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Longitudinal Dispersion for Flow over Rough Beds
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 It is found that this straight line relation between DL and Yu* is no longer valid for values of Yu* greater than 0.1 sq ft per sec (0.009 m²/s).
Longitudinal Dispersion for Flow over Rough Beds
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 It is found that this straight line relation between DL and Yu* is no longer valid for values of Yu* greater than 0.1 sq ft per sec (0.009 m²/s).
Longitudinal Dispersion for Flow over Rough Beds
El-Hadi, Nabil D.Abd (author) / Davar, Kersi S. (author)
Journal of the Hydraulics Division ; 102 ; 483-498
2021-01-01
161976-01-01 pages
Article (Journal)
Electronic Resource
Unknown
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