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Using the current measurement data obtained from the two investigations in the southern East China Sea in June-July of 1984 and January of 1985, the values of rotating spectra and ellipse elements are calculated by Gonella’s method. The results show that the semi-diurnal tidal current dominates in this area, followed by the diurnal one. The isoplethic spectra of the currents run in a direction from NW to SE, and in the longshore area, they are nearly parallel to the coast. The values of the spectra are much larger in the south and north portions of the observed area, and much smaller in the middle region and they are the largest in the north of the Taiwan Strait. The values decrease with the increase of the depth. It is found that there is a low frequency current with a period of 8 days. The consistence between the tidal current system and tidal wave system is discussed.
Using the current measurement data obtained from the two investigations in the southern East China Sea in June-July of 1984 and January of 1985, the values of rotating spectra and ellipse elements are calculated by Gonella’s method. The results show that the semi-diurnal tidal The isoplethic spectra of the currents run in a direction from NW to SE, and in the longshore area, they are nearly parallel to the coast. The values of the spectra are much larger in the south and north portions of the observed area, and much smaller in the middle region and they are the largest in the north of the Taiwan Strait. The values decrease with the increase of the depth. It is found that there is a low frequency current with a period of 8 days. The consistence of the tidal current system and tidal wave system is discussed.