Study On Optimal Dispatching Model Of Deep Tunnel Combined Shallow Drainage Network In D Region Of Guangzhou

Guangzhou has a very high population density and urban construction density,which has brought serious waterlogging problems and overflow pollution problems in some confluent areas.The drainage system of D region drainage basin in Guangzhou is a combined drainage system,and the design standard of drainage network is low,the transformation is difficult,and the overflow pollution is serious.Therefore,Guangzhou has launched the "D region test section of drainage system of deep tunnel in Guangzhou".Deep tunnel is a large drainage tunnel buried in underground space.On the basis of retaining and giving full play to the existing pipeline drainage system anD region inrush system,it is an important way and effective means to control initial rainwater pollution,reduce overflow pollution and alleviate waterlogging.Deep tunnel drainage system should be better integrated into the existing drainage system to form a more optimized drainage system with more complete structure and stronger connection.How to combine the deep tunnel drainage system with the existing shallow drainage network and optimize it has become an important problem to be solved.Using Info Works ICM software,based on the drainage network and topographic data of D region basin,the hydraulic model of D region basin drainage system is established.Firstly,the selection and layout of rainfall and liquid level monitoring equipment in drainage network are carried out,and the data online monitoring system is established.Secondly,the collected monitoring data are pretreated and analyzed by Eviews software,and the precipitation and liquid level data of A,B and C are selected for verification and validation of hydraulic model.The average relative error is 4.4%,and the error meets the requirements.Finally,the validated hydraulic model of the drainage system in the D-Chung basin is applied to the optimal dispatching strategy of the combined shallow drainage network of deep tunnels.According to the decentralized control theory of large-scale system,the large-scale drainage system of D-gush basin is divided into nine subsystems for decentralized control.Info Works ICM hydraulic model simulation analysis method is applied to determine the optimal dispatching rules of each subsystem of the joint optimal dispatching strategy model.Finally,a complete strategy model is obtained and compared with the original strategy.The comparison indexes of simulation results mainly include the inflow water,overflow water and total waterlogging water in deep tunnels.The results show that compared with the original scheduling strategy,the average reduction rate of the total amount of waterlogging is 1.1%,the average reduction rate of the waterlogging area is 1.9%,the reduction rate of the inflow water of the deep tunnel is 3.5%,and the reduction rate of the overflow water is 21.3%.On the basis of satisfying the design of waterlogging prevention and control,the joint optimal dispatching strategy can significantly reduce the overflow water and improve the use efficiency of deep tunnels to a certain extent.It has high rationality and reliability that it fits well with the purpose of building deep tunnels,the requirements of using them and better plays the role of existing drainage systems.The joint optimal dispatching strategy is significantly better than the original dispatching strategy.