长江口悬浮体的粒度特征

The Grain - Size Characteristics of the Suspended Matters in the Changjiang Estuary

本文论述长江口悬浮体的粒度组成、分布及其影响的因素。长江口悬浮体的粒度较细,以细粉砂含量为最多。在平面分布上,北粗南细,面粗东细;在季节变化上,冬季较夏季粗;在潮周期中,落急粗,涨憩细。悬浮体的粒度组成受到其物质来源、河口表层沉积物的结构及水动力等条件所制约。

This paper intends to describe the composition , distribution of the suspended matters in the Changjiang Estuary ,and the effects on them ,The suspended matters in the Changjiang Estuary are fine in grain-size ,among them the volume of the fine silt is the Largest. In the plane distribution, the suspended matters are coarser in the north and finer in the south , and coarser in the west and finer in the east. The suspended matters have seasonal variations , coarser in the winter and finer in the summer. In one tidal period , they are coarser in the ebb strength and finer in the flood slack. The composition of the suspended matter in grain -size is affected by the material resources , the structures of the surface sediments in the estuary , and the hydro-dymamic conditions.