Vertical structure of tidal currents in the Xuliujing Section of Changjiang River Estuary

Zhigao Chen; Ya Ban; Xiaoye Chen; Dajun Li; Shengping Wang

doi:10.1007/s13131-021-1976-y

Volume 42 Issue 2

Feb. 2023

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Zhigao Chen, Ya Ban, Xiaoye Chen, Dajun Li, Shengping Wang. Vertical structure of tidal currents in the Xuliujing Section of Changjiang River Estuary[J]. Acta Oceanologica Sinica, 2023, 42(2): 44-55. doi: 10.1007/s13131-021-1976-y

Citation:

Zhigao Chen, Ya Ban, Xiaoye Chen, Dajun Li, Shengping Wang. Vertical structure of tidal currents in the Xuliujing Section of Changjiang River Estuary[J]. Acta Oceanologica Sinica, 2023, 42(2): 44-55. doi: 10.1007/s13131-021-1976-y

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Vertical structure of tidal currents in the Xuliujing Section of Changjiang River Estuary

doi: 10.1007/s13131-021-1976-y

Zhigao Chen^{1, 2, 3, 4
,
,},
Ya Ban²,
Xiaoye Chen¹,
Dajun Li¹,
Shengping Wang^{1, 4
,
,}

1.
Faculty of Geomatics, East China University of Technology, Nanchang 330013, China
2.
Chongqing Academy of Metrology and Quality Inspection, Chongqing 401120, China
3.
Nanjing White Shark Surveying and Mapping Technology Co., Ltd, Nanjing 210038, China
4.
Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China

Funds: The National Natural Science Foundation of China under contract Nos 41806114 and 42266006; the Jiangxi Provincial Natural Science Foundation under contract Nos 20202ACBL214019, 20181BAB216031 and 20212BBE53031; the Technological Innovation and Application Development in Chongqing under contract No. CSTB2022TIAD-GPX0016; the Incentive and Guidance Project of Scientific Research Performance for Scientific Research Institutes in Chongqing under contract No. cstc2021jxjl120017; the Open Fund of the Key Laboratory of Marine Environmental Survey Technology and Application of Ministry of Natural Resources under contract Nos MESTA-2020-A002 and MESTA-2021-B001.

More Information

Corresponding author: E-mail: 531214372@qq.com; shpwang@ecut.edu.cn; shpwang@ecut.edu.cn.
Received Date: 2021-06-26
Accepted Date: 2021-11-14

Available Online: 2021-12-23

Publish Date: 2023-02-25

Abstract

Abstract

Three long-term fixed acoustic Doppler current profilers were first used for investigating the vertical structure of tidal currents in Xuliujing Section of Changjiang River Estuary. Moreover, three different periods (spring, summer and fall) were also considered for investigating seasonal variations. The semi-diurnal tides were the most energetic, with along-channel speed of up to 80 cm/s for M₂ constituent, which dominates at all stations with percent energy up to 65%–75% during seasons. The shape of tidal ellipses of the most energetic semi-diurnal constituent M₂ showed obvious polarization of the flow paralleling to the riverbank, with the minor semi-axis being generally less than 20% of the major one. The maximum velocity of mean current is appeared in top layers at all the three stations, and the velocity decreased with the depth. The seasonal variations of direction are also observed, which is probably caused by complex local topography since the erosion and deposition in riverbed. Observed vertical variation of four parameters of M₂ ellipses, agreed well with the optimally fit frictional solutions in top and middle layers. However, there was an obvious difference between frictional model and observed data in the lower water column. Discrepancies are probably on account of stratification, which strengthens in summer and fall due to the freshening influence of the Changjiang River Estuary outflow.
- vertical structure,
- seasonal variations,
- tidal current,
- mean current,
- acoustic Doppler current profiler,
- Changjiang River Estuary

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References(31)

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