南水北调中线线路长,沿线分水口门多,且无在线调蓄水库,输水调度技术难度大。输水调度通过调整总干渠沿线各节制闸过闸流量,以满足分水口门的供水需求。目前中线过闸流量计算采用传统水力学经验公式,需根据实测水情数据,定期人工修正公式中参数,灵活性差。本文通过南水北调中线输水调度实践,建立了基于遗传程序结合水力学方法的过闸流量模型,根据实测流量计算流量系数,并利用遗传程序自动拟合节制闸的闸前水位、闸后水位、闸门开度与流量系数的非线性关系,进而实现过闸流量计算。经在南水北调中线节制闸的试用表明,该模型具有很强的自适应能力,灵活性强,拟合精度较高,而且较好地避免了直接拟合流量时泛化能力较弱的不足,具有较强的实际应用和推广价值。 South-to-North Water Diversion Middle Route Line, many diversion points along the route, and no on-line regulation of reservoirs, water dispatching technology is difficult. Water dispatch By adjusting the sluice gate traffic flow along the main canal to meet the water demand of the diversion gate. At present, the calculation of the flow through the median line is based on the traditional hydraulics experience formula, and the parameters in the formula should be manually and regularly corrected according to the measured hydrological data, which results in poor flexibility. Based on the practice of water diversion scheduling in the mid-route of South-to-North Water Diversion Project, a model of overrun flow rate based on genetic program combined with hydraulics was established. The flow coefficient was calculated according to the measured flow rate and the genetic algorithm was used to automatically fit the water level before gate, Opening and flow coefficient of non-linear relationship, and then to achieve gate flow calculation. The trial of the mid-route control gate of South-to-North Water Diversion Project shows that this model has strong self-adaptability, strong flexibility and high fitting accuracy, and better avoids the weak generalization ability when directly fitting the flow, Strong practical application and promotion value.