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近两千年来,长江河口河道束狭淤浅,南岸边滩伸展,河槽成形,河道加深,形成现代河口的形态。长江河口的沉积物分布是和河口地形及水下三角洲的发育密切相关的。本文研究了沉积特征以及它与沉积环境、地貌和水文特征之间的关系。大量材料分析表明,沉积物的粒度大小和水动力条件相适应,分选系数、偏态和中值粒径之间有相关性。长江河口可分为四个沉积区:河口段上段沉积区;河口分汊河段沉积区;河口拦门沙沉积区;水下三角洲沉积区。
In the recent two thousand years, the bunds of the Yangtze River Estuary have been narrow and shallow, the southern bank has been expanded, the river channel has been formed and the river has deepened, forming a modern estuary. The sediment distribution in the Yangtze River Estuary is closely related to the estuary topography and the underwater delta development. This paper investigates the sedimentary characteristics and its relationship to sedimentary environment, topography and hydrological characteristics. Massive material analysis shows that the size of the sediment is adapted to the hydrodynamic conditions, and there is a correlation between the sorting coefficient, the skewness and the median particle size. The Yangtze River Estuary can be divided into four sedimentary areas: the upper estuary sedimentary area; estuary Fen River sedimentary area; estuary barren sedimentary area; underwater delta sedimentary area.