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http://dx.doi.org/10.3741/JKWRA.2007.40.4.325

The Development of Dynamic Model for Long-Term Simulation in Water Distribution Systems  

Park, Jae-Hong (Dept. of Civil Eng., Semyung Univ.)
Publication Information
Journal of Korea Water Resources Association / v.40, no.4, 2007 , pp. 325-334 More about this Journal
Abstract
In this study, a long-term unsteady simulation model has been developed using rigid water column theory which is more accurate than Extended-period model and more efficient comparing with water-hammer simulation model. The developed model is applied to 24-hours unsteady simulation considering daily water-demand and water-hammer analysis caused by closing a valve. For the case of 24-hours daily simulation, the pressure of each node decreases as the water demand increase, and when the water demand decrease, the pressure increases. During the simulation, the amplitudes of flow and pressure variation are different in each node and the pattern of flow variation as well as water demand is quite different than that of KYPIPE2. Such discrepancy necessitates the development of unsteady flow analysis model in water distribution network system. When the model is applied to water-hammer analysis, the pressure and flow variation occurred simultaneously through the entire network system by neglecting the compressibility of water. Although water-hammer model shows the lag of travel time due to fluid elasticity, in the aspect of pressure and flow fluctuation, the trend of overall variation and quantity of the result are similar to that of water-hammer model. This model is expected for the analysis of gradual long-term unsteady flow variations providing computational accuracy and efficiency as well as identifying pollutant dispersion, pressure control, leakage reduction corresponding to flow-demand pattern, and management of long-term pipeline net work systems related with flowrate and pressure variation in pipeline network systems
Keywords
unsteady flow; pipe network; rigid water column theory; long-term analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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