Hydrodynamic Characteristics of a Free-Surface Semicircular Breakwater Exposed to Irregular Waves
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138, Issue 2
Abstract
A free-surface semicircular breakwater (SCB) has been developed for protecting coastal and marine infrastructures against ocean waves. The hydrodynamic characteristics of the breakwater are investigated in irregular seas through an experimental program. A test model of the semicircular breakwater has been constructed with front wall porosity varied at 0 (i.e., no perforations), 9, 18, and 27%. The wave surface elevations are measured at different locations upstream and downstream of the models, and the coefficients of wave transmission, reflection, and energy dissipation are evaluated. Wave climate in the vicinity of the breakwater models and horizontal wave force on them are also measured. On the basis of the measured data, empirical models are proposed to provide design formulas for wave transmission, wave reflection, and horizontal wave force. The proposed empirical models show good agreement with the measured data; however, sensible engineering judgment must be taken while using these because the equations proposed are based on small-scale laboratory tests. The overall results indicate that the impermeable SCB model is an effective wave reflector, and the permeable SCB models are good energy dissipaters.
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Acknowledgments
The authors acknowledge the financial support of the Institute for Energy Systems of School of Engineering, University of Edinburgh. The authors would also like to thank Universiti Teknologi PETRONAS (Malaysia) for providing scholarship for this study.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138 • Issue 2 • March 2012
Pages: 149 - 163
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Apr 8, 2011
Accepted: Jul 21, 2011
Published online: Jul 25, 2011
Published in print: Mar 1, 2012
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