Research On Leakage Detection Of Existing Water Supply Network Systems

Water supply network system,as the main transportation method of urban water,is an essential infrastructure of the city.It plays an important role in ensuring people's livelihood and economic development,and has an overall and pilot influence on urban development.In recent years,the monitoring of the operating status and leakage detection of the water supply network system has become one of the major concerns of the society.At present,the application of distributed fiber optic technology in the monitor of new-built pipelines is relatively mature,while technic for numbers of existing pipelines becomes a new direction worthy of research and development.This paper proposes a study of leakage identification and location of existing urban water supply pipelines based on pressure signals and flow signals,and try to discuss and improve the key technologies of this method through experimental verification and analysis on urban pipeline simulated leakage test platform,attempting to improve leakage detection location accuracy of the method.The main research content includes the following sections:(1)Through theoretical analysis,the method for identifying and locating the leakage based on pressure and flow signals is demonstrated;the characteristics of negative pressure waves and the method of leakage location based on negative pressure wave delay estimation are discussed in detail;Introduction of auxiliary flow discrimination reduces the error rate of leakage detection.(2)Determine the basic theory and similarity criteria for similar design of urban pipeline simulated leakage test platform;establish similar parameters and calculate the value of each physical quantity model;set up the real simulated leakage test platform,and various validate and adjust physical parameters of the model by a series of pre-experiment.(3)Through the leakage test platform,simulated leakage experiments were conducted to examine the influence of various related factors on the results of leakage identification and location based on pressure signals and flow signals;the research and comparison of differences between wavelet-based and STA/LTA data processing methods were focused,trying to improve the signal analysis method.This experiment studies the method of identifying and locating pipeline leakage based on pressure and flow signals through a simulation test.Point out the key technical problems and discuss the causes and solutions to improve the accuracy of the leak detection of this method.