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| Citation: | Lin Yifan, Dai Zhijun, Xie Hualiang, Wei Wen, Ge Zhenpeng, Gao Jinjuan. The research of exchange processes between the suspended sediment near the bottom and the depositions in the Changjiang (Yangtze) Estuary[J]. Haiyang Xuebao, 2014, 36(7): 99-110. doi: 10.3969/j.issn.0253-4193.2014.07.011
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The large estuarine sediment dynamic process has been the core content of the land ocean interactions in the coastal zone research. The vertical exchange for sediments in the different water depth of the estuary is a key in the analysis of estuarine dynamics and deposition mechanism. Here,a large-scale and dense sediment samples cruise of the Changjiang (Yangtze) Estuary was carried out in December 2011,where three sets with 303 sediment samples including suspended sediment near the bottom,surface deposition with a vertical thickness of 1 to 2 cm,and subsurface deposition with a vertical thickness of 2 to 10 cm were simultaneously taken by grabber instrument. Thereafter,based on the collected sediment samples,the empirical orthogonal function method was applied to discuss the exchange process of the suspended load near the bottom and bed sediments. The results are shown as follows: the spatial distribution patterns of the suspended load near the bottom of the Changjiang Estuary are mainly composed of silt with a small difference in spatial distributions. The spatial distribution patterns of surface bed sediments and subsurface bed sediments are similar with regional characteristics. Their spatial distributions are more complex than that of the suspended load near the bottom. In the central district of Nanhui Shoal,sediments were characterized by coarse silt and fine sand,and the sediments distributed in other areas were characterized by silt. Furthermore,the first mode of the sediments by EOF could mainly reflect the sediments movement of fine particle size,and the second mode mainly reflects the sediments movement of coarse particle size. The vertical exchange between the suspended load and the surface bed sediments with main grain size is silt components. However,during the exchange process between the surface bed sediments and subsurface bed sediments in the central district of Nanhui Shoal,the dominant exchange component is coarse silt,and fine sand exchange occurred in other regions. Taken altogether,grain size with silt components of the Changjiang Estuary should play a dominant role in bed sediments exchange process.
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