-domain hydrodynamic analysis of pontoon-plate floating breakwater
Zhi-jie CHEN*1, 2, Yong-xue WANG3, Hua-yang DONG4, Bin-xin ZHENG1
1. Open Laboratory of Ocean & Coast Environmental Geology, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, P. R. China
The hydrodynamic behaviors of a floating breakwater consisting of a rectangular pontoon and horizontal plates are studied theoretically. The fluid motion is idealized as two-dimensional linear potential flow. The motions of the floating breakwater are assumed to be two-dimensional in sway, heave, and roll. The solution to the fluid motion is derived by transforming the governing differential equation into the integral equation on the boundary in time domain with the Green’s function method. The motion equations of the floating breakwater are established and solved with the fourth-order Runge-Kutta method to obtain the displacement and velocity of the breakwater. The mooring forces are computed with the static method. The computational results of the wave transmission coefficient, the motion responses, and the mooring forces of the pontoon-plate floating breakwater are given. It is indicated that the relative width of the pontoon is an important factor influencing the wave transmission coefficient of the floating breakwater. The transmission coefficient decreases obviously as the relative width of the pontoon increases. The horizontal plates help to reduce the wave transmission over the floating breakwater. The motion responses and the mooring forces of the pontoon-plate floating breakwater are less than those of the pontoon floating breakwater. The mooring force at the offshore side is larger than that at the onshore side.
|Keywords： hydrodynamic analysis pontoon-plate floating breakwater transmission coefficient motion response mooring force|
|Received 2011-07-26 Revised 2012-04-26 Online: 2012-09-25|
This work was supported by the National Natural Science Foundation of China (Grant No. 51009032), the Scientific Research Foundation of Third Institute of Oceanography, SOA (Grant No. 201003), and the Open Research Fund Program of Hunan Province Key Laboratory of Water, Sediment Science & Flood Hazard Prevention (Grant No. 2010SS03).
|Corresponding Authors: Zhi-jie CHEN|
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