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Locating Outfalls on Meandering Channels to Optimise Transverse Mixing

ABSTRACT

Many sources of river pollution approximate steady-state conditions and, under such conditions, the rate of transverse mixing is critical in determining the impact of pollutants. Results are presented from transverse-mixing experiments which were carried out on a large-scale laboratory channel with meander planform geometry of natural cross-section, generated by flow over a mobile bed. Dye-tracer measurements below three point sources within one cross-section are presented and compared, together with hydrodynamic measurements. The results show the importance of locating outfalls to maximise mixing rates, hence minimising pollution impact (depending on the environmental need). A release on the outside of a bend is shown to result in a faster rate of transverse mixing than a release on the inside of a bend.

 

AUTHORS
J. B. Boxall, MEng, PhD - Research Associate and Senior Lecturer, respectively, Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK.
 
I. Guymer, BSc, PhD, CEng (Member) - Research Associate and Senior Lecturer, respectively, Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK.
 
A. Marion, MSc, PhD - Assistant Professor, Department of Hydraulics, Maritime and Geotechnical Engineering, University of Padua, Italy.
 
 
 
PUBLICATION

Water and Environment Journal Volume 16 Issue 3, Pages 194 - 198

 
 
KEYWORDS
Dispersion • open-channel flow • outfall • pollution • transverse mixing