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Influence of River Discharge on the Transport of the Saltwater Group from the North Branch in the Yangtze River Estuary

Author

Listed:
  • Zhi Xu

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    China Three Gorges Corporation, Beijing 100038, China
    Department of Hyraulic Engineering, Tsinghua University, Beijing 100084, China)

  • Jing Ma

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

  • Hao Wang

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Department of Hyraulic Engineering, Tsinghua University, Beijing 100084, China)

  • Jianshi Zhao

    (Department of Hyraulic Engineering, Tsinghua University, Beijing 100084, China)

Abstract

The Yangtze River Estuary (YRE) is the largest estuary in China. Recently, due to the increase of extent and frequency, saltwater intrusion has received more and more attention. In this paper, with the adoption of hydrodynamic and salinity transport mode, quantitative research of the influence of river discharge to the North Branch (NB) of the Yangtze River on the saltwater group migration law is conducted. Tide and salinity data are used to validate the model effectively. In different paths, the changes in flow and the movement of the saltwater group are similar. The saltwater group starts to move downward from the sixth day. In the staged downward movement, the larger the runoff volume, the further the distance of the core of the saltwater group, and converges to around 90 km gradually. At different flow rates, the relationship between the average location of each waterway saltwater group core tide cycle and time is consistent with the Gompertz model, and its parameters had a nonlinear relationship with the flow rate. A function is constructed to calculate the length and time of the saltwater group migration. As the flow rate increases, the faster the core of the saltwater group reaches the entrance. The downwards movement takes 3–8 days. Quantitative research on the influence of the saltwater spilling from NB to the three major reservoirs in the South Branch (SB)is conducted. The simulation results are consistent with the function calculation. River discharge has a direct impact on saltwater transport and diffusion in the YRE.

Suggested Citation

  • Zhi Xu & Jing Ma & Hao Wang & Jianshi Zhao, 2020. "Influence of River Discharge on the Transport of the Saltwater Group from the North Branch in the Yangtze River Estuary," IJERPH, MDPI, vol. 17(24), pages 1-21, December.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:24:p:9156-:d:458566
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    References listed on IDEAS

    as
    1. Zhi Xu & Jing Ma & Yajie Hu, 2019. "Saltwater Intrusion Function and Preliminary Application in the Yangtze River Estuary, China," IJERPH, MDPI, vol. 16(1), pages 1-19, January.
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    Cited by:

    1. Ziyuan Wang & Yiqing Guan & Danrong Zhang & Alain Niyongabo & Haowen Ming & Zhiming Yu & Yihui Huang, 2023. "Research on Seawater Intrusion Suppression Scheme of Minjiang River Estuary," IJERPH, MDPI, vol. 20(6), pages 1-15, March.

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    1. Ziyuan Wang & Yiqing Guan & Danrong Zhang & Alain Niyongabo & Haowen Ming & Zhiming Yu & Yihui Huang, 2023. "Research on Seawater Intrusion Suppression Scheme of Minjiang River Estuary," IJERPH, MDPI, vol. 20(6), pages 1-15, March.

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