Simple Modification of Manning-Strickler Formula for Large-Scale Roughness
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 9
Abstract
Large-scale roughness renders the flow resistance underestimated with the Manning-Strickler (MS) formula. This can be corrected simply by considering the roughness-induced flow constriction. Two modified MS formulas have been therefore derived for pipe and open-channel flows, respectively. They are applicable for small- to large-scale roughness. Without making any adjustment of the constants involved, both formulas are successfully validated by experimental data, particularly for flows significantly affected by the large-scale roughness.
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Acknowledgments
The experiments were conducted in the Hydraulic Laboratory of the School of Civil and Environmental Engineering, Nanyang Technoloical University. The data were collected with the great help of undergraduate students Stephen Franseda Wijaya, Lin Wanxi, Jeslyn Toh Jie Ying, and Richard Widjaja, and technician Lim Kok Hin.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 21, 2016
Accepted: Mar 13, 2017
Published online: Jun 9, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 9, 2017
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