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利用大戢山和吕泗两水位站(1978—1981)4年的观测资料讨论了长江口南、北两岸水位的低频变化。谱分析显示,两岸的水位低频变化均以年周期为主,但两岸间的水位差却以半年周期为主。结合浙江近岸底层34×10~(-3)等盐线的北伸位置和苏澳-与那国岛断面上黑潮净流量的季节性变化规律,认为半年振动周期是东海海水运动的重要特征之一。
Based on the 4-year observation data of Dadushan and Lusi water stations (1978-1981), the low-frequency changes of the water level across the south and north of the Changjiang Estuary were discussed. Spectrum analysis shows that the low-frequency changes of the water level across the Strait are mainly annual cycles, but the water level difference between the two sides is dominated by a half-year cycle. According to the seasonal variation of north extension of 34 × 10 -3 salt line in the near-shore of Zhejiang Province and the net flow of Kuroshio in the section of Su-O-NaNuo Island, it is considered that the six-year vibration period is an important characteristic of the seawater movement in the East China Sea one.