Research Article
Jan 1973
Longitudinal Dispersion in Sinuous Channels
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VIEW THE REPLYPublication: Journal of the Hydraulics Division
Volume 99, Issue 1
Abstract
The longitudinal spreading of tracer solution and the distribution of velocity are investigated experimentally in a laboratory flume having a series of 13 uniform bends in alternating directions. Viewing the tracer cloud as a whole, the dispersion process behaves like a one-dimensional diffusion process, as in a straight channel. The dispersion coefficient is larger, and the initial convective period is shorter than in an equivalent straight channel. From the perspective of a single cross section, however, the process is periodic. The convective dispersion coefficient attains a maximum at about the middle of each bend, a minimum between bends, and lags the mean square velocity deviation by about a quarter of a bend. Analysis of the flume data together with available river data indicates that the dispersion coefficient tends to increase with increasing radius of curvature, and decrease with increasing bend length and depth.
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Published In
Journal of the Hydraulics Division
Volume 99 • Issue 1 • January 1973
Pages: 195 - 217
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© 1973 American Society of Civil Engineers.
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Published in print: Jan 1973
Published online: Feb 3, 2021
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Shoji Fukuoka, AM.ASCE
Queen's Fellow of Australian Inst. of Marine Sci., Dept. of Engrg., James Cook Univ. of North Queensland, Australia
William W. Sayre, M.ASCE
Research Engr., Inst. of Hydraulic Research, and Prof., Dept. of Mech. and Hydr., The Univ. of Iowa, Iowa City, Iowa
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