针对平原河网地区汇流模拟困难且成果难以校验的特点,提出一种与平原河网非恒定流计算模型相耦合的汇流模型。模型提出概化单元的概念,并通过水量平衡方程和水动力方程加以数学表达。实例验证结果表明,该模型能有效模拟田间径流与骨干河网相互影响的实际情况。 Aimed at the difficulty of confluence simulation in the plain river network and the hard-to-verify results, a confluence model coupled with the unsteady flow calculation model of the plain river network was proposed. The model proposes the concept of a generalized unit and is mathematically expressed by the water balance equation and the hydrodynamic equation. Experimental results show that the model can effectively simulate the actual situation of interaction between the field runoff and the backbone river network.