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China Ocean Engineering

, Volume 33, Issue 1, pp 103–113 | Cite as

Experimental Study of Wave Attenuation in Trapezoidal Floating Breakwaters

  • A. H. Nikpour
  • M. N. MoghimEmail author
  • M. A. Badri
Article

Abstract

A comprehensive experimental study was carried out on the regular wave attenuation with a trapezoidal pontoontype floating breakwater (FB) in deep water. The functionalities of two simple FB geometries consist of a rectangle and a trapezoid with the slope of 60° were investigated under the wave attack. A two-dimensional wave flume was used in the experiment; the incident, transmitted waves, mooring line forces and motion responses of the floating breakwaters were measured. Also the influence of the sea state conditions (incident wave height and wave period) and structural parameters (draught of the structure) were investigated using the trapezoidal FB. Our experimental results indicated that the trapezoidal FB significantly reduced the wave transmission and mooring line force when compared with rectangular FBs. A new formula was developed in order to predict the value of the transmission coefficient in trapezoidal FBs with the slope of 60°. Experimental data showed to be consistent with the results of the formula.

Key words

regular waves floating breakwater (FB) wave flume trapezoid mooring line force transmission 

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Notes

Acknowledgements

The authors wish to express their sincere thanks to the Research Institute for Subsea Science and Technology, Isfahan University of Technology (IUT) in Iran for providing experimental facilities.

References

  1. Abdolali A. and Kolahdoozan M., 2011. Comparison of analytical methods of wave decomposition for evaluating reflection coefficient, Journal of Marine Engineering, 7(14), 105–116.Google Scholar
  2. Abdolali A., Franco L., Bellotti G. and Kolahdoozan M., 2012. Hydraulic and numerical modeling of the performance of p-type floating breakwaters, Proceeding of the 10th International Conference on Coasts, Ports and Marine Structures (ICOPMAS), Tehran, Iran.Google Scholar
  3. Abul-Azm A.G. and Gesraha M.R., 2000. Approximation to the hydrodynamics of floating pontoons under oblique waves, Ocean Engineering, 27(4), 365–384.CrossRefGoogle Scholar
  4. Cheng L.H., Fen C.Y., Li Y.H. and Jiang W.Y., 2013. Experimental study on a new type floating breakwater, Proceedings of the 7th International Conference on Asian and Pacific Coasts, Hasanuddin University Press, Bali, Indonesia, Sep. 24–26.Google Scholar
  5. Drimer N., Agnon Y. and Stiassnie M., 1992. A simplified analytical model for a floating breakwater in water of finite depth, Applied Ocean Research, 14(1), 33–41.CrossRefGoogle Scholar
  6. Elchahal G., Younes R. and Lafon P., 2008. The effects of reflection coefficient of the harbour sidewall on the performance of floating breakwaters, Ocean Engineering, 35(11–12), 1102–1112.CrossRefGoogle Scholar
  7. Gesraha M.R., 2006. Analysis of p shaped floating breakwater in oblique waves: I. Impervious rigid wave boards, Applied Ocean Research, 28(5), 327–338.CrossRefGoogle Scholar
  8. Hales L.Z., 1981. Floating Breakwater: State-of-the-Art, Literature Preview, Technical Report No. TR-81–1, U.S. Army Coastal Engin-eering Research Center, Fort Belvoir, VA.Google Scholar
  9. He F., Huang Z.H. and Adrian W.K.L., 2012. Hydrodynamic performance of a rectangular floating breakwater with and without pneumatic chambers: An experimental study, Ocean Engineering, 51, 16–27.CrossRefGoogle Scholar
  10. Ji C.Y., Chen X., Cui J., Yuan Z.M. and Incecik A., 2015. Experimental study of a new type of floating breakwater, Ocean Engineering, 105, 295–303.CrossRefGoogle Scholar
  11. Koftis T. and Prinos P., 2005. Improved hydrodynamic efficiency of pontoon-type floating breakwaters, Proceedings of XXXI International Conference IAHR, IAHR, Seoul, Korea, 4047–4056.Google Scholar
  12. Koraima A.S. and Rageh O.S., 2013. Effect of under connected plates on the hydrodynamic efficiency of the floating breakwater, China Ocean Engineering, 28(3), 349–362.CrossRefGoogle Scholar
  13. Koutandos E.V., Karambas T.V., and Koutitas C.G., 2004. Floating breakwater response to waves action using a Boussinesq model coupled with a 2DV elliptic solver, Journal of Waterway, Port, Coastal, and Ocean Engineering, 130(5), 243–255.CrossRefGoogle Scholar
  14. Mani J.S., 1991. Design of Y-frame floating breakwater, Journal of Waterway, Port, Coastal, and Ocean Engineering, 117(2), 105–118.CrossRefGoogle Scholar
  15. Mansard E.P.D. and Funke E.R., 1980. The measurement of incident and reflected spectra using a least squares method, Proceedings of the 17th International Conference on Coastal Engineering, Sydney, Australia, 154–172.Google Scholar
  16. Moghim M.N. and Botshekan M., 2017. Analysis of the performance of Pontoon-type floating breakwaters, HKIE Transactions, 24(1), 9–16.CrossRefGoogle Scholar
  17. Murali K. and Mani J.S., 1997. Performance of cage floating breakwater, Journal of Waterway, Port, Coastal, and Ocean Engineering, 123(4), 172–179.CrossRefGoogle Scholar
  18. Peña E., Ferreras J. and Sanchez-Tembleque F., 2011. Experimental study on wave transmission coefficient, mooring lines and module connector forces with different designs of floating breakwaters, Ocean Engineering, 38(10), 1150–1160.CrossRefGoogle Scholar
  19. Sannasiraj S.A., Sundar V. and Sundaravadivelu R., 1998. Mooring forces and motion responses of pontoon-type floating breakwaters, Ocean Engineering, 25(1), 27–48.CrossRefGoogle Scholar
  20. Tang H.J., Huang C.C. and Chen W.M., 2011. Dynamics of dual pontoon floating structure for cage aquaculture in a two-dimensional numerical wave tank, Journal of Fluids and Structures, 27(7), 918–936.CrossRefGoogle Scholar
  21. Weng W.K. and Chou C.R., 2007. Analysis of responses of floating dual pontoon structure, China Ocean Engineering, 21(1), 91–104.Google Scholar
  22. Williams A.N. and Abul-Azm A.G., 1997. Dual pontoon floating breakwater, Ocean Engineering, 24(5), 465–478.CrossRefGoogle Scholar
  23. Yao G.Q., Ma Z.X. and Ding B.C., 1993. Experimental study on rectangular floating breakwaters, China Ocean Engineering, 7(3), 323–332.Google Scholar

Copyright information

© Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringIsfahan University of TechnologyIsfahanIran
  2. 2.Research Institute for Subsea Science and TechnologyIsfahan University of TechnologyIsfahanIran

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