Study On Network Leakage Region Determination And Leakage Estimation In Urban Water Supply System

Leakage is a ubiquitous issue in water industry, not only wastes precious water resources and courses economic losses but also makes water supply into low pressure, reduces the security of pipe and brings disaster to residents. Leakage control which is one of the important compose of operating systemic in water supply is a question that should be solved all the while.Put detection of leakage and exact determination of leakage region combine with computer which charges the network at all times, give an alarm and analyse, detect the region of leakage and reckon the leakage flow, so that repair to water supper network at fist time. Base on the aim, trend-surface analysis simulate the network pressure in this task is proposed, with its analysis of the pressure data, according to the feedback information of network pressure points to build up the model of pressure, according to the result of data processing and painting the trends chart and difference chart to reflect the real-time status of network, by the changes of pressure in network to find the abnormal region, realize the check of the network all time.The main conclusions and new innovations of this research are as follows:(1) The apparatus and methods using at present are lingering in time that the leakage in the network can't be controlled properly. This article has analyzed distribution of pressure in water supply network and considered that the changes of pressure of the network with time and space follow an obvious time trend and space trend, so they conform to the principle of trend-surface analysis. Further more, when there is an emergency in the network, the trend of the pressure can bring trend deviation because of damage. Accordingly, determine leakage region using trend-surface analysis is proposed.(2) From the examples, this paper in-depth studies different forms of water supply network (tree networks, looped networks), different forms of water source (single-source, multi-source), the leakage of different parts (of the internal network, edge) and different leakage flow of the various leakage under the network flow analysis, and each methods of trend-surface analysis are cone true.(3) This paper analysis the various forms of leakage model and its application, through leakage model, the estimation methods of leakage flow and the combination of leakage model to balance the pressure with regulating valve to reduce the leakage flow are proposed.