Research Article
Apr 1976
Longitudinal Dispersion for Flow over Rough Beds
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VIEW THE REPLYAuthors: Nabil D.Abd El-Hadi and Kersi S. DavarAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 102, Issue 4
Abstract
The longitudinal dispersion coefficient, DL, is evaluated on the basis of a one-dimensional analysis as affected by large bed roughness in a laboratory flume. The experimental results have shown that the dimensionless dispersion coefficient, DL/Yu*, in which Y is the water depth and u* is the bed shear velocity, is a function of the relative roughness height, Y/h, and the relative roughness spacing, X/Y. It is also found that DL/Yu* reaches a maximum value at a roughness density h/X = 0.111. The commonly used equation for estimating the longitudinal dispersion coefficient (DL = C Yu*) is also examined. It is found that this straight line relation between DL and Yu* is no longer valid for values of Yu* greater than 0.1 sq ft per sec (0.009 m²/s).
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Published In
Journal of the Hydraulics Division
Volume 102 • Issue 4 • April 1976
Pages: 483 - 498
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Apr 1976
Published online: Feb 3, 2021
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Nabil D.Abd El-Hadi
Qrad. Student, Dept. of Civ. Engrg., Univ. of New Brunswick, Fredericton, N.B., Canada
Kersi S. Davar
Prof., Dept. of Civ. Engrg., Univ. of New Brunswick, Fredericton, N.B., Canada
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