Research Article
Oct 1977
Transverse Dispersion in Rectangular Channels
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VIEW THE REPLYAuthors: Y. Lam Lau and Bommanna G. KrishnappanAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 103, Issue 10
Abstract
Dimensional analysis shows that the commonly used dimensionless transverse dispersion coefficient, ez/uda*h, should depend on both the friction factor and the width-to-depth ratio of the flow. Results for ez lead to the conclusion that secondary circulation, and not turbulent diffusion, is the dominant transport mechanism. These results help to explain the failure to find consistent trends in the variation of ez/u*h and suggest that u*h is not a good representation for ez. Two alternative dimensionless dispersion coefficients, ezuW and ez/uda*W, are introduced. Both appear to account for secondary circulation effects more properly. The dimensionless parameter ez/uda*W is a function of the width-to-depth ratio and appears to be affected only slightly by variations in the friction factor. The parameter ez/uW shows distinct dependence on both friction factor and width-to-depth ratio. Both of these are better dimensionless transverse dispersion coefficients to use than ez/uda*h.
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Published In
Journal of the Hydraulics Division
Volume 103 • Issue 10 • October 1977
Pages: 1173 - 1189
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Oct 1977
Published online: Feb 3, 2021
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Y. Lam Lau
Head, Hydr. Sect., Hydr. Research Div., Canada Centre for Inland Waters, Burlington, Ontario, Canada
Bommanna G. Krishnappan
Research Scientist, Hydr. Sect., Hydr. Research Div., Canada Centre for Inland Waters, Burlington, Ontario, Canada
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