Research On Leakage Location Of Water Supply Network Based On Hydraulic Model

Urban water systems are indispensable lifeline project in urban public facilities.Urban water supply system is conducive to ensuring urban construction and stabling urban economic development.social civilization and safety also be included.It also meet the basic requirements of urban residents' lives and improve the quality of residents' life.Urban water supply systems are closely related to urban development.At present,the water supply system of major cities in China due to pipeline laying period relatively long,unreasonable use pipeline materials,the exertion of geotechnical rock outside the pipe,and the construction of underground engineering around the pipeline has caused a lot problems.Leakage,and even the water supply pipe network,foundation hollow,ground sinks can be caused.Pipe network leakage can be transformed into a sudden increase in node water demand and node traffic sudden increase.Pipeline leakage make monitoring points and pressure monitoring points change at the point of leakage.under the leakage state,research pressure curve of the water supply pipe is the basis and premise for making the daily pressure monitoring data be an effective basis for the evaluation of the leakage state of the pipe network,the diagnosis and even the location of the leakage.When the newly collected pressure monitoring value and the hydraulic model simulation value deviation are too large,the pipe network leakage warning can be issued,and the difference between the pressure monitoring value and the pressure simulation value can be analyzed in erm of the optimization method.In comparison,the leakage information is reversed based on the difference between the monitored value and the simulated value to perform leak location.Firstly,input the basic data to the EPANET software to establish a topology structure.By the node equation,the pressure drop equation and the ring equation to construct the hydraulic model.The hydraulic model is calibrated by comparing the measured values of the monitoring points with the simulated values of the models.The analysis results shows that the hydraulic model established in this study can truly and accurately reflect the actual pipe network condition,and can analyze the current situation of pipe network leakage.The hydraulic model of the water supply network of H City Beicheng District was constructed by EPANET simulation software.The user database of the water supply company is combined with on-site measurement,the water users in the study area can be divided into five categories: residential water,commercial service water,industrial production water,administrative service water and special water.The typical users in each category were selected to conduct on-site water consumption measure.Through curve fitting.,the curve of water consumption change of users of various types of water was obtained.Considering the influence of Haizen-William coefficient on the water-passing capacity Tthrough field measure,the pipes with different pipe diameters,different pipeline materials and different buried years in Beicheng District were selected.And the pipeline was measured by Four-point pressure measurement method to determine the William coefficient,combined with the C values of other cities,fits the relationship between the C value of the main pipe material and the laying age.In the water supply pipe network system,if one pipeline leaks,the relative pressure at the leakage of the pipe section changes sharply,which seriously affects the operation of the pipe network.Pressure is an important parameter that can reflect the real-time operation quality of the pipe network.At the same time that the pipe network leaks,the pressure of each pipe segment also changes,resulting in changes leakage nodes upstream hydraulic distribution relationship and downstream hydraulic distribution relationship,resulting in other nodes pressure produce a big or small change.Through the simulation of the two working conditions(the daily operation of the pipe network and the occurrence of leakage),the method of optimization analysis is used to locate the leakage points.