Journal of Marine Sciences ›› 2022, Vol. 40 ›› Issue (1): 12-20.DOI: 10.3969/j.issn.1001-909X.2022.01.002

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Study on tide and tidal current near the Changjiang (Yangtze River) Estuary based on observational data

There is strong tide in the Changjiang (Yangtze River) Estuary and its adjacent area. Except for the coast area, there is a lack of longterm tide level and tidal current data in the offshore area. Long time series of water level observation data was used in this study, and the results reveal that the tidal type in the Changjiang Estuary is a regular semidiurnal tide, with a significant shallow water division in the nearshore area; the M2 division is the most significant semidiurnal tide, and the amplitude tends to increase from the open sea in the east to the shallow water or island group at the mouth of Hangzhou Bay in the west. The M2 tidal current is the most significant semidiurnal tidal current, and the rotating tide is the most significant semidiurnal tide. The two stations to the south of the Changjiang mouth are rotating counterclockwise, while the stations to the east of the mouth are rotating clockwise. The vertical structure of the tide has significant spatial differences, the ellipticity of the M2 tidal current is mostly negative, the ellipticity of the M2 tidal current, the direction and the arrival time of maximum velocity all vary significantly with depth.#br#

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  1. 1.State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China; 
    2.Second Institute of
     Oceanography, MNR, Hangzhou 310012, China; 
    3.Observation and Research Station of Yangtze River Delta Marine
     Ecosystems, MNR, Zhoushan 316021, China; 
    4.Fourth Institute of Oceanography, MNR, Beihai 53600, China; 
    5.Institute of Polar and Ocean Technology, SIO, MNR, Hangzhou 310012, China
  • Online:2022-03-15 Published:2022-03-15

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Abstract: There is strong tide in the Changjiang (Yangtze River) Estuary and its adjacent area. Except for the coast area, there is a lack of longterm tide level and tidal current data in the offshore area. Long time series of water level observation data was used in this study, and the results reveal that the tidal type in the Changjiang Estuary is a regular semidiurnal tide, with a significant shallow water division in the nearshore area; the M2 division is the most significant semidiurnal tide, and the amplitude tends to increase from the open sea in the east to the shallow water or island group at the mouth of Hangzhou Bay in the west. The M2 tidal current is the most significant semidiurnal tidal current, and the rotating tide is the most significant semidiurnal tide. The two stations to the south of the Changjiang mouth are rotating counterclockwise, while the stations to the east of the mouth are rotating clockwise. The vertical structure of the tide has significant spatial differences, the ellipticity of the M2 tidal current is mostly negative, the ellipticity of the M2 tidal current, the direction and the arrival time of maximum velocity all vary significantly with depth.


Key words: tide, tidal current, vertical structure, the Changjiang (Yangtze River) Estuary

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