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In 2000 and 2003, five-hundred and twenty (520) riverbed sediment samples were taken from the middle-lower Yangtze trunk channel to examine the river hydromorphological nature. Analytical result shows that the riverbeds mostly consist of mostly medium to coarse sands, but silty fine sand near the river coast. The result further indicates 12 zones (I–XII), identified as alternated coarse- fine-grained...