Motion Response and Wave Attenuation of Linked Floating Breakwaters
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 116, Issue 5
Abstract
A mathematical model has been developed for the motion response and wave attenuation of two linked floating breakwaters moored to the ocean floor. The two‐body interaction problem is divided into a hydrodynamic problem and a motion response problem. The hydrodynamic problem deals with the calculation of the wave‐exciting, added mass, and damping forces on the two bodies induced by incident regular waves and the waves caused by the motion of the bodies. The motion response problem considers a mechanical system subjected to the harmonic hydrodynamic forces and restrained by the mooring lines and the elastic links between the two bodies. The mathematical model has been programmed using a three‐dimensional finite element technique. The numerical model accounts for all three‐dimensional effects, including the incidence of oblique waves, the interaction of the two breakwaters, their finite length‐to‐width ratio, the finite water depth, and the proximity of solid boundaries. Both frequency‐domain (linear) and time‐domain (nonlinear) solutions of the breakwater motion can be obtained. The results of example calculations are presented to demonstrate the use of the numerical model.
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References
1.
Adee, B. H., and Martin, W. (1974). “Theoretical analysis of floating breakwater performance.” Proc., Floating Breakwater Conf., Newport, R.I., 20–40.
2.
Bretz, G. (1988). “Deployment of deployable ports may prove vital to U.S. Navy.” Offshore, 48(12), 14–18.
3.
Duncan, J. H., Barr, R. A., and Liu, Y. Z. (1983). “Computations of the coupled response of two‐bodies in a seaway.” Int. Workshop on Ship and Platform Motions, Univ. of California at Berkeley, Berkeley, Calif., Oct.
4.
Fang, M. C., and Kim, C. H. (1986a). “Hydrodynamically coupled motions of two ships advancing in oblique waves.” J. Ship Res., 30(3), 159–171.
5.
Fang, M. C., and Kim, C. H. (1986b). “Two‐dimensional analysis of the lateral drifting force between two floating structures.” J. Ship Res., 30(3), 194–199.
6.
Fang, M. C., and Kim, C. H. (1987). “An analysis of water shipping between two floating platforms in the beam waves.” J. Offshore Mech. Arctic Engrg., 109, May, 179–185.
7.
Harris, A. J., and Thomas, J. M. (1974). “The Harris floating breakwater.” Proc. Floating Breakwater Conf., Newport, R.I., 213–232.
8.
Hwang, Y.‐L., and Bando, K. (1987). “Motion analysis of a berthed container ship in frequency and time domains.” Proc., Coastal Hydrodynamics, 413–427.
9.
Kim, C. H. (1972). “The hydrodynamic interaction between two cylindrical bodies floating in beam seas.” Report S1T‐OE‐72‐10, Stevens Inst. of Tech., Hoboken, N.J.
10.
Kim, C. H., and Fang, M. C. (1985). “Vertical relative motion between two longitudinally parallel adjacent platforms in oblique waves.” Proc., 4th Int. Symp. on Offshore Mechanics and Arctic Engrg., 5. Dallas, Tex., 114–124.
11.
Kodan, N. (1984). “The motions of adjacent floating structures in oblique waves.” J. Energy Resour. Tech., 106, June, 199–205.
12.
Kowalski, T. (1974). “Scrap tire floating breakwaters.” Proc., Floating Breakwater Conf., Newport, R.I., 233–246.
13.
Leonard, J. W., Huang, M. C., and Hudspeth, W. (1983). “Hydrodynamic interference between floating cylinders in oblique seas.” Appl. Ocean Res., 5(3), 158–166.
14.
Loken, A. E. (1981). “Hydrodynamic interaction between several floating bodies of arbitrary form in waves.” Int. Symp. on Hydrodynamics in Ocean Engrg., Norwegian Inst. of Technology, 2.
15.
Newmark, N. M. (1959). “A method of computation for structural dynamics.” J. Engrg. Mech. Div., ASCE, 85, 67–94.
16.
Ohkusu, M. (1976). “Ship motions in vicinity of a structure.” BOSS 76, First Int. Conf. of Behavior of Offshore Structures, Trodheim, Norway.
17.
Richey, E. P., and Nece, R. E. (1974). “Floating breakwaters—State of the art.” Proc. Floating Breakwater Conf., Newport, R.I., 1–20.
18.
Valioulis, I. A. (1988). “Computer program of moored ship response at berth.” Report to U.S. Army Engineers Waterways Experimental Station, Coastal Engrg. Res. Ctr., Vicksburg, Miss.
19.
Valioulis, I. A. (1989). “Wave and ship motion analysis for the vessel Alafoss moored in Reykjavik harbor.” Report to U.S. Army Engineers Waterways Experimental Station, Coastal Engrg. Res. Ctr., Vicksburg, Miss.
20.
van Oortmerssen, G. (1979). “Hydrodynamic interaction between two structures floating in waves.” BOSS 79, Second Int. Conf. on Offshore Structures, London, U.K., 1, 339–356.
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Copyright © 1990 ASCE.
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Published online: Sep 1, 1990
Published in print: Sep 1990
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