Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River

Jianfeng WANG; Fei YU; Qiang REN; Chuanjie WEI

doi:10.1007/s00343-020-0008-7

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Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River

Physics | Updated：2023-04-27

- Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River
- Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River
- 海洋湖沼学报（英文） 2020年38卷第4期页码：1138-1152
- Affiliations：
  
  1.CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  3.Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  4.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  YU Fei, yuf@qdio.ac.cn
- Funds：
  
  the National Natural Science Foundation of China (NSFC)(41706012);the National Key Research and Development Program of China(2017YFC1403401);the National Natural Science Foundation of China(41421005);the NSFC-Shandong Joint Fund for Marine Science Research Centers(U1406401);the Strategic Priority Research Program of Chinese Academy of Sciences(XDA11020301);© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
- DOI：10.1007/s00343-020-0008-7
  中图分类号：
- 收稿：2020-01-07，
  
  录用：2020-3-1，
  
  网络首发：2020-04-09，
  
  纸质出版：2020-07
- Accepted：
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Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River[J]. 海洋湖沼学报（英文）, 2020,38(4):1138-1152.

Jianfeng WANG, Fei YU, Qiang REN, et al. Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1138-1152.
Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River[J]. 海洋湖沼学报（英文）, 2020,38(4):1138-1152. DOI： 10.1007/s00343-020-0008-7.

Jianfeng WANG, Fei YU, Qiang REN, et al. Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1138-1152. DOI： 10.1007/s00343-020-0008-7.

摘要

Abstract

Based on field hydrological

microstructural

and shipboard Acoustic Doppler Current Profiler data

we quantified the spatial and temporal variability of turbulent mixing in the near-field Changjiang (Yangtze) River plume. The surface dissipation rate (

) changed by three orders of magnitude from near-field (10

-4

W/kg) to far-field (10

-7

W/kg) plumes

indicating a decrease with distance from the river mouth. Below the river plume

changed with depth to 10

-8

W/kg

and increased to 10

-6

W/kg at the layer where the Taiwan Warm Current (TWC) intruded. Thus

in the near-field plume showed three layers:surface layer in the river plume

middle layer

and lower TWC layer. In the river plume

the strongest

and turbulent diffusivity (

) were greater than 10

-4

W/kg and 10

-2

respectively

during strong ebb tides. A three-orders-of-magnitude change in

and

was observed in the tidal cycle. The depth of the halocline changed with tidal cycles

and stratification (

) varied by one order of magnitude. Stratification in the TWC layer followed the distribution of the halocline

which is opposite to the dissipation structure. Tidal currents led to intrusion and turbulent mixing in the TWC layer. During ebb tides

and

were as strong as those measured in the river plume

but did not last as long. The structure of the velocity shear was similar to the dissipation rate in both the river plume and TWC layer

whereas the velocity shear in the TWC layer did not match the stratification structure. In the high dissipation rate area

the gradient Richardson number was smaller than the critical value (

1/4). The

structure was consistent with shear and dissipation distributions

indicating that turbulent mixing in the near-field plume was controlled by a combination of shear induced by the discharged river flow and tidal current.

关键词

Keywords

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