Joint Regulation And Control Of Water Quantity Combined With Quality For Water Transfer Project In Water-receiving Area

Inter-basin water transfer project is an effective mean to solve the problem of water shortage in water-receiving area.However,the application of water transfer project will change the original water allocation pattern for the existing river,channel,lake,and reservoir in the main channel and receiving area which form a complex water transfer network and owe some regulation and storage capacity.In addition,the transferring water is combined with the local water supply,and real-time water allocation is conducted through the diversions along the water transferring line to multiple water users.The water quality of transferring water in different periods is different,and the water quality of each water outlet changes at any time.Therefore,the water-receiving area is not only complicated in the water diversion network,but also has the characteristics of multiple water resources,multiple users,and unequal spatial and temporal distribution of water quality.The problem of water resources allocation is more complicated.According to the complex water network of river,channel,lake and reservoir,water quantity and quality joint regulation study has been conducted in order to achieve a reasonable allocation in time,space,quantity,quality and use of water source including transferring water and various local water.In the past,the studies mostly made water simulation and water quality simulation in turn,ignoring the correlation and interaction between water quantity and water quality,failing to reflect the needs of real-time feedback and optimization.And the existing model based on numerical simulation has the problem of large computational load.This paper has realized joint regulation and control of water quantity combined with quality,and obtained the water resources allocation schemes at the complex water network of river,channel,lake and reservoir which makes full use of the regulation and storage capacity of engineering group.We mainly studied the joint regulation and control model of water quantity combined with quality.The model above combines the scheduling model with real-time water quality and water quality information,so it can achieve scientific water resources regulation via paying a lot attention to the interrelationship between water quantity and quality and improving the solving speed.The research content and main results are as follows:(1)For the complex water transfer network combined river,channel,lake,and reservoir,a water quantity optimal scheduling model has been established and solved subsequently.The water supply scheme of diversions and the water allocation of each water-receiving area considering only the amount of water have been obtained,which provides a reliable foundation for the water quantity and quality joint regulation study.Shandong section of the South-to-North Water Diversion Route Eastern with a complex water transfer network of river,channel,lake and reservoir was selected as an example.(2)Considering the requirements of water quality and quantity at the same time,a method for joint regulation and control of water quantity combined with quality applicable to the complex water transfer networks has been proposed.First,hydrodynamic and water quality model has been established to realize integrated calculation of water quality and quantity for complex water diversion networks and study the change of water quantity and quality of water-receiving area.Second,optimization scheduling model has been introduced according to the actual demand of water quantity and quality.The coupling of the simulation model and the optimization model is realized by interactive method,the joint regulation and control model of water quantity combined with quality is established.(3)In view of the characteristics of multi-source,multi-user and multi-objective in the water-receiving area,the joint regulation and control model of water quantity combined with quality will suffer from the problem of “dimensional disaster”.The model has been decomposed into two-level hierarchical one based on the dimension reduction in order to resolve the problem.The first level is an optimal regulation model among the water receiving units,which can deploy the various types of water resources among the water receiving units in different water-receiving area s.The second level is an optimal regulation model in the water receiving units which can distribute the allocated water quantity in each water-receiving area to different users.(4)The solution of the model involves three parts: simulation model,optimization model,and the coupling of simulation model and optimization model.The key to model resolution is the coupling of simulation model and optimization model,therefore,a coupling technology based on the surrogate model has been established.Using the surrogate model can solve the coupling process and the input and output response relationships can be as a part of the objective function during the solution procedure which finally shortens the calculation load and improves efficiency.(5)For the complex water transfer network combined river,channel,lake,and reservoir,Shandong section of the South-to-North Water Diversion Route Eastern was selected as an example.A mathematical model of hydrodynamic water quality has been established,basing which simulating and analyzing the changes in quantity,level and quality under different flows.The results show a full play of regulation and storage capacity of the project,which achieves safe water conveyance in complex water transfer network,completes integrated water quantity quality simulation calculations and the linkage changes of water quantity and quality.All of above provides basis for the formation of scheduling scheme in complex water network.(6)The joint regulation and control model of water quantity combined with quality has been applied to Shandong section of the South-to-North Water Diversion Route Eastern.Considering the water quality index of diversion and,the surrogate model of Kriging was established.The reasonable water allocation scheme was obtained according to the water conditions of water quantity and quality with time along water transferring line and diversions.The water supply scheme of diversions and the water allocation of each water-receiving area considering have been obtained,and it is clear what the allocation of various water resources are among the use of domestic,industrial,agricultural and ecological.