长江口徐六泾流量与大通流量间关系的探讨

Discharge Relationships between Xuliujing of Yangtze River Estuary and Datong

为掌握长江的实际入海流量，基于长江大通水文站和长江口徐六泾水文站2008年全年流量资料，初步分析探讨了徐六泾流量和大通流量的关系。结果表明．徐六泾日流量和大通日流量过程基本一致，但徐六泾日流量过程较大通滞后4～6d；徐六泾与大通日流量差值存在14．8、28．4、166．6d的变化周期，分别对应天文潮的半月周期、月周期和春秋大潮周期的变化；从全年看，徐六泾流量略大于大通流量；大通流量基本可代表长江的入海流量。

Based on the discharge data of Datong （DT） in the Changiiang（CJ） and Xuliujing（XLJ） in the Changjiang Estuary（CE） of 2008, the discharge relationship between XLJ and DT is studied. The results show that the process of daily discharge of XLJ is almost consistent with that of DT; but there is a time delay of 4 to 6 days between the process of daily discharge of XLJ and DT; there are 14.8 days, 28.4 days and 166.6 days period components of the difference between daily discharge of XLJ and DT, which correspond to half-month, monthly and spring-to-autumn cycle of tide respectively; the discharge of XLJ is a little greater than that of DT from the view of the whole year; so the discharge of DT can be used to represent the discharge of CJ into the sea.