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Equivalent roughness height for plane bed under steady flow

Camenen, Benoit LU ; Bayram, Atilla and Larson, Magnus LU (2006) In Journal of Hydraulic Engineering 132(11). p.1146-1158
Abstract
This paper presents a new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under steady current conditions. In order to derive such a formula, a large data base involving plane-bed experiments was compiled from previous investigations and analyzed. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also made. A relationship with the Shields parameter only, which is commonly proposed, appeared to be insufficient. The roughness was also found to be a function of a Froude number and a dimensionless settling velocity. A critical Shields parameter was identified up to which the equivalent roughness ratio is... (More)
This paper presents a new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under steady current conditions. In order to derive such a formula, a large data base involving plane-bed experiments was compiled from previous investigations and analyzed. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also made. A relationship with the Shields parameter only, which is commonly proposed, appeared to be insufficient. The roughness was also found to be a function of a Froude number and a dimensionless settling velocity. A critical Shields parameter was identified up to which the equivalent roughness ratio is proportional to the Shields parameter. The new empirical equation that was developed yields the best results for all conditions investigated, and should improve the understanding of the total shear stress. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
steady flow, experimental data, sheet flow, roughness, shear stress
in
Journal of Hydraulic Engineering
volume
132
issue
11
pages
1146 - 1158
publisher
American Society of Civil Engineers (ASCE)
external identifiers
  • wos:000241572400004
  • scopus:33750112581
ISSN
1943-7900
DOI
10.1061/(ASCE)0733-9429(2006)132:11(1146)
language
English
LU publication?
yes
id
51ca8e93-285f-4d7f-b935-bf673c603d41 (old id 378811)
date added to LUP
2016-04-01 16:19:55
date last changed
2021-10-03 04:43:10
@article{51ca8e93-285f-4d7f-b935-bf673c603d41,
  abstract     = {This paper presents a new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under steady current conditions. In order to derive such a formula, a large data base involving plane-bed experiments was compiled from previous investigations and analyzed. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also made. A relationship with the Shields parameter only, which is commonly proposed, appeared to be insufficient. The roughness was also found to be a function of a Froude number and a dimensionless settling velocity. A critical Shields parameter was identified up to which the equivalent roughness ratio is proportional to the Shields parameter. The new empirical equation that was developed yields the best results for all conditions investigated, and should improve the understanding of the total shear stress.},
  author       = {Camenen, Benoit and Bayram, Atilla and Larson, Magnus},
  issn         = {1943-7900},
  language     = {eng},
  number       = {11},
  pages        = {1146--1158},
  publisher    = {American Society of Civil Engineers (ASCE)},
  series       = {Journal of Hydraulic Engineering},
  title        = {Equivalent roughness height for plane bed under steady flow},
  url          = {http://dx.doi.org/10.1061/(ASCE)0733-9429(2006)132:11(1146)},
  doi          = {10.1061/(ASCE)0733-9429(2006)132:11(1146)},
  volume       = {132},
  year         = {2006},
}