Chapter
Dec 31, 2015
Irregular Wave Loading on a Conical Structure
Publication: Coastal Engineering 1988
Abstract
The horizontal forces, vertical forces and overturning moments exerted by waves on a fixed model of a 45" conical structure are presented. Irregular wave loading tests were conducted for a range of conditions described by base diameter on peak period wave length D/Lp from 0.31 to 1.76, water depth on peak period wave length h/Lp from 0.11 to 0.63, and significant wave height on peak period wave length Hm0/Lp up to 0.07.
Time series records, spectral densities and transfer functions for the irregular wave loading tests are used to illustrate the nonlinear nature of the measured wave loads. In most cases, similar trends in wave loading were observed for irregular and regular wave tests. For deep-water waves, the irregular and regular force measurements showed spectral peaks at the second harmonic of the wave frequency even though the waves themselves had relatively small second-order components. However, unlike the regular wave loading results, the fundamental spectral peak frequency for the irregular wave forces occurred at a frequency considerably lower than the peak frequency of the waves. Although linear diffraction theory provided a reasonable estimate of the wave forces for waves of low steepness, larger deviations were often present for higher wave steepness results. Comparison of theory and experiment for overturning moments was generally very poor for most wave conditions.
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© 1989 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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Wayne W. Jamieson
Research Officers, National Research Council of Canada, Hydraulics Laboratory, Montreal Rd., Bldg. M-32, Ottawa, Ontario, K1A 0R6, Canada.
Etienne P. D. Mansard
Research Officers, National Research Council of Canada, Hydraulics Laboratory, Montreal Rd., Bldg. M-32, Ottawa, Ontario, K1A 0R6, Canada.
Geoffrey R. Mogridge
Research Officers, National Research Council of Canada, Hydraulics Laboratory, Montreal Rd., Bldg. M-32, Ottawa, Ontario, K1A 0R6, Canada.
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