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<p>The downstream region of the Yangtze River in China experiences tidal influences, with most tributary inlets regulated by hydraulic hubs that control water diversion and drainage. The cross-sectional characteristics of these rivers under intermittent diversion and drainage remain uncertain due to various boundary conditions, including tidal fluctuations from the Yangtze River, hydraulic hub operations, and tributary water levels. This study examines the Yanglintang River as a case study, utilizing a two-dimensional water-sediment numerical model to analyze the response of river cross-sections under varying diversion-to-drainage ratios. The findings demonstrate that river cross-sections transform from a regular trapezoidal shape to a pot-bottom configuration, achieving equilibrium within 2 to 3 years under the influence of water diversion and drainage. The operational duration of water diversion and drainage shows minimal impact on river cross-sectional morphology, with bed scouring reaching approximately 10 cm when the operational duration doubles. However, the flow rate of water diversion-drainage operations emerges as the primary factor controlling river cross-sectional morphology, resulting in bed scouring magnitude of approximately 1 m under doubled flow rate conditions.</p>

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Response of River Cross-Sectional Characteristics to Tidally Driven Diversion-Drainage Regulation

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Shou-qian Li,
  • Rui Hu,
  • Rui Zhang,
  • Zhi-li Wang,
  • Huai-xiang Liu,
  • Shi-huan Zhou,
  • Xian-zi Xu

摘要

The downstream region of the Yangtze River in China experiences tidal influences, with most tributary inlets regulated by hydraulic hubs that control water diversion and drainage. The cross-sectional characteristics of these rivers under intermittent diversion and drainage remain uncertain due to various boundary conditions, including tidal fluctuations from the Yangtze River, hydraulic hub operations, and tributary water levels. This study examines the Yanglintang River as a case study, utilizing a two-dimensional water-sediment numerical model to analyze the response of river cross-sections under varying diversion-to-drainage ratios. The findings demonstrate that river cross-sections transform from a regular trapezoidal shape to a pot-bottom configuration, achieving equilibrium within 2 to 3 years under the influence of water diversion and drainage. The operational duration of water diversion and drainage shows minimal impact on river cross-sectional morphology, with bed scouring reaching approximately 10 cm when the operational duration doubles. However, the flow rate of water diversion-drainage operations emerges as the primary factor controlling river cross-sectional morphology, resulting in bed scouring magnitude of approximately 1 m under doubled flow rate conditions.