Study On Real-Time Dispatching Mode Of Open Channel Water Transfer Project

The establishment of water transfer project is an effective means to alleviate the shortage of water resources and optimize the allocation of water resources.In the open channel water transfer project,in order to ensure the safety of the operation and dispatching of the water transmission channel,provide scientific dispatching decision and assist the dispatching personnel to carry out scientific dispatching,Therefore,in the open channel water transfer project,the accurate real-time water situation perception,the water level control under the flow switching state of the pumping station and the emergency dispatching to ensure the safety of water supply downstream of the accident section in the face of sudden water pollution events are all problems that need to be solved.In order to explore the real-time dispatching mode of open channel water transfer project and develop the key technologies of real-time decision-making,this thesis takes the middle route of South-to-North Water transfer project and Jiangjiang-Jihuai project as examples to establish the hydrodynamic simulation parameter inversion model,the rapid prediction model of water level change and the emergency control model.The main research results and conclusions of this thesis are as follows:(1)Establish a hydrodynamic model for unsteady flow,within the boundary of coupling gate,comparing with the simulated values and measured values,adopting dimensionless analysis method,the principle of the realization of the flow coefficient of different gate fitting,cited Jiang Jihuai engineering west one million megabytes of river gate as an example,the dynamic model of combined water right brake flow coefficient inversion,The average error of flow simulation after inversion is 4.32m3/s,and the percentage of error is less than 5%,indicating that the simulation accuracy is high.The hydrodynamic unsteady flow model was established,and the particle swarm optimization(PSO)algorithm was used to invert the roughness in real time.The optimum roughness value of the channel pool was calculated by iteration of different particles.Taking the Zhaohe River line in Huaixi River as an example,the channel roughness inversion shows that the optimal roughness of the Xihe River reach is 0.045,which increases the simulation accuracy by 11% compared with the original roughness of 0.015,the simulated Nash coefficient reaches 95%,and the maximum error of the simulated water level compared with the measured value is only 0.12 m.Compared with the measured water level,the maximum error of the original roughness simulation is 0.28 m.It shows that the inversion model can improve the sensing ability of real-time water condition.(2)The model predictive control coupled with hydraulic response is established,and the optimization algorithm in the original model predictive control is replaced by the hydraulic response process of the canal pool,which greatly reduces the difficulty of the implementation of the model predictive control algorithm.The model was applied to the Jiangjiang-Jianghuai communication section,and the hydrodynamic model was used as the simulation model of the channel.The results show that compared with the simulation model,the maximum error of the control time generated by the improved model predictive control is 0.76 h,the minimum error is only 0.03 h,and the simulated Nash coefficient is as high as 98%.In order to test whether the project can not reach the limit water level by implementing the control scheme output by MPC model,the control time is substituted into the hydrodynamic simulation model.The results show that the highest water level simulated by the simulation model is lower than the highest operating water level of Paihekou pump station at 5.8m.(3)Establish the downstream emergency control model of open channel sudden water pollution accident section.A rapid quantification method of pollutants was proposed to simulate the diffusion process of pollution clusters.Aiming AT THE DOWNSTREAM OF THE SUDDEN WATER pollution ACCIDENT SECTION,THE METHOD OF optimizing ZONING IS PUT FORWARD,according to the different water distribution flow of the downstream channel pool,the adverse channel pool is divided,and the downstream control gate of the adverse channel pool is closed,so as to prolong the whole downstream water supply time of the accident section.In middle route of southto-north water transfer project Xiao river as the study area of gate-Gang Tou tunnel gate,Xiao river sluice gate-sudden water pollution incident of the ancient canal gate,through the pollutants quantitative method,identify the accident section for Xiao-of hutuo river gate of river gate,accident section downstream of hutuo river gate-Gang Tou tunnel gate.The duration of emergency in the accident section was 7.9h;Downstream of the accident section,two unfavorable canal pools were identified by optimizing the zoning method,and the water supply time of unfavorable canal pools was extended by 6.13 and 5.61 days.