Dimensionless Method to Characterize the Mixing Effects of Surcharged Manholes
Publication: Journal of Hydraulic Engineering
Volume 136, Issue 5
Abstract
Solute transport processes affect the performance of a wide range of water engineering structures. In the context of urban drainage, the effects of dispersion may act to reduce peak concentrations associated with intermittent discharges or cause pollutants to be retained for longer or shorter durations than mean travel times would predict. With respect to surcharged manholes, previous research employed laboratory experiments to identify best-fit parameter values for the first-order advection-dispersion equation (ADE) and aggregated dead zone (ADZ) routing models. This paper presents data from a new set of smaller-scale laboratory measurements and demonstrates that the threshold depth separating two distinct hydraulic regimes can be identified independently of scale. However, the fitted ADE and ADZ routing model parameters are not generally amenable to conventional hydraulic scaling, because the models do not provide good fits to the observed data. An alternative approach is proposed based on the cumulative residence time distribution (CRTD). This approach is shown to be scalable and practical. The solute transport characteristics of a specific configuration of a surcharged manhole are shown to be characterized by just two dimensionless CRTDs corresponding to prethreshold and postthreshold surcharge depths.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 136 • Issue 5 • May 2010
Pages: 318 - 327
Copyright
© 2010 ASCE.
History
Received: Mar 10, 2008
Accepted: Nov 12, 2009
Published online: Apr 15, 2010
Published in print: May 2010
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