长江下游感潮河段造床流量计算研究

摘要

Tidal flow mathematical model is used to calculate the dominant discharge and to investigate characteristics and changing rules of the tidal reach from Datong to the Yangtze River estuary.The results show that the flow sediment transport rate method is convenient and the calculation result is reasonable when applied to the tidal reach.There are two dominant discharges for the reach above Tianshenggang,while there is a flow group for the lower reach of Xulujing.The dominant discharge changes little along the way from Datong to Yizheng,and then gradually increases along the way from Yizheng.It should be mainly related to the increase of the tidal prism along the way.%针对长江下游大通至长江口的感潮河段,借助潮流数学模型,计算造床流量,研究其特点及变化规律.研究表明:计算感潮河段造床流量时,流量输沙率法使用方便,计算结果较为合理;对于天生港以上河段,存在两个造床流量,而对于徐六泾以下河段,则存在一个造床流量群;大通至仪征河段的造床流量沿程变化较少,自仪征开始造床流量沿程逐渐提高,主要应与纳潮量沿程增加有关.