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A Study on Manning’s Coefficient of Rigid Unsubmerged Vegetation Under Open Channel Constant Gradual Flow Condition

[+] Author Affiliations
Weigang Xu, Huayong Zhang, Yu Jing, Zhongyu Wang, Changming Ji, Hua Zhang

North China Electric Power University, Beijing, P.R. China

Paper No. IMECE2010-40786, pp. 403-408; 6 pages
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 8: Dynamic Systems and Control, Parts A and B
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4445-8
  • Copyright © 2010 by ASME


A series of experiments were carried out to study the hydraulic resistance of rigid unsubmerged vegetation in open constant gradual channel flow. Flow depth and velocity were measured in the density of 54, 108 and 202 reed stems per square meter within a range of discharge values. The results demonstrated that the back-up water height increases with the reed density, while the velocities show an opposite trend. The phenomenon can be explained by the relationship between Manning coefficient and the vegetation density parameters.

Copyright © 2010 by ASME



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