Research Article
Dec 1979
Dispersion in Rough Rectangular Channels
Authors: Eric M. Valentine and Ian R. Wood, M.ASCEAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 105, Issue 12
Abstract
A three-dimensional numerical model is developed from a two-dimensional solution reported previously by the writers. A rectangular smooth laboratory flume is used to verify the model without dead zones; two series of field experiments carried out in a water race are then used to test the model for two different roughness conditions. Despite the simplifications involved in the numerical model, it provides a reasonable description of the process in the channel examined. Principally, there is a delay before the Fickian-type dispersion and the dispersion coefficients are comparable with those found in the field. Although the theory has not reached a stage where it can be applied to most rivers, it does lend itself to the possibility of a classification system for dead zones in river channels and it demonstrates the importance of the trapping mechanism to the dispersion process in river channels.
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Published In
Journal of the Hydraulics Division
Volume 105 • Issue 12 • December 1979
Pages: 1537 - 1553
Copyright
© 1979 American Society of Civil Engineers.
History
Published in print: Dec 1979
Published online: Feb 3, 2021
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Eric M. Valentine
Engr., Ministry of Works and Development, Wellington, New Zealand
Ian R. Wood, M.ASCE
Prof. of Civ. Engrg., Univ. of Canterbury, Christchurch, New Zealand
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