Partition Of DMAs In Water Distribution Systems Based On Coupling Of Hydraulic And Water Age Information

As the important infrastructure for urban development and construction,the water supply pipe network system of the town is constantly developing and expanding as the scale of the town continues to increase and the number of water users continues to increase.This gives the operation of the pipe network.Management brings many tests,such as whether the pipe network is properly arranged,and the control of the pipe network is leaked.In order to improve the operation and management level of the water supply network,the UK first proposed the management mode of the District Metered Areas(DMAs).The DMAs of the water supply network system is a relatively complicated task,and there are many problems and factors to be considered,such as node water pressure,water quality requirements,and fire protection check and design check of the pipe network.If the partition is improper,it will have some adverse effects,such as reduced reliability and deterioration of water quality.Therefore,in order to make the hydraulic performance and water quality performance of the water supply pipe network after the DMAs is not deteriorated,this paper proposes a DMA zoning method based on the coupling of hydraulic and water age information,and through the case network.The research proves that the method can complete the pipe network partitioning,and can effectively control the leakage of the pipe network.This paper first summarizes the relevant research on DMA partitioning of the water supply network at home and abroad,including the basic concept of DMA partition,the basic steps of partition design,partition principle and precautions.In addition,this paper also systematically summarizes the management method of DMAs,mainly for traffic detection in each area,combined with the total score difference to analyze and determine the amount of water other than the actual leakage,in order to check the location of the pipe burst Or use the minimum night flow method to determine the leakage level of each area and clarify the direction of leakage control of the pipe network.Then,this paper introduces the proposed method of the DMAs,which is mainly divided into two steps: the division of the boundaries of the DMAs,and the arran gement of valves and water meters on the boundary pipe segments.The partitioning for the boundaries of the DMAs is mainly solved by using the spectral clustering algorithm based on the natural neighbors of nodes.Compared with the traditional spectral clustering algorithm,the spectral clustering algorithm based on natural neighbors of nodes introduces the natural neighbors of nodes(the connection relationship between pipe network nodes),so that the nodes are more compact after clustering and reduce the partitioning caused by the nodes.The total number of boundary pipe segments.After determining the boundaries of DMAs,the next step is installing a valve or water meter on the pipe segments on the boundary to isolate the individual DMA partitions.This s tep utilizes a multi-objective optimization algorithm for optimal solution.In order to ensure the normal operation and system performance after DMAs of the pipe network,this paper considers the optimization of the pipe network performance from two aspec ts:(1)optimizing the pressure balance of the pipe network;(2)optimizing the node water age of the pipe network.Therefore,this paper takes the sum of the pressure standard deviation of each DMA partition of the pipe network and the average water age o f the node as the optimization target,constructs the valve water table layout point optimization model of the DMA partition boundary,and solves the model by NSGA-II algorithm.Finally,this paper uses the two case networks of Modena pipe network and Colorado Springs pipe network to verify the proposed method about the DMAs.In the case of application case network,in order to compare the performance of the pipe network before and after the DMAs,this paper sets several sub-area evaluation indicators: node average pressure,pressure standard deviation,average water age,pipe network leakage and pipe network check.Applying the proposed method to sim ulate the case network,the results show that the method can effectively complete DMA partitioning under the condition that the water age of the pipe network is not increased(indirectly guarantee water quality),and The pressure distribution of the net is more balanced,which is beneficial to the water supply stability of the pipe network system.Compared with other DMA partitioning methods,it has certain advantages in engineering cost and guaranteeing the performance of pipeline network.Therefore,the method proposed in this paper has certain reference significance for water related enterprises in the DMA management of the pipe network.