Research Article
Sep 1963
Natural Roughness Effects in Rigid Open Channels
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VIEW THE REPLYAuthors: A. G. Mirajgaoker, AM.ASCE, and K. L. N. CharluAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 89, Issue 5
Abstract
The studies conducted to investigate the effects of large natural roughness in open channel flow are reported. There was an attempt to create conditions of boulder streams by fixing natural stones, from 2-1/2 in. to 3 in. in diameter, to the bed of a 3-ft wide rigid bed flume. Six different patterns of boulder placements were tried, and the roughness densities varied from 15 stones per sq yd to 114 stones per sq yd. It was observed that the Chezy's resistance function and the relative roughness parameter are related by a logarithmic formula and that the general resistance diagram, relating the resistance function and the Reynolds number, is also applicable for large natural roughness elements. A new roughness density parameter is introduced herein which was found to have a consistent relation with the resistance function, and which indicates the number of stones per unit area of the channel bed. Results have been compared with the previous investigators who have conducted experiments with idealized geometrical elements.
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Published In
Journal of the Hydraulics Division
Volume 89 • Issue 5 • September 1963
Pages: 29 - 44
Copyright
© 1963 American Society of Civil Engineers.
History
Published in print: Sep 1963
Published online: Feb 3, 2021
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Authors
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A. G. Mirajgaoker, AM.ASCE
Reader in Civ. Engrg., Univ. of Roorkee, Roorkee, India
K. L. N. Charlu
Lecturer in Civ. Engrg., College of Engineering, Anantapur, India
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