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在流域汇流研究中,纳什(J.E.Nash)瞬时单位线模型存在两个问题:(一)将整个流域的净雨置于流域上游顶端不甚合理。(二)纳什模型建立在“迅发”理论的基础上,仅仅考虑调蓄场的作用,而忽视了水体的推移,这与洪水波在河道里传播的实际情况是不相符的,即使在水库库区,也仍然存在着传播时间,只不过在水库调洪演算时,由于传播场的作用较之调蓄场的作用为小,从而忽略了传播场的作用。这里,我们提出下面的改进。
In the study of watershed convergence, the J.E.Nash instantaneous unit-line model has two problems: (i) It is not reasonable to place the net rain over the whole basin at the top of the upper reaches of the basin. (2) Based on the theory of “rapid onset”, the Nash model only considers the role of the storage field and neglects the transition of the water body. This is inconsistent with the fact that the flood wave propagates in the river. Even in the reservoir In the reservoir area, the propagation time still exists. However, in the process of reservoir flood regulation, the role of propagation field is neglected because the role of propagation field is smaller than that of the storage field. Here, we propose the following improvements.