Wave Reflection from Breakwater
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 121, Issue 5
Abstract
A new method is presented for estimating the reflection of a random, multidirectional sea from a coastal structure. The technique is applicable to an array of wave gauges of arbitrary geometry deployed seaward of the reflector. An expansion for small oblique wave-incidence angles is used to derive an approximate relationship between measured array cross-spectra and a small number of parameters that describe the incident-wave properties and the reflectivity of the structure. Model tests with simulated array data demonstrate that the gross properties of incident and reflected waves can be accurately estimated for wave-incidence angles less than about 30°. The new method is applied to array data acquired offshore of a permeable, rubble-mound breakwater in Monterey Bay, California. The estimated reflection coefficients decrease approximately linearly with increasing frequency. Whereas the observed reflections depend only weakly on the incident-wave energy, the fraction of the incident-wave energy flux transmitted through the breakwater decreases with increasing wave energy, suggesting that dissipation is enhanced with large-amplitude waves.
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References
1.
Davidson, M. A., Bird, P. A. D., Bullock, G. N., and Huntley, D. A. (1994). “Wave reflection: field measurements, analysis and theoretical developments.”Proc., Coast. Dynamics '94, ASCE, New York, N.Y., 642–655.
2.
Goda, Y., and Suzuki, Y. (1976). “Estimation of incident and reflected waves in random wave experiments.”Proc., 15th Int. Coast. Engrg. Conf., ASCE, New York, N.Y., 828–845.
3.
Herbers, T. H. C., Elgar, S., Guza, R. T., and O'Reilly, W. C.(1995). “Infragravity-frequency (0.005–0.05 Hz) motions on the shelf, part II: free waves.”J. Phys. Oceanogr., 25(6), 1063–1079.
4.
Isobe, M., and Kondo, K. (1984). “Method for estimating directional wave spectrum in incident and reflected wave field.”Proc., 19th Int. Coast. Engrg. Conf., ASCE, New York, N.Y., 467–483.
5.
Long, R. B., and Hasselmann, K.(1979). “A variational technique for extracting directional spectra from multi-component wave data.”J. Phys. Oceanogr., 9(2), 373–381.
6.
Mansard, E. P. D., and Funke, E. R. (1980). “The measurement of incident and reflected spectra using a least squares method.”Proc., 17th Int. Coast. Engrg. Conf., ASCE, New York, N.Y., 154–172.
7.
Morden, D. B., Richey, E. P., and Christensen, D. R. (1976). “Decomposition of co-existing random wave energy.”Proc., 15th Int. Coast. Engrg. Conf., ASCE, New York, N.Y., 846–865.
8.
Thornton, E. B., and Calhoun, R. J.(1972). “Spectral resolution of breakwater reflected waves.”J. Wtrwy., Harb., and Coast. Engrg. Div., ASCE, New York, N.Y., 98(4), 443–460.
9.
Yokoki, H., Isobe, M., and Watanabe, A. (1992). “A method for estimating reflection coefficient in short-crested random seas.”Proc., 23rd Int. Coast. Engrg. Conf., ASCE, New York, N.Y., 765–776.
10.
Zelt, J. A., and Skjelbreia, J. E. (1992). “Estimating incident and reflected wave fields using an arbitrary number of wave gauges.”Proc., 23rd Int. Coast. Engrg. Conf., ASCE, New York, N.Y., 777–789.
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Copyright © 1995 American Society of Civil Engineers.
History
Published online: Sep 1, 1995
Published in print: Sep 1995
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