| A Study of Bispectra in Relation to the Adequacy of Wave Spectral Model |
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| 作者单位： | Yi-Yu Kuo，Chung-Ching Chien John Y. Yim Professor，Department of Civil Enineering，Chiao Tung University，Taiwan Researcher，Institute of Harbor and Marine Technology，Taiwan Assistant Professor，Department of Harbor and River Engineering，Taiwan Ocean University，Taiwan |
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| 摘 要： | In this paper.the characteristics of laboratory wind waves under various wind speeds and wat-er depths are studied.It is found that either the real or the imaginary part of the bispectrum can be relatedto the asymmetry of the wave profile,and the bicoherence is related to the ratio of nonlinear to linear wavecomponent.Occasionally,these two categories of nonlinear index lead to opposite inferences,because eachof them has its own significance and functions.The applicability of linear wave spectral model in oceanwaves becomes questionable only when strong nonlinearity is indicated by both of these two indexes.Thelinear spectral representation of wave fields does not necessarily become inadequate as water depth de-creases,and its appropriateness can be examined through the characteristics of the bispectrum.
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A Study of Bispectra in Relation to the Adequacy of Wave Spectral Model |
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| Yi-Yu Kuo,Chung-Ching Chien John Y. Yim Professor. A Study of Bispectra in Relation to the Adequacy of Wave Spectral Model[J]. China Ocean Engineering, 1997, 0(2) |
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| Authors: | Yi-Yu Kuo Chung-Ching Chien John Y. Yim Professor |
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| Affiliation: | Yi-Yu Kuo,Chung-Ching Chien John Y. Yim Professor,Department of Civil Enineering,Chiao Tung University,Taiwan Researcher,Institute of Harbor and Marine Technology,Taiwan Assistant Professor,Department of Harbor and River Engineering,Taiwan Ocean University,Taiwan |
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| Abstract: | In this paper, the characteristics of laboratory wind waves under various wind speeds and water depths are studied. It is found that either the real or the imaginary part of the bispectrum can be related to the asymmetry of the wave profile, and the bicoherence is related to the ratio of nonlinear to linear wave component. Occasionally, these two categories of nonlinear index lead to opposite inferences, because each of them has its own significance and functions. The applicability of linear wave spectral model in ocean waves becomes questionable only when strong nonlinearity is indicated by both of these two indexes. The linear spectral representation of wave fields does not necessarily become inadequate as water depth decreases, and its appropriateness can be examined through the characteristics of the bispectrum. |
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| Keywords: | bispectrum nonlinearity spectral form wave spectral model |
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