Understanding the mass transfer between surface and subsurface water is essential in the fluvial environment. Transport across the sediment–water interface (SWI) can be strongly influenced by pore-scale vortices and coherent turbulent structures (sweep and ejection) near the interface. However, the functions of these hydrodynamic structures over the exchange at the interface and pore water movement in the bed are still unclear. In this paper, the pore-scale flow and transport across the SWI under dispersive and turbulent regimes were studied. The results show that pore-scale vortices are the main hydrodynamic form at the SWI in dispersive regimes, creating a transition layer and impeding interfacial transport. Periodic sweep and ejection prevail in turbulent regimes, which alter the structures of pore scale vortices, enhance interfacial transport, generate periodic pressure eruptions at the interface, and pulse the pore water to move vertically and periodically in the bed. Different forms of the dominant hydrodynamics structures near the interface will affect the residence time and trajectories of solutes in the bed. In dispersive regimes, the residence time of solutes exhibits a positive correlation with the Reynolds number due to the increasing penetration of solutes, while, in turbulent regimes, this correlation turns negative because of the unchanged penetration depth of solutes. The mechanism demonstration from numerical simulations clarifies the functions of pore-scale vortices and coherent turbulent structures on mass transfer between the surface and subsurface water, which can enhance the understanding of the role of sediments in the aquatic ecosystem.
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December 2021
Research Article|
December 16 2021
A pore-scale study of flow and transport across the sediment–water interface: From dispersive to turbulent regimes
Yilin Chen (陈奕林);
Yilin Chen (陈奕林)
1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University
, Nanjing, China
2
Changjiang Institute of Survey, Planning, Design and Research
, Wuhan, China
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Guangqiu Jin (金光球)
;
Guangqiu Jin (金光球)
a)
1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University
, Nanjing, China
3
College of Water Conservancy and Hydropower Engineering, Hohai University
, Nanjing, China
a)Author to whom all correspondence should be addressed: jingq@hhu.edu.cn. Tel.: +8625837125
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Pei Zhang (张沛);
Pei Zhang (张沛)
1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University
, Nanjing, China
4
School of Engineering, Westlake University
, Hangzhou, China
5
Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KlaCER), School of Engineering, Westlake University
, Hangzhou, China
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Qihao Jiang (姜启豪);
Qihao Jiang (姜启豪)
1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University
, Nanjing, China
6
College of Agricultural Science and Engineering, Hohai University
, Nanjing, China
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Silin Wu (吴思麟);
Silin Wu (吴思麟)
7
School of Architecture and Civil Engineering, Jiangsu University of Science and Technology
, Zhenjiang, 212100, China
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Sergio Andres Galindo Torres
;
Sergio Andres Galindo Torres
4
School of Engineering, Westlake University
, Hangzhou, China
5
Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KlaCER), School of Engineering, Westlake University
, Hangzhou, China
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Ling Li (李凌)
Ling Li (李凌)
4
School of Engineering, Westlake University
, Hangzhou, China
5
Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KlaCER), School of Engineering, Westlake University
, Hangzhou, China
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a)Author to whom all correspondence should be addressed: jingq@hhu.edu.cn. Tel.: +8625837125
Physics of Fluids 33, 126601 (2021)
Article history
Received:
July 22 2021
Accepted:
November 29 2021
Citation
Yilin Chen, Guangqiu Jin, Pei Zhang, Qihao Jiang, Silin Wu, Sergio Andres Galindo Torres, Ling Li; A pore-scale study of flow and transport across the sediment–water interface: From dispersive to turbulent regimes. Physics of Fluids 1 December 2021; 33 (12): 126601. https://doi.org/10.1063/5.0064350
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