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Spectrogram analysis of the time-frequency characteristics of ocean wind waves

机译:海洋风波时频特性的频谱图分析

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摘要

The spectrogram based on the short-time Fourier transform is proposed as a tool to study the time frequency evolution of the properties of ocean wind waves. After defining the method to determine the spectrogram of wind waves an example of application is given by analyzing the time series from three sea states concerning a swell, a wind sea and a mixed sea situation. It is shown how the power spectral density function changes with time and its nature when a wave group exists. The result suggests that the energy transfer from high to low frequencies does not occur continuously but in localized periods, exactly when the wave groups occur.
机译:提出了基于短时傅立叶变换的频谱图作为研究海洋风波特性的时频演化的工具。在定义了确定风波频谱图的方法之后,通过分析来自三个海况的有关涨潮,风海和混合海情况的时间序列,给出了一个应用示例。它显示了当存在波群时,功率谱密度函数如何随时间及其性质变化。结果表明,从高频到低频的能量转移不是连续发生的,而是在局部周期内发生的,恰好是在发生波群时。

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