Application of Fuzzy Logic Technology to Evaluate the Performance of Double-Pontoon-Type BreakwaterApplication of Fuzzy Logic Technology to Evaluate the Performance of Double-Pontoon-Type Breakwater

(*) Corresponding author

Authors' affiliations

DOI's assignment:
the author of the article can submit here a request for assignment of a DOI number to this resource!
Cost of the service: euros 10,00 (for a DOI)


Performance of floating breakwaters is usually evaluated by transmission coefficient, Kt. The prediction of Kt with an acceptable accuracy is a vital issue in the evaluation of the breakwater performance. In this research, experimental works and fuzzy logic methodology are used to investigate the performance of double-pontoon-type floating breakwater. Experimental data are employed to develop the fuzzy logic model. Wave steepness, Hi/L, pontoon depth ratio, di/d, gap width ratio, G/bi, and total pontoon width ratio, B/L were used as fuzzy input data to estimate the corresponding transmission coefficient, Kt. Results of fuzzy logic model showed a quite close estimation with the experimental ones. Parametric studies were conducted to investigate the efficiency of the proposed breakwater type. Results of these parametric studies showed that the breakwater efficiency increases as the wave steepness increases along with the increase of back pontoon draft and/or width. Results also showed that the performance of the system to attenuate the wave energy increased when the back pontoon draft was higher than the front one. The gap between pontoons has also a significant effect on the transmission coefficient. The transmission coefficient improved as the gap width decreases. Finally, a simple empirical formula is developed to estimate the transmission coefficient of regular waves.
Copyright © 2018 Praise Worthy Prize - All rights reserved.


Floating Breakwaters; Fuzzy Logic Model; Pontoon-Type; Wave Transmission

Full Text:



Neelamania, S., and Gayathrib, T., “Wave Interaction with Twin Plate Wave Barrier”. Ocean Engineering, 33, pp. 495-516, 2006.

Sundar, V., and Subbarao, V., “Hydrodynamic Performance Characteristics of Quadrant Front-Face Pile-Supported Breakwater”. Journal of Waterway, Port, Coastal, and Ocean Engineering, 129(1), pp. 22-33, 2003.

Gunaydm, K., and Kabdash, M., “Performance of Solid and Perforated U-Type Breakwaters under Regular and Irregular Waves”. Ocean Engineering, 31, pp. 1377-1405, 2004.

Koutandos, E., Prinos, P., and Gironelia, X., “Floating Breakwater under Regular and Irregular Wave Forcing: Reflection and Transmission Characteristics”. Journal of hydraulic Research, 43 (2), pp. 174-188, 2005.

Rageh O., El–Alfy, K., Shamaa, M., and Diab, R., “An Experimental Study of Spherical Floating Bodies under Waves” Tenth International water Technology Conference, pp. 357-375, 2006.

Chaiheng, L., “System Performance of a Composite Stepped-Slope Floating Breakwater”. M.Sc. Thesis, Faculty of Civil Eng., Uni. Teknologi Malaysia, Malaysis, 281p, 2006.

Dong, G., Zheng, Y., Li, Y., Teng, B., Guan, C., and Lin, D., “Experiments on Wave Transmission Coefficients of Floating Breakwaters”. Ocean Engineering, 35, pp. 931-938, 2008.

Rageh, O., “Hydrodynamic Efficiency of Floating Breakwater with Plates”. Journal of Mansoura Engineering, Faculty of Engineering Mansoura University, Egypt, 34 (2), pp. 126-141, 2009.

Tolba, E., “Behavior of Floating Breakwater under Wave Action”. Ph. D. Thesis, Suez Canal University, Egypt, 148p, 1998.

Bhat, S., “Performance of Twin-Pontoon Floating Breakwaters”. M. Sc. Thesis, Faculty of Graduate Studies, Department of Civil Eng., Uni. of British Columbia, 197p, 1998.

Sannasiraji, S., Sundar, V., and Sundaravadivelu, R., “Mooring Forces and Motion Response of Pontoon-Type Floating Breakwater”. Ocean Engineering, 25 (1), pp. 27-48, 1998.

Ozeren. Y., “Experimental and Numerical Investigation of Floating Breakwater Performance”. Ph. D. Thesis, University of Mississippi, 391p, 2009.

Koutandos, E., Karambas, Th., Koutitas, C., and Prinos, P., “Floating Breakwater Efficiency in Intermediate and Shallow Waters”. International Conference of Hydrodynamic and Engineering, Portland, pp. 1-10, 2002.

Kriezi, E., Karambas, V., Prinos, P., and Koutitas, C., “Interaction of Floating Breakwater with Waves in Shallow Waters”. International Conference IAHR, Theme E, Beijing, China, pp. 1-14, 2001.

Gesraha, M., “An Eigen function Expansion Solution for Extremely Flexible Floating Pontoons in Oblique Waves”. Ocean Research, 26, pp. 171-182, 2004.

Loukogeorgaki, E., and Angelides, D., “Stiffness of Mooring Lines and Performance of Floating Breakwater in Three Dimensions”. Ocean Engineering, 27, pp. 187-208, 2005.

Murali, K., and Mani, J., “Performance of Cage Floating Breakwater”. Journal of Waterway, Port, Coastal, and Ocean Engineering, 123 (4), pp. 172-178, 1997.

Williams, A., and Abul-Azm, A., “Dual Pontoon Floating Breakwater”. Ocean Engineering, 24 (5), pp. 465-478, 2000.

Briggs, M., Ye, W., Demirbilek, Z., and Zhang, J., “Field and Numerical Comparisons of the RIBS Floating Breakwater”. Journal of Hyd. Research, 40 (3), pp. 289-301, 2002.

Chen, C.W., “Modeling and Fuzzy PDC Control and Its Application to an Oscillatory TLP Structure” Mathematical Problems in Eng., 2010, Article ID 120403, 13 pages, 2010.

Chen, C.Y., Lin, J.W., Lee, W.I., and Chen, C.W., “Fuzzy control for an oceanic structure: A case study in time-delay TLP system”. Journal of Vibration and Control, 16 (1), pp. 147–160, 2010.

Chen, C.W., “Stability conditions of fuzzy systems and its application to structural and mechanical systems”. Advances in Engineering Software, 37(9), pp. 624–629, 2006.

Zadeh, L.A., “Fuzzy sets”. Information and Control, Vol. 8, pp. 338–353, 1965.

Mandani, E.H., “Application of fuzzy logic to approximate reasoning using linguistic synthesis”. IEEE Transactions on Computers, C-26 (12), pp. 1182–1191, 1977.

Sen, Z., “Fuzzy algorithm for estimation of solar irradiation from sunshine duration”. Solar Energy, 63, pp. 39–49, 1998.

Zadeh, L.A., “The role of fuzzy-logic in modeling, identification and control”. Information and Control, 15 (3), pp. 191-203, 1994.

Hughes, S.A. “Physical Models and Laboratory Techniques in Coastal Engineering”. Advanced Series on Ocean Engineering, Vol. 7, World Scientific Pub. Company, 568p, 1993.


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2024 Praise Worthy Prize