Transient Frequency Responses for Pressurized Water Pipelines Containing Blockages with Linearly Varying Diameters
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 8
Abstract
Extended partial blockages in urban water supply systems (UWSS) are formed from complicated physical, chemical, and biological processes; thus, these blockages are commonly in random and nonuniform geometries. The transient-based blockage detection method (TBBDM) has been evidenced in many applications to be a promising way to diagnose these blockages. Despite the successful validation and application of the TBBDM in the literature, pipe blockages used in these studies were idealized and simplified to regular and uniform shape, which are however not common in practical UWSS, and thus invalidity and inaccuracy of this TBBDM has been widely observed in practical applications. This paper presents fundamental research on understanding the influence of more realistic and nonuniform blockages on transient wave behavior and the accuracy of current TBBDM. The blockage with a linearly varying diameter (termed as nonuniform blockage) is firstly investigated by the frequency domain analytical analysis for its impact on transient wave behavior, which is thereafter incorporated in the overall transfer matrix of transient frequency response for reservoir-pipeline-valve systems. The results indicate the nonuniform blockage may induce very different modification patterns on the frequency shift and amplitude change of transient waves from the uniform blockage situation.
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Acknowledgments
This research work was supported by the research grants from (1) the Hong Kong Research Grants Council (Projects Nos. T21-602/15-R, 25200616, and 15201017) and (2) the Hong Kong Polytechnic University (Projects Nos. 1-ZVCD and 1-ZVGF).
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Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 16, 2017
Accepted: Mar 12, 2018
Published online: Jun 14, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 14, 2018
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