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A Numerical Study of Hydrodynamic Processes and Flood Mitigation in a Large River-lake System

Author

Listed:
  • Hongwu Tang

    (Hohai University)

  • Hao Cao

    (Hohai University)

  • Saiyu Yuan

    (Hohai University)

  • Yang Xiao

    (Hohai University)

  • Chenyu Jiang

    (Hohai University)

  • Carlo Gualtieri

    (University of Naples Federico II)

Abstract

Floods out of all other water problems cause very large damages in China. Previous flood management plans mainly focused on a single river by controlling its water level and conveyance capacity, while research on mitigation solutions to flooding issues in river-lake systems is scarce. This study considers the Huai River - Lake Hongze system, which is one of the largest river-lake systems in China. Very large damages associated with small floods are frequently observed in this river-lake system, although a series of flood management measures have been implemented in the Huai River Basin since the middle of the last century. An unstructured-grid finite-volume numerical model was applied to simulate hydrodynamic processes in this system, which is characterized by discrepant spatial scales between these two types of water bodies. It is found that the lake affects the upstream river flooding, but lowering the lake level would have limited effects that would be rapidly impaired by the sharp meander bend connecting the river and the lake. The artificial cutoff of this intensively-embanked bend has great potential in reducing the river stage and flood damages, as the construction of a diversion channel would shorten the flow path and increase the hydraulic gradient. This study extends the current knowledge about the hydrodynamics of river-lake systems and is beneficial to flood mitigation strategies for similar systems.

Suggested Citation

  • Hongwu Tang & Hao Cao & Saiyu Yuan & Yang Xiao & Chenyu Jiang & Carlo Gualtieri, 2020. "A Numerical Study of Hydrodynamic Processes and Flood Mitigation in a Large River-lake System," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(12), pages 3739-3760, September.
    • Handle: RePEc:spr:waterr:v:34:y:2020:i:12:d:10.1007_s11269-020-02628-y
    DOI: 10.1007/s11269-020-02628-y
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    References listed on IDEAS

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    Cited by:

    1. Bojun Liu & Jun Xia & Feilin Zhu & Jin Quan & Hao Wang, 2021. "Response of Hydrodynamics and Water-quality Conditions to Climate Change in a Shallow Lake," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(14), pages 4961-4976, November.

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