深水风浪的平均波长与平均周期的关系
Relationships between mean wavelength and mean wave-period of wind wave in deep water
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摘要: 在Gaussian波场基础上,推导出以P-M谱和平均JONSWAP谱代表的充分成长和有限风区的深水风浪平均波长与平均波周期之间的关系为.推导中运用了Rice跨零点问题的解并通过滑动时间平均技术估计4阶谱矩.在风浪水槽进行了实验,实验结果与有限风区下推导出的关系相比较,符合较好.Abstract: Relationships between the mean wavelength and mean wave-period of wind waves are derived for fetch-limited and ful-ly developed sea states represented by mean JONSWAP spectrum and P-M spectrum,respectively,and found to be ,The derivations start from the Rice solution of zero-crossirtt; problem and the spectral moment of 4-orders involved in the derivations are estimated through a time-averaging technique,Experiments have been conducted }n a wind-wave channel,The experimented results are compared with the derived relationship,showing a favorable agreement.
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Key words:
- Spectral moment of 4-orders /
- time-averaging technique /
- Hilbert transform
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