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Saltwater Intrusion Function and Preliminary Application in the Yangtze River Estuary, China

Author

Listed:
  • Zhi Xu

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

  • Jing Ma

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

  • Yajie Hu

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

Abstract

More attention has been paid to saltwater-intrusion-related problems in recent years. In this research study, a saltwater intrusion function in the Yangtze River Estuary (YRE) was constructed based on the theory of the interactions between energy accumulation and impedance. A MIKE21 model was used to simulate the hydrodynamics of the YRE. Then, through the analysis of the relationships between the river discharge conditions, tidal ranges, and saltwater intrusion, it was determined that, under certain river discharge conditions, the tidal ranges and salinity levels at the stations in the southern branch (SB) of the YRE conformed to S-shaped curve characteristics. Also, the tidal ranges and salinity excessive area rate (SEAR) displayed similar characteristics. Furthermore, the river discharge conditions were also found to match the S-curve characteristics between the two aforementioned relationship features. Therefore, the saltwater intrusion function of the YRE was constructed based on the previously mentioned development rules. Also, the applied quantification methods were elaborated, and the values of the parameters were determined. As a result, the critical river discharge (more than 10,000 m 3 /s) was obtained, which could withstand large-scale saltwater intrusions. When the river discharge was greater than 30,000 m 3 /s, the area was considered to be basically without salt water intrusions, and the estuarine ecology was in an optimal state. The saltwater intrusion losses from 2005 to 2015 are also calculated. These findings have important reference value for water dispatching of the YRE in the dry season.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:1:p:118-:d:194949
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    References listed on IDEAS

    as
    1. Yang Yu & Peifang Wang & Chao Wang & Xun Wang & Bin Hu, 2018. "Assessment of the Multi-Objective Reservoir Operation for Maintaining the Turbidity Maximum Zone in the Yangtze River Estuary," IJERPH, MDPI, vol. 15(10), pages 1-19, September.
    2. Minjian Chen & Jing Ma & Yajie Hu & Fei Zhou & Jinxiu Li & Long Yan, 2015. "Is the S-shaped curve a general law? An application to evaluate the damage resulting from water-induced disasters," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 78(1), pages 497-515, August.
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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.
    2. 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.

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