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根据长江口及其补给区的大量泥沙的重矿物鉴定表明,沙样中重矿含量百分数较为稳定,故能用矿物分析法计算出长江口泥沙(d>0.01毫米)的来源与数量.计算表明有96.1％来自长江补给区.据长江大通站多年平均的年输沙量推算,长江口的泥沙量为3.590亿吨/年.经1915年和1963年的长江口实测地形图比较量算的验证,两者相差2.7％.本研究法对于河口无泥沙测验与地形测量资料的情况下,研究泥沙来源与数量具有理论与实际的意义.
According to the heavy minerals appraisal of a large amount of sediment in the Changjiang Estuary and its recharge areas, the heavy mineral content in sand samples is relatively stable, so the source and quantity of sediment (d> 0.01 mm) in the Yangtze Estuary can be calculated by the method of mineral analysis. Calculation shows that 96.1% came from Yangtze River recharge area. According to the annual average sediment transport of Datong Railway Station in Changjiang River, the sediment amount of Yangtze River Estuary is 359 million tons / year. Compared with the measured topographic maps of Yangtze River Estuary in 1915 and 1963 Calculation, the difference between the two is 2.7% .This research method is of theoretical and practical significance for the study of sediment source and quantity in the case of estuary sediment test and topographic survey data.