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Locating Outfalls on Meandering Channels to Optimise Transverse Mixing

Author(s): J. B. Boxall; I. Guymer; A. Marion

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Keywords: Dispersion; Open channel flow; Transverse mixing; Pollution

Abstract: Many sources of river pollution approximate steady state conditions. Under such conditions, the rate of transverse mixing is critical in determining the impact of pollutants. Results are presented from transverse mixing experiments conducted 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 sighting 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.


Year: 2001

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