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长江口粘粒泥沙(d<0.01mm)主要由粘土矿物组成,由于各种粘土矿物能反映自然地带的差异,用X射线衍射分析,求出长江口及其补给区的粘土矿物百分数后,能用岩矿分析法计算粘粒泥沙的来源与数量。计算表明有96.5％的粘粒泥沙来自长江补给区,据大通站多年平均的粘粒泥沙年输沙量,推算出长江口粘粒泥沙量为0.9579亿吨/年。经1915年和1963年的长江口实测地形图比较验证,两者相差10.2％。本研究法对于河口无泥沙
The clay sediment (d <0.01mm) in the Changjiang Estuary is mainly composed of clay minerals. Since various clay minerals can reflect the differences in natural zones, the percentage of clay minerals in the Yangtze Estuary and its recharge area can be calculated by X-ray diffraction analysis. Rock and Mineral Analysis can be used to calculate the source and amount of clay sediment. Calculations show that 96.5% of the clay sediment comes from the Yangtze River recharge area. According to the average annual sediment discharge of clay and sediment in Datong Station, it is estimated that the amount of clay sediment in the Yangtze Estuary is 959.9 million tons / year. The 1925 and 1963 Yangtze River Estuary topographic maps compared to verify, a difference of 10.2%. This research method for the Estuary no sediment