Study On Optimal Layout Of Pressure Monitoring Points And Multi-Conditions Leakage Location Based On Hydraulic Model Calibration Of Water Supply Network

The construction of a hydraulic model of the water supply network is the basis for the scientific management of the water supply system,and the calibration of the model is an important part of determining whether the model can be put into use properly.On this basis,the study on the optimal layout of water supply network pressure monitoring points and the location of leakage in multi-conditions can provide certain technical support for the construction of the "smart water" platform,which is of great significance for the sustainable development of society.(1)This study uses a part of the actual water supply network in the CYW district of a coastal city in eastern China as a case study.The hydraulic model of the water supply network is constructed based on the basic information collected from the preliminary research,and the work of collecting the basic data of the water supply network,simplifying the topology of the network,distributing the water demand at the nodes and determining the initial value of the friction coefficient of the pipe section is completed in order.(2)For the water supply network hydraulic model calibration problem,the hydraulic model of water supply network in CYW district is used as a case study,and some important pipe sections are selected as the calibration objects by combining with the sensitivity analysis method of friction coefficient,and the minimum error between the measured and simulated values of the nodal pressure and pipe flow are taken as the optimization objectives to build the multi-objective calibration model of water supply network,and the model is solved by combining with NSGA-II algorithm.The results show that 58.33% of the pressure monitoring points have a monitoring error of ±1 m or less,91.67% of the pressure monitoring points have a monitoring error of less than ±2 m,100% of the pressure monitoring points have a monitoring error of less than ±4 m,and all the flow monitoring points have a monitoring error of less than 5%,which is fully in line with the domestic calibration standards.(3)For the optimal layout of pressure monitoring points,this study quantifies the nodal pressure correlation and nodal pressure sensitivity of the water supply network as constraints,and constructs a multi-objective optimal layout mathematical model for pressure monitoring points with the maximization of the monitoring range and water coverage of the scheme as the optimization objectives,respectively,and solves it using the NSGA-II algorithm.The Pareto frontier solution set contains four options,of which Option 3 has a monitoring coverage of 81.76% while taking into account 94.04% of the nodal water coverage.After comprehensive consideration,this option is determined as the final layout scheme of this case.(4)For the traditional water supply network leakage location model,this study attempts to solve the pipe network leakage location problem using a multi-objective optimization method.A multi-objective optimization model for water supply network leakage location based on NSGA-II algorithm was constructed by minimizing the errors between measured and simulated values of nodal pressure and pipe flow,respectively.The results show that the topological distance between the model location results and the actual leak is stable to within 2 units for both single and double leak incidents.This indicates that the proposed model can effectively narrow the search area,which can provide some technical support for water supply network leakage control and management,and provide effective reference for subsequent leak detection work.