Water‐Level Oscillations in Esperance Harbour
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 118, Issue 4
Abstract
Measurements of water‐surface elevation in a harbor were analyzed to determine the forcing mechanisms causing the excessive motion of moored ships. The spectral density of water‐surface elevation measured at four locations is presented by a time‐frequency distribution. A numerical model based on a modified mild slope equation approximation of wave refraction, diffraction, and reflection in and around the harbor was employed to simulate the transformation of waves entering the harbor. The performance of the model was validated against the field data by comparing predicted and observed wave heights at field measurement locations within the harbor; deviations of predicted ratios from those observed are discussed. Ship motions recorded at berth during the field study were analyzed in context of the concurrent wave spectra in order to isolate the dominant forcing mechanisms causing the moored ship response. The groupiness of incident swell waves was analyzed to investigate the origin of long‐period water‐level oscillations measured in the harbor; and harbor resonance is discussed in relation to the amplification of these long‐period oscillations.
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References
1.
Bendat, J. S., and Piersol, A. G. (1971). Random data: Analysis and measurement procedures. John Wiley & Sons, Inc., New York, N.Y.
2.
Berkhoff, J. C. W. (1972). “Computation of combined refraction‐diffraction.” Proc. 13th Int. Conf. Coastal Engrg., ASCE, New York, N.Y., 471–490.
3.
Bowers, E. C. (1977). “Harbour resonance due to set‐down beneath wave groups.” J. Fluid Mech., 7(1), 71–92.
4.
Buchan, S. J., Steedman, R. K., Stroud, S. A., and Provis, D. G. (1984). “A shallow water directional wave recorder.” Proc. 19th Int. Conf. Coastal Engrg., ASCE, New York, N.Y., 1, 287–303.
5.
Chakrabarti, S. K. (1987). Hydrodynamics of Offshore Structures. Computational Mechanics Publications, Southhampton, United Kingdom.
6.
Funke, E. R., and Mansard, E. P. D. (1980). “On the synthesis of realistic sea states.” Proc., 17th Int. Conf. on Coastal Engrg., ASCE, New York, N.Y., 2974–2991.
7.
Goda, Y. (1983). “Analysis of wave grouping and spectra of long travelled swell.” Rep. Port Harbour Res. Inst., 22(1), 3–41.
8.
Kinsman, B. (1965). Wind waves: Their generation and propagation on the ocean surface. Prentice‐Hall, Inc., Englewood Cliffs, N.J.
9.
Lewis, D. P., Tsutsui, S., Morison, M. L., and Imberger, J. (1989). “Esperance Harbour ship motion study.” Report No. WP‐297‐DL, Centre for Water Research, University of Western Australia, Nedlands, Western Australia, Australia.
10.
Longuet‐Higgins, M. S., and Stewart, R. W. (1960). “Changes in the form of short gravity waves on long waves and tidal currents.” J. Fluid Mech., 8, 565–583.
11.
Longuet‐Higgins, M. S., and Stewart, R. W. (1961). “The changes in amplitude of short gravity waves on steady non‐uniform currents.” J. Fluid Mech., 10, 529–549.
12.
Longuet‐Higgins, M. S., and Stewart, R. W. (1962). “Radiation stresses and mass transport in gravity waves with applications to surf‐beats.” J. Fluid Mech., 13, 481–504.
13.
Longuet‐Higgins, M. S., and Stewart, R. W. (1964). “Radiation stresses in water waves; a physical discussion, with applications.” Deep‐Sea Res., 11, 529–562.
14.
Sand, S. (1982). “Long wave problems in laboratory models.” J. Wtrwy., Port, Coast., and Oc. Engrg., ASCE, 108(4), 492–503.
15.
Lopez, J. C. S., and Pina, G. G. (1988). “Long wave analysis in a Spanish Harbour.” Proc. 23rd Int. Conf. Coastal Engrg., ASCE, New York, N.Y., 984–998.
16.
Sutherland, C. G. (1985). “Esperance Harbour surging investigations,” Bachelor's Honors thesis, University of Western Australia, Nedlands, Western Australia, Australia.
17.
Tsutsui, S., and Lewis, D. P. (1990). “Wave height prediction in unbounded coastal domains with bathymetric discontinuities.” University of the Ryukyus, Okinawa, Japan.
18.
Tucker, M. J. (1950). “Surf beats: Sea waves of 1 to 5 minutes' period.” Proc. Royal Soc. London, A 207, 565–573.
19.
Ursell, F. (1953). “The long wave paradox in the theory of gravity waves.” Proc. Cambridge Philosophical Soc., 49, 685–694.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 118 • Issue 4 • July 1992
Pages: 352 - 367
Copyright
Copyright © 1992 ASCE.
History
Published online: Jul 1, 1992
Published in print: Jul 1992
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