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Sedimentation and morphological changes at yuantuojiao point, estuary of the North Branch, Changjiang River

Acta Oceanologica Sinica 2013年第2期32卷 24-34页

作者： XIE Li ZHANG Zhenke ZHANG Yunfeng WANG Yaping HUANG Xianjin School of Geographic and Oceanographic Sciences Key Laboratory of Coast and Island Development of MOENanjing University School of Resources and Environment of Guangdong University of Business Studies

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 runoffto 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 indi- cate that the Yuantuoiiao point tidal fiat 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 sed- imentation 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 Yuantnojiao point were similar to that of the silty-muddy tidal flat at the northern ]iangsu 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 gradu- ally 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, south

关键词： sedimentation rate morphological changes the tidal fiat salt marsh cliff seaward reclamation yuantuojiao point the North Branch of the Changjiang River

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