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Dispersion in Rough Rectangular Channels
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.
Dispersion in Rough Rectangular Channels
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.
Dispersion in Rough Rectangular Channels
Valentine, Eric M. (Autor:in) / Wood, Ian R. (Autor:in)
Journal of the Hydraulics Division ; 105 ; 1537-1553
01.01.2021
171979-01-01 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Laminar flow in rough rectangular channels
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