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Equivalent roughness height for plane bed under oscillatory flow

Camenen, Benoit LU ; Larson, Magnus LU and Bayram, Atilla (2009) In Estuarine, Coastal and Shelf Science 81(3). p.409-422
Abstract
A new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under oscillatory conditions is presented. In order to derive such a relationship, a large data base encompassing plane-bed experiments was compiled from previous investigations and analyzed. Different methods to estimate the roughness height were investigated. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also performed. A relationship involving the grain size and Shields parameter only, which is commonly proposed, appeared to be insufficient to characterize the roughness. The roughness height was also found to be a function of the sediment... (More)
A new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under oscillatory conditions is presented. In order to derive such a relationship, a large data base encompassing plane-bed experiments was compiled from previous investigations and analyzed. Different methods to estimate the roughness height were investigated. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also performed. A relationship involving the grain size and Shields parameter only, which is commonly proposed, appeared to be insufficient to characterize the roughness. The roughness height was also found to be a function of the sediment density and the settling velocity. A critical Shields parameter was identified up to which the effective roughness ratio is proportional to the Shields parameter only. The new empirical equation developed in this study provides the highest predictive skill for all conditions investigated. (c) 2008 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
predictive formula, experimental data, sheet-flow, plane-bed, oscillatory flow, roughness height, friction factor
in
Estuarine, Coastal and Shelf Science
volume
81
issue
3
pages
409 - 422
publisher
Elsevier
external identifiers
  • wos:000263209300015
  • scopus:58149477478
ISSN
1096-0015
DOI
10.1016/j.ecss.2008.11.019
language
English
LU publication?
yes
id
6a146715-e722-4642-a16b-d8268731ea2f (old id 1375021)
date added to LUP
2009-05-08 13:51:59
date last changed
2017-01-01 04:56:44
@article{6a146715-e722-4642-a16b-d8268731ea2f,
  abstract     = {A new relationship between the roughness height and the main hydrodynamic and sediment parameters for plane beds under oscillatory conditions is presented. In order to derive such a relationship, a large data base encompassing plane-bed experiments was compiled from previous investigations and analyzed. Different methods to estimate the roughness height were investigated. Comparisons between the data and different existing predictive formulas for the bed roughness obtained from the literature were also performed. A relationship involving the grain size and Shields parameter only, which is commonly proposed, appeared to be insufficient to characterize the roughness. The roughness height was also found to be a function of the sediment density and the settling velocity. A critical Shields parameter was identified up to which the effective roughness ratio is proportional to the Shields parameter only. The new empirical equation developed in this study provides the highest predictive skill for all conditions investigated. (c) 2008 Elsevier Ltd. All rights reserved.},
  author       = {Camenen, Benoit and Larson, Magnus and Bayram, Atilla},
  issn         = {1096-0015},
  keyword      = {predictive formula,experimental data,sheet-flow,plane-bed,oscillatory flow,roughness height,friction factor},
  language     = {eng},
  number       = {3},
  pages        = {409--422},
  publisher    = {Elsevier},
  series       = {Estuarine, Coastal and Shelf Science},
  title        = {Equivalent roughness height for plane bed under oscillatory flow},
  url          = {http://dx.doi.org/10.1016/j.ecss.2008.11.019},
  volume       = {81},
  year         = {2009},
}