Morphological evolution of estuarine channels influenced by multiple anthropogenic stresses: A case study of the North Channel, yYangtze estuary, China

Zheng Shuwei; Cheng Heqing; Lv Jianshu; Li Zijun; Zhou Liang

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Morphological evolution of estuarine channels influenced by multiple anthropogenic stresses: A case study of the North Channel, yYangtze estuary, China

机译：多发性胁迫影响的河口途径的形态演化 - 以北河，Yyangtze河口北京

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The Construction of mega-dams has attracted worldwide attention due to their impacts on channel scouring from downstream regions to estuaries. However, the impacts of dams and near-end engineering on the evolution of large alluvial estuarine channels are unknown. In this study, the morphological evolutionary process and response regime of the North Channel (NC) in the Yangtze estuary was examined between 1986 and 2016 by using hydrology, multibeam echo sounding and historical bathymetry datasets. The results showed that the NC exhibited overall erosion with a total volume of 9.09 x 10(8) m(3) over the past 30 years. We concluded that sediment load reduction in the river basin was the main reason for channel scouring. However, the short-term influence of near-end engineering on the local channel evolution process could not be ignored. For example, the construction of the north-south channel bifurcation project resulted in slight siltation of the NC with a total volume of 0.12 x 10(8) m(3) from 2002 to 2007 despite the sediment load decreasing from 3.4 x 10(8) t to 1.8 x 10(8) t since the closure of the Three Gorges Dam (TGD). Furthermore, after construction (2007-2016) of the Qing-caosha Reservoir, the largest reservoir in the Yangtze estuary, the NC experienced extensive scouring near the reservoir and limited morphologic changes to the margin channel far from the reservoir. The maximum scouring depth near the reservoir reached -13.5 m. In terms of the scour rate, the value of the average annual scour depth was 23-24 times the riverbed erosion rate caused by sediment load reduction. Therefore, a re-evaluation of the unexpected impacts of near-end engineering on the local Yangtze estuarine channels is urgently needed.

机译：由于它们对河口下游地区的渠道冲突的影响，巨型水坝的建设引起了全世界的关注。然而，大坝和近端工程对大型冲积河口通道的演变的影响是未知的。在这项研究中，通过使用水文，多阵容回声探测和历史沐浴间数据集在1986年至2016年期间审查了长江河口北京北京河口（NC）的形态进化过程和响应制度。结果表明，在过去30年中，NC表现出总体积的总体积为9.09×10（8）米（3）。我们得出结论，河流盆地的沉积物减少是渠道擦洗的主要原因。但是，近端工程对地方渠道演化过程的短期影响无法忽视。例如，南北通道分叉项目的构建导致NC的轻微淤积，总体积为0.12 x 10（8）（3），尽管沉积物负荷从3.4 x 10减少（8自三峡大坝（TGD）关闭以来，T至1.8 x 10（8）吨。此外，在清理河楼建设（2007-2016）之后，长江河口最大的水库，NC在储层附近越来越彻底擦洗，与水库远离水库的边缘通道有限的形态变化。储存器附近的最大冲洗深度达到-13.5米。在洗涤率方面，平均年度冲刷深度的值为沉积物减少沉积物侵蚀率为23-24倍。因此，迫切需要对近端工程对局部长江河口通道的意外影响的重新评估是迫切需要的。

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来源
《Estuarine Coastal and Shelf Science》 |2021年第5期|107075.1-107075.12|共12页
作者
Zheng Shuwei; Cheng Heqing; Lv Jianshu; Li Zijun; Zhou Liang;
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作者单位

Shandong Normal Univ Coll Geog & Environm Jinan 250358 Shandong Peoples R China|Jiangsu Normal Univ Sch Geog Geomat & Planning Xuzhou 221116 Jiangsu Peoples R China;

East China Normal Univ State Key Lab Estuarine & Coastal Res Shanghai 200062 Peoples R China;

Shandong Normal Univ Coll Geog & Environm Jinan 250358 Shandong Peoples R China;

Shandong Normal Univ Coll Geog & Environm Jinan 250358 Shandong Peoples R China;

Jiangsu Normal Univ Sch Geog Geomat & Planning Xuzhou 221116 Jiangsu Peoples R China|East China Normal Univ State Key Lab Estuarine & Coastal Res Shanghai 200062 Peoples R China;

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正文语种 eng
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Morphological evolution; Anthropogenic stresses; Responding regime; Estuarine channel; Yangtze river;

机译：形态学进化;人为应力;响应政权;河口渠道;长江;

Morphological evolution of estuarine channels influenced by multiple anthropogenic stresses: A case study of the North Channel, yYangtze estuary, China

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