Research Article
Mar 1973
Flow Resistance from Cylindrical Roughness
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VIEW THE REPLYAuthors: Soronadi Nnaji and I-pai Wu, M.ASCEAuthor Affiliations
Publication: Journal of the Irrigation and Drainage Division
Volume 99, Issue 1
Abstract
The root mean square, σ, of the heights of wires simulating crop stems is found to be a good measure for quantifying roughness of a cylindrical type. An expression is derived for σ in terms of the geometric characteristics of the elements. The Prandtl-von Karman … Universal velocity distribution equation for turbulent flow over a rough surface was adopted in the form presented by Sayre and Albertson. A relationship between the resistance parameter, X, in this latter equation and the derived σ was obtained and substantiated with data obtained from experiments performed by Wessels and Strelkoff and Fenzl. The relationship is of a power-type function and holds good for values of the resistance parameter greater than 0.0015 ft (0.0005 m). The composite resistance of the soil and vegetative roughness in the field was investigated. The percentage relative contribution of the soil to the total resistance follows an asymptotic decay curve with increasing flow depth.
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Published In
Journal of the Irrigation and Drainage Division
Volume 99 • Issue 1 • March 1973
Pages: 15 - 26
Copyright
© 1973 American Society of Civil Engineers.
History
Published in print: Mar 1973
Published online: Feb 11, 2021
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Authors
Affiliations
Soronadi Nnaji
Grad. Student, Dept. of Hydr. and Water Resour., Univ. of Arizona; formerly Grad. Research Asst., Agr. Engrg. Dept., Univ. of Hawaii, Honolulu, Hawaii
I-pai Wu, M.ASCE
Assoc. Prof., Agr. Engrg. Dept., Univ. of Hawaii, Honolulu, Hawaii
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.