Dimensionless method to characterize the mixing effects of surcharged manholes
Stovin, V. R., Guymer, I. and Lau, Shing-Tak Douglas. (2010) Dimensionless method to characterize the mixing effects of surcharged manholes. Journal of Hydraulic Engineering (Reston), Vol.136 (No.5). pp. 318-327. ISSN 0733-9429Full text not available from this repository.
Official URL: http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.00001...
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.
|Item Type:||Journal Article|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TC Hydraulic engineering. Ocean engineering
|Divisions:||Faculty of Science > Engineering|
|Journal or Publication Title:||Journal of Hydraulic Engineering (Reston)|
|Publisher:||American Society of Civil Engineers|
|Official Date:||May 2010|
|Number of Pages:||10|
|Page Range:||pp. 318-327|
|Access rights to Published version:||Restricted or Subscription Access|
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