将感潮河段退水曲线视作上游洪水波退水与下游潮水波顶托两种独立过程双向运动的叠加，根据洪水波退水公式和调和分析方程建立感潮河段双向波退水曲线耦合模型。以姚江入江口段姚江大闸次洪退水过程为研究对象，对2008~2016年15场次洪水退水段进行了模拟。结果表明：各次洪退水段模拟的洪水波参数取值较稳定，说明退水规律较好；潮水波比重系数的大小与河道水位、降水以及天文大潮的出现有关；双向波退水曲线耦合模型能够较好地模拟姚江流域出口的退水过程。

It is assumed that flood and tidal waves in a tidal reach are independent of one another，recession stages can be considered as the superposition of bi -directional propagation． Based on the assumption，a bi -directional recession curve coupling model for tidal reach is developed according to the flood wave recession formula and harmonic analysis equation． Taking the Yaojiang Ｒiver＇s large sluice in Yaojiang Ｒiver estuary as an example，this paper simulates a recession period of 15 floods in 2008－ 2016． The results show that the flood wave＇s parameters of every flood are stable and that the law of recession is better． The coefficient of the proportion of the tidal wave is related to the water level，precipitation and highest astronomical tide． The bi-directional recession curve coupling model can better simulate the recession process of Yaojiang Ｒiver drainage basin．