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为研究南水北调中线输水渠道中分水口流量变化对干渠的影响特征,选取天津分水口为例,采用一维Saint-Venant数学模型模拟计算该分水口各种分水状态下干渠中的水流过渡过程。采用虚拟渠道等效糙率法来模拟渠道中各类型的输水建筑物的影响。得出该分水口关闭时间超过33.6 h会导致紧邻下游端的西黑山节制闸前水位出现漫顶,分水口前水位下降速度与分水口流量变率呈线性变化关系,并给出了其拟合公式。
In order to study the influence of the change of diversion outlet flow in the midline of South-to-North Water Diversion Project (Diversion Channel) on the main canal, a one-dimensional Saint-Venant mathematical model was used to simulate the transition of water flow in the diversion channel . The virtual channel equivalent roughness method is used to simulate the influence of various types of water conveyance structures in the channel. It is concluded that the closing time of the catchment exceeding 33.6 h will cause the water level of the West Black Mountain near the downstream end to overflow suddenly. The rate of water drop before the catchment changes linearly with the flow rate of the diversion outlet. The fitting formula .