Estuarine dynamics is influenced not only by upstream human activities but also significantly by large-scale estuarine engineering projects (LSEPs). In recent decades, multiple LSEPs have been constructed in the Yangtze Estuary, and the impacts of single project have been well studied, but their cumulative impacts remain elusive. This study investigates Yangtze Estuary morphological changes from 1958 to 2020 by chart bathymetric data. Results reveal a shift from rapid accretion (1958–1983) to moderate accretion (1983–2011), and then to moderate erosion (2011–2020), almost coeval with declining fluvial sediment discharge in response to the upstream human disturbances. Moreover, increasing LSEPs have complexified estuarine erosion and deposition patterns over local to regional scales in the past two decades.

中文翻译：

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人类活动对高度蚀变长江口水文沉积物动力学和形态动力学的累积影响


河口动力学不仅受到上游人类活动的影响，还受到大规模河口工程项目 （LSEP） 的显著影响。近几十年来，长江口建设了多个 LSEP，单个项目的影响得到了很好的研究，但它们的累积影响仍然难以捉摸。本研究通过图表测深数据调查了 1958 年至 2020 年长江口的形态变化。结果显示，从快速吸积（1958-1983 年）转变为中度吸积（1983-2011 年），然后转变为中度侵蚀（2011-2020 年），几乎与河流沉积物排放量下降同时代，以响应上游人类干扰。此外，在过去二十年中，越来越多的 LSEP 使局部到区域尺度的河口侵蚀和沉积模式复杂化。