Based on the observation of tidal currents at several stations conducted synchronically in winter and summer respectively, the vertical distribution of tidal currents in different seasons and tidal cycles were analyzed, and the vertical variation of tidal current types, ellipticity, maximum velocity, direction and arrival time were further analyzed by the tidal current elliptic factors calculated from the quasi-harmonic method. Results showed that the tide currents of each layer varied both vertically and seasonally. The currents at the surface were usually the strongest, while the currents in the bottom layer were relatively weaker, and the difference from the surface layer to the bottom layer in summer was more apparent than that in winter. The tidal currents were classified as regular semidiurnal tidal currents. The tidal types varied with the depth increasing, and the variation from the surface layer to the bottom layer in summer was greater than that in winter. With depth increasing, the maximum velocity was decreasing, which was more obvious in summer than that in winter, and the maximum current direction was rotating counterclockwise. The arrival time of maximum velocity at bottom was earlier than that at the upper layers, and the variation of diurnal tide was greater than that of semidiurnal tide.%根据连云港近岸海域夏冬季多站同步连续实测潮流资料,分析了不同季节、不同潮周期潮流垂向分布特征,并对实测潮流资料进行了准调和分析,进一步计算潮流椭圆要素,据此分析了潮流性质、潮流椭圆旋转率、最大流速流向及到达时间的垂向分布.结果表明,连云港近岸海域实测各层潮流在垂向上和季节上具有一定的差异,通常表层潮流最强,底层潮流较弱,夏季表底层大小差异比冬季明显.潮流性质属正规半日潮流,表征潮流性质的日潮流与半日潮流比值随水深的增加而变化,夏季表底层变化比冬季大.最大流速大小随深度增加而递减,夏季比冬季变化显著.最大流速方向随深度变化呈逆时针方向旋转.底层最大流速到达时间比上层早,日潮流比半日潮流变化大.
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