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This study integrates multi-source topographic data spanning 1979–2021 for the North Branch of the Yangtze River estuary. Building on the hypothesis of minimum channel activity, we refine traditional cross-section stability parameters and develop a spatiotemporally resolved index for channel-migration variability. Since 2010, the northern deep-channel cross-section has exhibited migration amplitudes exceeding 5%, with an intensifying trend, indicating ongoing dynamic adjustment. In contrast, the southern deep-channel cross-section has remained within a 5% migration envelope, showing annually stable amplitudes and thus dynamic stability. Comparative analysis of the new index against hydrodynamic drivers—runoff, sediment flux, and tidal asymmetry—reveals significantly stronger correlations than those achieved with conventional parameters. These findings elucidate a spatially heterogeneous evolution of the North Branch: the northern deep channel displays markedly higher sensitivity to basin-estuary flux variables (runoff and sediment discharge) than its southern counterpart, underscoring pronounced spatial differentiation in the coupled tide-river control of sediment dynamics.

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Study on Stability Mechanisms and Morphodynamic Responses of Distributary Tidal Inlets with Shoal Barriers

  • 会议论文

  • 发表日期：

    2026年

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  • Gongjin Zhang,
  • Mingxia Qian,
  • Wei Ding

摘要

This study integrates multi-source topographic data spanning 1979–2021 for the North Branch of the Yangtze River estuary. Building on the hypothesis of minimum channel activity, we refine traditional cross-section stability parameters and develop a spatiotemporally resolved index for channel-migration variability. Since 2010, the northern deep-channel cross-section has exhibited migration amplitudes exceeding 5%, with an intensifying trend, indicating ongoing dynamic adjustment. In contrast, the southern deep-channel cross-section has remained within a 5% migration envelope, showing annually stable amplitudes and thus dynamic stability. Comparative analysis of the new index against hydrodynamic drivers—runoff, sediment flux, and tidal asymmetry—reveals significantly stronger correlations than those achieved with conventional parameters. These findings elucidate a spatially heterogeneous evolution of the North Branch: the northern deep channel displays markedly higher sensitivity to basin-estuary flux variables (runoff and sediment discharge) than its southern counterpart, underscoring pronounced spatial differentiation in the coupled tide-river control of sediment dynamics.