| Leakage and pipe burst are common problems faced by water supply enterprises.They not only waste a lot of valuable water resources,but also make water supply enterprises suffer huge economic losses,endangering citizens’ lives,property and social environment.Taking a water supply system in a region in North China as the research object,this paper analyzes the causes of leakage and pipe burst accidents,constructs a hydraulic model of urban water supply network,realizes the layout of flow and pressure monitoring points of urban water supply network,evaluates the leakage and pipe burst of the network respectively,and comprehensively evaluates the operation safety function of urban water supply network by combining the two The combination of static factors and dynamic factors can provide reliable scientific theoretical support for solving the leakage and explosion problems of urban water supply network in the future,so as to comprehensively improve the safety of urban water supply network.In order to realize the layout of flow and pressure monitoring points of urban water supply network,the hydraulic model of water supply network is built based on EPANET software,and the DMA partition is combined with the existing flow monitoring points to realize the inflow and outflow monitoring of each partition network,which provides convenience for the dynamic operation of the network,the later leakage and burst monitoring of the network;according to the hydraulic calculation principle and the structure characteristics of the network,The sensitivity matrix equation is listed,the sensitivity coefficient matrix is obtained,the nodes are sorted according to the diagonal data size of the sensitivity matrix,and the pressure monitoring points are preliminarily determined.Then,the nodes with Pearson correlation coefficient greater than 0.7 are taken as the strong correlation points,and the strong correlation points are divided into a group.The nodes with the greatest sensitivity are selected as the monitoring points,and other nodes are taken as the monitoring range to realize pressure monitoring Arrangement of measuring points.This dissertation discusses the calculation method of leakage model with pressure as driving factor in detail,calculates the leakage coefficient of nodes according to the real leakage amount in the zone,simulates the leakage situation at different times,and the results are in good agreement;and analyzes the leakage situation of the whole pipe network,and obtains the more severe area and pipe section,and the overall score of the leakage of the pipe network is 4.36 points.Combined with the analysis of the structural factors and the hydraulic dynamic factors of the pipe network,seven factors including the pipe material,pipe diameter,pipe age,interface mode,buried depth,flow velocity and pressure of the pipe are selected for the correction and normalization tests of weight and AHP.The proportions of the seven factors are 0.324,0.238,0.086,0.104,0.043,0.054 and 0.151 respectively.The seven influencing factors of the pipe network are divided into five levels After scoring,the overall score of the pipeline is 3.56,and 70%of the pipe sections perform well(score is greater than 3 points);the score of the large flow main pipe of the pipe network is relatively high,with good safety;the score of the small diameter pipe section and the pipe network end pipe section is relatively low,which should be focused on daily to prevent pipe network explosion.The comprehensive evaluation of the operation safety of urban water supply network is carried out by combining the leakage of the network with the evaluation results of pipe burst.The comprehensive score of the network is 3.96.The evaluation scheme can be used as an effective reference for the management and maintenance of pipeline leakage and explosion prevention. |
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