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本文利用日本东海大学在我国台湾—日本西表岛间的锚系测流资料,进行了调和分析,得出了各层潮流的调和常数、椭圆要素,分析了黑潮潮流的基本特征,并进行流速、温度、盐度的谱分析。结果表明,黑潮除有明显的中频潮振动外,还显著地存在着以数天乃至数十天为周期的各种低频振动。在最大熵谱分析中,经显著性周期检验,有不少谱峰已超过显著性水平,其中有的谱峰值为日潮振动的3—5倍,仅次于半日潮振动。此外,各层之间频域相关性分析表明,除半日潮为最大外,低频段上有的凝聚函数也较显著。
In this paper, we use the data of anchor system measured by Tokai University in Taiwan between China and Japan to conduct a harmonic analysis. The harmonic constants and ellipse elements of tidal currents are obtained, and the basic characteristics of the tidal current are analyzed. The flow rate , Temperature, salinity spectrum analysis. The results show that except for obvious mid-frequency tidal vibration, there are also significant low-frequency vibrations in the Kuroshio period of several days or even tens of days. In the maximum entropy spectrum analysis, significant periodicity tests have shown that many of the spectral peaks have exceeded the significance level. Some of the spectral peaks are 3-5 times of the daily tidal vibration, second only to the semi-diurnal tidal vibration. In addition, the frequency-domain correlation analysis between the layers shows that except the half-day tide is the largest, the cohesion function in the low frequency band is also significant.