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首页> 外文期刊>Journal of Physical Oceanography >On Detection of a Wave Age Dependency for the Sea Surface Roughness
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On Detection of a Wave Age Dependency for the Sea Surface Roughness

机译：关于海浪粗糙度的波龄依赖性的检测

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The wave age dependency of the nondimensional sea surface roughness (also called the Charnock parameter) is investigated with data from the new field measurement program at Rodsand in the Danish Baltic Sea. An increasing Charnock parameter with inverse wave age is found, which can be described by a power-law relation. Friction velocity is a common quantity in both the Charnock parameter and wave age. Thus self-correlation effects are unavoidable in the relation between them. The significance of self-correlation is investigated by employing an artificial "dataset" with randomized wave parameters. It is found that self-correlation severely influences the relation. For the R0dsand dataset the difference between real and randomized "data" was found to be within the measurement uncertainty. By using a small subset of the data it was found that the importance of self-correlation increases for a narrower range of wave age values. This supports the conclusion of Johnson et al. that because of the scatter and self-correlation problems the coefficients of the power-law relation can only be obtained from the analysis of an aggregated dataset with a wide wave age range combining measurements from several sites. The dependency between wave age and sea roughness has been discussed extensively in the literature with different and sometimes conflicting results. A wide range of coefficients has been found for the power-law relation between the Charnock parameter and wave age for different datasets. It is shown that self-correlation contributes to such differences, since it depends on the range of wave age values present in the datasets. Also, data are often selected for rough flow conditions with the Reynolds roughness number. It is shown that for datasets with large scatter this can lead to misleading results with regard to the relationship between wave age and Charnock parameter. Two different methods to overcome this problem are presented.
机译：利用来自丹麦波罗的海罗德桑德（Rodsand）的新现场测量程序的数据，研究了无量纲海面粗糙度（也称为Charnock参数）与波浪年龄的相关性。发现具有随波龄增加的夏诺克参数增加，这可以通过幂律关系来描述。摩擦速度是夏诺克参数和波浪时代的共同量。因此，在它们之间的关系中，自相关效应是不可避免的。通过使用带有随机波参数的人工“数据集”来研究自相关的重要性。发现自相关严重影响该关系。对于R0dsand数据集，发现真实和随机“数据”之间的差异在测量不确定性之内。通过使用一小部分数据，发现自相关性的重要性对于较窄的波动年龄值范围会增加。这支持了Johnson等人的结论。由于散射和自相关的问题，幂律关系的系数只能从结合了多个地点的测量结果的宽波龄范围的聚合数据集的分析中获得。波浪年龄与海面粗糙度之间的相关性已在文献中进行了广泛讨论，但结果却有所不同，有时甚至是相互矛盾的。对于不同数据集，夏诺克参数和波龄之间的幂律关系已经发现了广泛的系数。结果表明，自相关会导致这种差异，因为它取决于数据集中存在的波浪年龄值的范围。而且，通常使用雷诺粗糙度数为粗糙流动条件选择数据。结果表明，对于散布较大的数据集，这可能导致关于波龄和夏诺克参数之间关系的误导性结果。提出了两种解决该问题的方法。

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