Study On Emergency Regulation Of Typical Emergencies Of Tandem Channel Pool In Water Transfer Project

China’s total water resources are abundant,but there is also a spatial imbalance of water resources Nando North,East and West.The construction of water transfer projects is an effective way to solve the spatial imbalance of water resources and achieve optimal allocation of water resources.Water transfer project is large in scale,long in route and many control components,facing the risk of numerous emergencies,which will endanger the safety of the water transfer project,so it is especially important to carry out emergency control work to reduce the harm and impact of the emergencies in the event of water transfer project emergencies.This paper takes two typical emergencies,namely,the sudden water pollution event of the South-North Water Transfer Project and the sudden failure of the pumping station of the Jiaodong Water Transfer Project,as examples,based on a one-dimensional hydrodynamic model,to study the emergency control scheme of the tandem canal pool of the water transfer project under the emergencies,to ensure the engineering safety,water quality safety and water supply safety of the water transfer project,and the main research results and conclusions are as follows:(1)In order to realize the accurate simulation of water transfer process in the tandem canal pool of water transfer project,the basic principle of one-dimensional hydrodynamics is analyzed,and the one-dimensional hydrodynamic model of the middle line of South-North Water Transfer Project from Diaohe River Lock to North Rejecting Horse Lock and the Jiaodong Water Transfer Project from Songzhuang Diversion Lock to Huangshui River Pumping Station is constructed by combining the basic topography and building information of the project.The results show that the simulation results of water level and flow of the constructed 1D hydrodynamic model are consistent with the trend of the measured data,and the average absolute error of the simulation results of the water depth before and after the gate is controlled within 0.1m,and the relative error is controlled within 5%.The relative error is below 5%.(2)In order to cope with the tandem gate group of sudden water pollution events,to minimize the impact caused by it,for different areas of the emergency control of the objectives and characteristics of the proposed water transfer project tandem canal pool of sub-regional emergency control ideas,study the corresponding emergency control program.The section of the canal where the sudden water pollution occurs is the accident area,from the beginning of the study area to the first throttle gate of the canal section of the accident area,and the upstream section of the accident area,from the end throttle gate of the canal section of the accident area to the end throttle gate of the study area.For the accidental canal pool,a regulation scheme based on the precise receding method is proposed,which can reduce the receding water by 37.9%compared with the conventional receding method.For the upstream section of the accident basin,in order to ensure the safety of the project,a regulation scheme based on the method of reducing the incoming water is proposed.It is calculated that when the emergency regulation time of the accident section is 19099 s,the incoming water from upstream needs to be reduced to10.39m3/s in order to ensure the water level is below the maximum level.For the downstream section of the accident zone,the water supply method based on optimized zoning is proposed to ensure the safety of water supply,and the continuous water supply time is calculated for different water supply scenarios.The calculation results show that the continuous water supply time of the key gate is extended by up to 29 times using the optimized zoning method.(3)In order to cope with the sudden failure of pumping stations and to ensure the safety of the project,the emergency response time of the drainage section was calculated for the four drainage sections from Songzhuang Diversion Gate to Ashibu Pumping Station,Ashibu Pumping Station to Dongsong Pumping Station,Dongsong Pumping Station to Xinzhuang Pumping Station and Xinzhuang Pumping Station to Huangshui River Pumping Station,when the four pumping stations of Ashibu,Dongsong,Xinzhuang and Huangshui River failed,with different upstream and downstream flow rates and pumping station stopping flow rates under different working conditions.The shortest emergency response time for each section was64 min,130min,57 min and 76 min in front of the pumping station in the downstream of the section,and the emergency control model was established to reduce the abandoned water,and the gate control opening scheme was calculated for the gate along the upstream of the section where the failed pumping station is located.