Study On Emergency Water Delivery Scheduling Of Beijing-Shijiazhuang Section Of The Middle Route Of South-to-north Water Transfer Project

The Middle Route Project of South-to-North Water Transfer has the characteristics of long water transmission line,no online storage and storage reservoir,limited storage capacity of the tank,and serious hydraulic lag.Under the accident conditions,if the regulation is improper,the water level will rise rapidly,and in extreme cases there will be a levee,which may lead to the risk of damaging the channel lining.Since the commissioning of Huinanzhuang Pumping Station,there have been many abnormal shutdowns of pumping stations,resulting in a rapid rise in the water level in the downstream section of the Beijing-Shijiazhuang section,which has caused great pressure on the operation and dispatching staff.The downstream channel section size of the mid-line project is small,and the channel's capacity for storage is limited.The capacity of the upstream channel of the North Juma River gate is particularly limited.The early warning water level of the channel to the design water level and the increased water level are only 0.2m and 0.1m.In the case of unexpected events such as abnormal shutdown of the Huinanzhuang Pumping Station,improper control can easily cause channel lining damage.Therefore,the development of the Beijing-Shijiazhuang emergency dispatching program and the simulation of different emergency strategies,the water level fluctuation characteristics of each channel along the line,can not only provide a scientific basis for optimizing emergency plans and formulating emergency dispatch strategies,but also enhance the perceptual understanding of the operational dispatchers,and provide technical support for the establishment of the dispatcher's emergency dispatch plan library and the rapid and scientific response to emergencies.Based on C#language and Visual Studio2017 platform,this paper develops an object-oriented emergency dispatching system based on object-oriented Beijing-Shijiazhuang section,and briefly analyzes the hydraulic characteristics of the Beijing-Shijiazhuang section under sudden events such as abnormal shutdown of Huinanzhuang pumping station.The development platform can be used as a training platform for the operation dispatcher to enhance the understanding of the operation and dispatch personnel on the characteristics of the water flow movement of the mid-line project,and lay a foundation for the operation dispatcher to quickly formulate an emergency dispatch plan.The research shows that:1)The dimensionless flow passing formula can simplify the flow rate setting process and improve the calculation accuracy of the flow;2)When the water flow of Huinanzhuang Pumping Station is 45m~3/s,the bypass valve is fully open after 20minutes of abnormal shutdown.When the pumping station is restarted,the water level in the upstream channel of the North Juma River does not exceed the warning water level.At this time,it is not necessary to start the North Juma River backwater gate;3)During the abnormal shutdown of the Huinanzhuang pumping station,the upstream control gate can be controlled.The opening achieves the goal of less discarding or even abandoning water.For the first time,this paper develops a human-machine interaction-friendly emergency dispatch calculation and analysis system for the emergency events caused by the abnormal shutdown of the Huinanzhuang Pumping Station in the Beijing section of the Middle Route of the South-to-North Water Transfer Project or the sudden shutdown of the throttle along the line.It revealsthe channel hydraulic characteristicsof long-distance water channel under the sudden closing of the gate,and has certain significance for improving the emergency response capability of the Middle Route of the South-to-North Water Transfer Project and enriching the emergency dispatching theory and technical achievements of the long-distance water transfer project.