Study on the impact of upstream discharge on saltwater intrusion distance in the Yangtze Estuary

Wang Hui; Huang Rui; Zhang Wei; Chen Zhong; Wang Xiaoguang; Li Hao; Zeng Jianfeng

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Wang Hui，Huang Rui，Zhang Wei, et al. Study on the impact of upstream discharge on saltwater intrusion distance in the Yangtze Estuary[J]. Haiyang Xuebao，2025, 47(x)：1–11

Citation:

Wang Hui，Huang Rui，Zhang Wei, et al. Study on the impact of upstream discharge on saltwater intrusion distance in the Yangtze Estuary[J]. Haiyang Xuebao，2025, 47(x)：1–11

Citation:

Wang Hui，Huang Rui，Zhang Wei, et al. Study on the impact of upstream discharge on saltwater intrusion distance in the Yangtze Estuary[J]. Haiyang Xuebao，2025, 47(x)：1–11

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Study on the impact of upstream discharge on saltwater intrusion distance in the Yangtze Estuary

Wang Hui^{1, 2
,},
Huang Rui^{1, 2
,
,},
Zhang Wei^{1, 2},
Chen Zhong³,
Wang Xiaoguang^{1, 2},
Li Hao²,
Zeng Jianfeng³

1.
The National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210024, China
2.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
3.
Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China

Received Date: 2024-11-06
Available Online: 2025-01-09

Abstract

Abstract

Saline water intrusion at the Yangtze River Estuary severely affects the security of upstream water supply, agricultural irrigation, and ecological environmental health. The distance of saline water intrusion upstream, influenced by the interaction between runoff and tidal forces, has received considerable attention. However, research on the extent of this intrusion under the influence of the runoff-tide interaction remains insufficient.This paper establishes a three-dimensional hydrodynamic and salinity mathematical model of the Yangtze River Estuary using the MIKE 3 hydrodynamic model. The model is validated against field measurements of water levels, flow velocities, flow directions, and salinity from the Yangtze River Estuary in 2016. The validation results show a good agreement between the simulated and measured values, indicating that the three-dimensional hydrodynamic and salinity mathematical model of the Yangtze River Estuary established in this study can effectively simulate the hydrodynamic and salinity characteristics in the vicinity of the estuary.To investigate the impact of upstream runoff on the extent of saltwater intrusion in the Yangtze River Estuary, this study sets up eight different flow rates ranging from 15,000 to 50,000 m³/s for the upstream section of the Yangtze River Estuary. The simulations focus on the effects of these varying upstream flow rates on the saltwater intrusion distances in three navigation channels: the South Branch-North Port, the South Branch-South Port-North Channel, and the South Branch-South Port-South Channel. The simulation results indicate that the degree of saltwater intrusion in all three channels is significantly dependent on tidal dynamics. During spring tides, when tidal forces are stronger, both the seawater backflow into the North Port and the saltwater intrusion into the North Branch are more pronounced compared to neap tides, resulting in longer saltwater intrusion distances overall during spring tides. When the upstream discharge is low, backflow from the North Branch also contributes to increased saltwater intrusion distances.The vertical distribution of salinity and stratification phenomena in the three channels under different flow conditions were also analyzed, and the relationships between upstream flow rates and the distances of saltwater intrusion in the three channels were established. The findings of this study provide valuable references for research on "salinity control and freshwater supplementation" in the Yangtze River Estuary, as well as studies on material transport.
- Yangtze River estuary,
- Numerical Simulation,
- Saline Water Intrusion,
- Upstream Intrusion Distance,
- Runoff

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References(39)

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