Leakage Recognition And Auxiliary Location Method Of Water Supply Network Based On Hydraulic Model

The leakage accident of urban water supply network system not only causes a lot of waste of freshwater resources,but also causes environmental health problems such as ground subsidence,water pollution and so on.How to timely discover the water supply pipe network leakage accident and accurately locate the lost area to reduce the water loss of the water supply pipe network is one of the difficult problems for the water supply company.Therefore,based on the hydraulic model,this paper studies the methods of leak identification and auxiliary location of water supply network.1.An accurate water supply network hydraulic model is the basis for the subsequent optimization of pressure monitoring points based on loss identification and the establishment of a water supply network loss assisted positioning model.Therefore,this paper introduces the method and principle of establishing the hydraulic model of water supply network and the standard and procedure of checking the hydraulic model.2.Compared to flow monitoring equipment,pressure monitoring equipment is low-cost and easy to arrange.Therefore,based on the change law of water supply network pressure,this paper studies the identification of water supply network leakage.Firstly,based on the historical pressure data of water supply network in the T city,the pressure variation law under normal operation conditions such as different types of water use,different seasons of water use and different water use conditions is studied.Secondly,based on Bernoulli equation of total flow,the factors affecting the pressure change when leakage accident occurs are deduced,and the leakage accident simulation of water supply pipeline is carried out by FLUENT numerical simulation experiment.Finally,for the purpose of leak identification,an optimal layout method of pressure monitoring points based on LEAK and PSO algorithm is constructed.The results show that the pressure change of water supply network has a certain regularity.Adding a certain number of pressure monitoring points on the basis of the original pressure monitoring points can identify more leakage accidents of water supply network.3.In this paper,a leak-assisted location model is established by optimizing the location of the nodes and the injection coefficient K_i to minimize the error between the simulated pressure and flow and the measured values,and IAGA algorithm is used to solve the model.Then,a validated example is given to verify the positioning effect of the leak-assisted positioning model in terms of the number of pressure monitoring points,small leakage accidents,pipe-breaking accidents,single node leakage,multi-node leakage at the same time.The results show that the more the number of pressure monitoring points,the more reasonable the arrangement,the better the positioning effect.Compared with the small leakage accident,the model is more effective in locating the pipe-breaking accident.Compared with multi-node leakage accidents,the model is more effective in locating single-node leakage accidents.4.In this paper,an engineering example is used to verify the positioning effect of the model on pipe-breaking accidents and small leakage accidents.The results show that the location nodes optimized by the model can effectively reduce the leakage detection area,which has a certain practical significance.