鄂北调水工程中的孟楼七方倒虹吸长达72km，其闸门调控下的出口边界设置对倒虹吸管内水力响应过程有显著影响。超长倒虹吸出口闸门处于有压段与明渠段的交界处，属于长有压管道闸孔淹没出流，具有高度耦合、非线性化的特点。常用的有压隧洞泄流公式未考虑倒虹吸内的非恒定流运动，不适于作为长倒虹吸出口边界，Henry公式能够合理反映闸门调控下的水力响应规律，但难以反映水击震荡特性。在此基础上，提出一种将出口闸门涵管化的边界处理方法，仿真结果揭示出在快速关闸时倒虹吸管中伴随有显著水击振荡，下游段事故工况中最大水击压强达25.1m（初始压强为8.8m），最大水击振幅为16m，压强变化特性与类似试验结果相符。提出的方法可为鄂北调水工程的事故工况调度提供技术支撑，也可为类似明满流动态边界仿真建模提供参考。

The Menglour Qifang inverted siphon is 72 km long in the north Hubei water diversion project.. The setting of the out let boundary under the control of its gate has a significant impact on the hydraulic response process in the pipe. The super-long inverted siphon out let gate is located at the junct ion of the pressure section and the open channel set ion. It belongs to the orifice submerged outflow of the long pressure pipeline and has the characteristics of high coupling and nonlinearity. The commonly used pressure tunnel discharge formula does not consider the unsteady flow in the inverted siphon and is not suitable as the out let boundary of the long inverted siphon.The Henry formula can reasonably reflect the hydraulic response law under the gate control, but it is difficult to reflect the vibration characteristics of water hammer. On this basis,a boundary treatment method for ulverting the exit gate was proposed, the simulation results revealed that there was significant water hammer during rapid closing in the inverted siphon, the maximum water hammer pressure in the downstream accident conditions was 25.1m(the initialpressure was 8.8m), the maximum water hammer amplitude is 16 m, and the average pressure variation characteristics are consistent with similar experimental results.The proposed method can provide technical support for the int ervention schedule in the water transfer project in northern Hubei and is also a reference for similarly dynamic boundary simulation modeling in the free surf ace pressurized flow.

国家自然科学基金（51979202；51439006；51009108）；国家重点研发计划项目（2016YFC0401810）