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A Two-Scale Approximation for Efficient Representation of Nonlinear Energy Transfers in a Wind Wave Spectrum. Part Ⅱ: Application to Observed Wave Spectra

机译：在风波谱中有效表示非线性能量转移的两尺度近似。第二部分：在观测波谱中的应用

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摘要

In Part I of this series, a new method for estimating nonlinear transfer rates in wind waves, based on a two-scale approximation (TSA) to the full Boltzmann integral (FBI) for quadruplet wave-wave interactions, was presented, and this new method was tested for idealized spectral data. Here, the focus is on comparisons of the TSA and the discrete interaction approximation (DIA) with the FBI for observed wave spectra from field measurements. Observed wave spectra are taken from a wave gauge array in Currituck Sound and a directional waverider off the coast near the Field Research Facility at Duck, North Carolina. Results show that the TSA compares much more favorably to the FBI than does the DIA, even for cases in which the parametric component of the formulation does not capture the spectral energy distribution very well. These results remain valid for the TSA estimates when the FBI results are significantly affected by the directional distribution of energy. It is also shown that although nonlinear transfers are substantially weaker in swell portions of the spectrum these interactions contribute significantly to the spectral evolution and net energy balance in long-distance swell propagation.
机译：在本系列的第一部分中，提出了一种新的估计风波非线性传输速率的方法，该方法基于四倍波波-波相互作用的完整玻尔兹曼积分（FBI）的两尺度近似（TSA）。该方法已针对理想光谱数据进行了测试。在这里，重点是比较TSA和离散相互作用近似（DIA）与FBI的比较，以便从现场测量中观察到的波谱。观测到的波谱是从北卡罗来纳州达克市野外研究设施附近海岸的Currituck Sound的一个波长表阵列和一个定向波谱仪获得的。结果表明，即使在配方的参数成分不能很好地捕获光谱能量分布的情况下，TSA与DIA相比也更适合FBI。当FBI结果受到能量方向分布的显着影响时，这些结果对于TSA估计仍然有效。还表明，尽管在频谱的膨胀部分非线性传递明显较弱，但这些相互作用对长距离膨胀传播中的频谱演化和净能量平衡有显着贡献。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第10期|2451-2476|共26页
  • 作者

    William Perrie; Donald T. Resio;

  • 作者单位

    Bedford Institute of Oceanography, Fisheries and Oceans Canada, Dartmouth, Nova Scotia, Canada Bedford Institute of Oceanography, 1 Challenger Dr., Dartmouth, NS B2Y 4A2, Canada;

    Coastal and Hydraulics Laboratory, Engineer Research and Development Center, Vicksburg, Mississippi;

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