Diameter and Surcharge Effects on Solute Transport across Surcharged Manholes
Publication: Journal of Hydraulic Engineering
Volume 131, Issue 4
Abstract
New data are presented describing the retention time and longitudinal dispersion of a solute tracer across circular surcharged manhole structures of different diameters. The variations with both discharge and surcharge level are described and the relationships quantified. The variation of the longitudinal dispersion coefficient exhibits poorly defined trends, however using an aggregated dead zone technique both the reach time delay and travel time show clear variations. A surcharge threshold level for these parameters is evident at the larger manhole diameters and this is explained in relation to jet theory. The variation of the surcharge mean time delay and postthreshold mean travel time are quantified, while the prethreshold travel times are shown to be dependent on both discharge and surcharge. The relationships allow for inclusion in sewer water quality modeling and provide a method for improving predictive techniques.
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Acknowledgments
This research was supported by the United Kingdom Science and Engineering Research Council Research Grant (Ref. No. GR/H43366), entitled “Dispersion of Solutes and Sediments in Urban Drainage Systems.” Mr. C. Saiyudthong was supported by the Thai government.
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Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 4 • April 2005
Pages: 312 - 321
Copyright
© 2005 ASCE.
History
Received: Aug 16, 2002
Accepted: Jul 21, 2004
Published online: Apr 1, 2005
Published in print: Apr 2005
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