Analysis And Research Of Water Distribution Network Reliability Based On Hydraulic Model Of T City

Water supply network is an extremely important part in urban water supply system,for which can operate safely and reliably or not will directly affect people's daily life and social production.What's more,it's playing an important role in the entire water supply system which achieves full economic and social benefits.With the continuous development of modern society and people's increasing demands for water supplying security and reliability,the reliability of water supply network has attracted more and more attention.Water supply network as the final steps entering the user,its importance is self-evident,which is known as the lifeline of the city.The main subject of the research are:analysis and research of basic reliability theory,establishing the hydraulic model of the water distribution network and the checking research,and analysis and research of water distribution network reliability based on hydraulic model of T city.Firstly,it is a more comprehensive analysis of the basis reliability theory.Through the research of the basic reliability concept and function,we find that reliability of network components is in line with Exponential Distribution;analysis the three aspects of network reliability(hydraulic,water quality and structure)and it's characteristics,determine that the main object of the research are hydraulic reliability and structure reliability;structure reliability has a close relationship with different network structure form,analysis the respective reliability and weigh the relationship between the system reliability economy.Secondly it is the establishment and checking of the water supply network hydraulic model.On the basis of water supply network dynamic hydraulic model simulation theory and method,through the analysis and research of actual network state in T city,we find the node flow distribution method that apply to this city,including water portfolio and not measured water.Study the determination of water mode(water consumption variance curve)and compare two medhods and finally point out that the vertical processing method has smaller variance and more realistic.Study the working conditions of pump co-operation and gain the actual pump characteristic curve.Under the pre-checking and Darwin automatic checking,make the pressure monitoring point error in the range of ± 1m 85.71%,100%error range of ± 2m,and stisfy accuracy requirements of the hydraulic model.The established water supply network of T city has 13589 pipes,9026 nodes,3617 valves and 662 fire hydrants which lays the foundation for the reliability analysis.Finally,study water supply network reliability on the basis of hydraulic model,analysis and illustrate component reliability index and its determining method with regard to network structural reliability;consider the change of network structural,according to the change of nodes hydraulic conditions,defined the satisfaction of nodes gaining water as node reliability,and then work out that weighting coefficient method is more suitable for determinating the reliability of water supply network system.Application after the establishment of the water supply network hydraulic model,apply hydraulic model to the annlysis and research of netwok reliability,use the actual engineering case to show that the reliability of the network and have a instruction to the result,put forward the main factors influencing network reliability and measure enhancing network reliability.