【摘要】 利用丁字湾近岸海域2021年的最新观测资料，研究了潮汐、潮流和余流的基本特征和变化规律。得出如下结论：潮汐为正规半日潮，最大潮差405 cm,最小潮差69 cm,平均潮差248 cm,涨潮历时小于落潮历时。潮流为规则半日浅海潮流，最大涨潮流流速为67 cm/s,最大落潮流流速为72 cm/s。涨潮流历时小于落潮流历时。垂向来看，表层流速最大，中层次之，底层最小。海流的旋转谱分析的结果显示M₂分潮的谱峰值最高，运动形式为逆时针旋转流。余流，整体余流流速小于10 cm/s,表层余流最大，中层次之，底层最小。观测期间，长周期的风向和余流流向相反，因此风不是余流的控制因素。更多还原

【Abstract】 Based on the latest observation data of Dingzi Bay in 2021, the basic characteristics of tide, current and residual current were studied. The type of tide is regularly semidiurnal. The maximum tide is 405 cm, the minimum tide is 69 cm, and the averaged tide is 248 cm. The duration of high tide is less than that of low tide. The tidal current is regularly semidiurnal. The maximum flood current velocity is 67cm/s and the maximum ebb current velocity is 72 cm/s. The duration of rising tide current is less than that of falling tide current. The current velocity decreased from top to bottom. The rotary spectrum analysis of the current showed that the spectral peak of M2 tidal constituent is the highest, and the motion form is counterclockwise. The amplitude of residual current is less than 10 cm/s, and decreases from top to bottom. In the observation period, the wind direction of long period is opposite to the direction of residual current. The wind is not the controlling factor of residual current.更多还原