长江输沙与河口的冲淤变化关系

以长江宜昌站、汉口站和大通站的径流量、输沙量等水沙特征值以及在崇明东滩上的实测数据为资料来源，探讨了多年来长江口的来水来沙态势，并运用泥沙通量估算方法，推算出近年崇明东滩的年淤涨速度，通过对比发现：近年来长江的径流量未见减少，输沙量却有减少的趋势；潮滩向海淤涨明显减慢．作者对两者之间存在的关系及其原因作了初步探讨，认为潮滩淤涨减慢在很大程度上是由于长江的输沙量减少所致；淤涨减慢的幅度超过了来沙量减少的程度，其重要原因是上游来沙减少的主要是易于沉积的中粗颗粒部分．

Research on the relationship between sediment transportation of the Yangtze River and erosion-deposition variation of the Yangtze Estuary

Erosion-deposition variation of the estuary should have some correlation with sediment trasportation of the river, and the expansion of the tidal flat in the Yangtze Estuary provides us with a case study. Based on the hydrological data from the main hydrological stations-Yichang Station, Hankou Station and Datong Station in the middle reach of the river, and the field measurements in Chongming East Tidal Flat in the estuary, this paper has study how the variation of the sediment transportation of the Yangtze River affects the erosion-deposition of the Yangtze Estuary. The study results show: over the last few years, the sediment load had an obvious tendency of reduction, although the discharge of the river did not decrease; the sediment deposition in the tidal flat became less in the last few years; the decrease of the sediment deposition mainly results from the reduction of the coarse grains in the Yangtze Estuary.