引黄济津应急调水工程河北段输水能力计算

针对引黄济津应急调水工程河北段的输水能力进行了研究。渠段的输水能力是指渠段所能通过的最大入流量，即渠段的首端断面所能通过的最大流量。根据引黄济津应急调水工程近4年的实测数据，构建了适于干河床水流推进过程渗漏损失的改进模型、小水深情况下的糙率加大模型，并采用均匀试验优选方法对水力参数进行了反演，利用非恒定流模型对引黄济津河北段渠系输水能力进行了计算。结果表明，建立的渗漏损失改进模型、小水深情况下的糙率加大模型是合理的，反演得到的参数是精确的；由于在水流推进与涨水阶段渠床的非稳定渗漏起了较大作用，所以各渠段的输水能力在非稳定输水阶段比稳定输水阶段稍大。输水能力的计算结果可以为引黄济津未来几年的输水规划与调度提供具体的指导。

Calculation of Canal Capacity for the Heibei Reach of Emergency Projectof Diversion Yellow River Water to Tianjin

Calculation of canal capacity for the Hebei reach of the Emergency Project of Diversion Yellow River water to Tianjin is presented. Canal capacity is the maximum flow rate that can be conveyed by a canal, that is, the capacity of the inlet. A flow advancement model is developed firstly; seepage losses when the flow advancing on a dry riverbed and roughness increase under shallow water depth conditions are considered in this model. The model parameters are estimated using the uniform experiment optimization approach and four-year observation data, and then it is used to calculate the canal capacity of the Heibei reach of Emergency Project of diversion Yellow River water to Tianjin. The results show that the modified seepage loss and roughness models are reasonable and the parameter estimates are acceptable; the canal capacity during unsteady stage is larger than that during steady stage due to significant seepage losses during flow advancement and freshet. The results can provide scientific guide to project planning and operation.