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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Directional spectra of hurricane wind waves
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Directional spectra of hurricane wind waves

机译：飓风风的方向谱

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摘要

A comprehensive directional wave buoy data set showing the directional wave spectrum during the passage of a number of hurricanes is presented. The data confirm remote sensing measurements, showing that waves in the forward quadrants of the storm are dominated by swell radiating out from the intense wind regions to the right of the storm centre. The data show that for almost all quadrants of the storm, the dominant waves are remotely generated swell. The directional spectra are composed of swell at low frequency (the dominant waves) and locally generated waves above approximately three times the spectral peak frequency. There is, however, no tendency for the spectrum to become bi-modal in either frequency or direction. Rather, the spectra are directionally skewed, with a smooth directional transition from low frequency to high frequency. As for uni-directional wind field cases, the spectra are narrowest at the spectral peak frequency and broaden at frequencies above and below the peak. Despite the fact that much of the wave field is dominated by swell, the spectral width, as a function of non-dimensional frequency is very similar to that reported for uni-directional wind fields. The one-dimensional spectrum can be approximated by the parametric form proposed by Donelan et al. (1985). The parameters defining the spectrum also follow the same functional dependence as that reported for uni-directional winds. The fact that both the one-dimensional and directional spectra are very similar to spectra reported under simple uni-directional winds is interpreted as being a result of the shape stabilization effects of non-linear interactions. The data exhibit these same functional forms at low frequencies where they can be receiving no significant local input from the wind. This result indicates that the spectral shape is being controlled almost completely by the non-linear interactions with input and dissipation terms of lesser importance. This result indicates that input and dissipation are important in determining the total quantity of energy in the wave field, but appear to play only a minor role in determining the spectral shape.
机译：提供了一个全面的定向波浮标数据集，该数据集显示了许多飓风通过期间的定向波谱。数据证实了遥感测量的结果，表明风暴前象限中的波主要由从风暴中心右侧的强风区域辐射出来的浪涌所主导。数据显示，几乎在风暴的所有象限中，优势波都是远程产生的。定向频谱由低频下的隆起（主导波）和高于频谱峰值频率三倍的局部产生的波组成。但是，频谱在频率或方向上都不会变成双峰。相反，频谱是有方向性的，从低频到高频有平滑的方向过渡。对于单向风场情况，频谱在频谱峰值频率处最窄，而在峰值上方和下方的频率处变宽。尽管事实上大部分波场都由膨胀控制，但作为无量纲频率的函数的谱宽与单向风场的谱宽非常相似。一维频谱可以通过Donelan等人提出的参数形式来近似。 （1985）。定义频谱的参数还遵循与单向风所报告的函数相同的函数依赖性。一维光谱和定向光谱都与简单单向风中报告的光谱非常相似的事实被解释为是非线性相互作用的形状稳定效应的结果。数据在低频时表现出这些相同的功能形式，因此它们无法从风中接收到大量的本地输入。该结果表明，光谱形状几乎完全由非线性交互控制，输入和耗散项的重要性较小。该结果表明，输入和耗散对确定波场中的能量总量很重要，但在确定光谱形状方面似乎只起次要作用。

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