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在Ｓｔｒａｈｌｅｒ河流分级法的基础上，提出了单元级别的确定原则，并进一步定义了概念性流域地貌汇流模型．为了将河道洪水演算方法移置到流域汇流模型中，还定义了“滞时演进河段”这一新的概念性元素．推导了三级流域瞬时单位线，选用内罚函数法估计模型参数，实例检验，模型拟合精度较高．
On the basis of Strahler river classification method, the principle of unit level determination is proposed and the concept of conceptual basin flow confluence model is further defined. In order to relocate the calculation method of river flood into the basin confluence model, a new conceptual element of “Hysteresis Lag” was also defined. The transient unit line of the Three-level River Drainage Basin was deduced. The internal penalty function method was used to estimate the model parameters. The example test showed that the model fitting accuracy was high.