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Sedimentation and morphological changes at Yuantuojiao Point, estuary of the North Branch, Changjiang River

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Abstract

The North Branch, separated by the Chongming Island, was once the main channel in the estuary of the Changjiang River. Reclamation and a decrease in runoff to the North Branch had led to the narrowing and shallowing of the channel. The Yuantuojiao Point is located at the intersecting point connecting the North Branch of the Changjiang River and the Jiangsu coastline. Erosion cliffs are developed between the typical silty-muddy tidal flat and the salt marsh occupied by Spartina alterniflorea, and this has changed rapidly over the past few years. The sediment grain size analysis results of the surficial and two core samples indicate that the Yuantuojiao Point tidal flat experienced continuous accretional processes. Based upon 137Cs analysis results of the YT and YY Cores sampled from the tidal flat at the Yuantuojiao Point, the average sedimentation rate of the YT Core was 2.30 cm/a from 1963 to 2007, and 2.38 cm/a from 1954 to 2007 for the YY Core. The sedimentation rates of both core locations have declined since the 1960s corresponding to the seaward reclamation at the Yuantuojiao Point. The average sedimentation rates at the Yuantuojiao Point were similar to that of the silty-muddy tidal flat at the northern Jiangsu coast, but lower than that of the south of the Changjiang River Estuary. According to field morphological investigations from 2006 to 2008 on the salt marsh at the Yuantuojiao Point, cliffs retreated markedly by storm surges and disappeared gradually because of the rapid sedimentation on the silty-muddy tidal flat. The maximum annual retreat reached 10 m. The recent sedimentation and morphological changes of the Yuantuojiao Point tidal flat not only displayed the retreat of the salt marsh and the disappearance of cliffs, but also was accompanied by rapid sedimentation of the silty-muddy tidal flat and the salt marsh, indicating the responses to the tidal currents, storm surges, Spartina alterniflorea trapping sediments and large-scale reclamation. The sediment grain size and their trends, southward coastal flow, and sandspits of the longshore bars suggest that the main sediment source at the Yuantuoijao Point, estuary of the North Branch was possibly from the Changjiang River before 1958, since then, it has been from the south of the submarine radial sand ridges of the southern Huanghai Sea (Yellow Sea).

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Authors and Affiliations

  1. School of Geographic and Oceanographic Sciences, Key Laboratory of Coast and Island Development of MOE, Nanjing University, Nanjing, 210093, China

    Li Xie, Zhenke Zhang, Yunfeng Zhang, Yaping Wang & Xianjin Huang

  2. School of Resources and Environment of Guangdong University of Business Studies, Guangzhou, 510320, China

    Li Xie

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  1. Li Xie
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  2. Zhenke Zhang
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  3. Yunfeng Zhang
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Correspondence to Zhenke Zhang.

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Foundation item: The National Natural Science Foundation of China under contract Nos 41071006 and 40676052; the Jiangsu Natural Science Foundation under contract No. BK2010050; the Research Fund for the Doctoral Program of Higher Education of China under contract No. 20100091110011.

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Xie, L., Zhang, Z., Zhang, Y. et al. Sedimentation and morphological changes at Yuantuojiao Point, estuary of the North Branch, Changjiang River. Acta Oceanol. Sin. 32, 24–34 (2013). https://doi.org/10.1007/s13131-013-0274-8

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