This paper presents and reviews the connection between Manning‘s n and Nikuradse‘s equivalent sand roughness ks, which is well established for pipe flow in the rough turbulent region. The link with bed grain size is less clear, and a survey is made covering pipelines and channels, river and coastal engineering. It is concluded that whilst the equivalent n and ks values are useful alternatives for sewer and culvert design, the link between roughness parameters and bed grain size for river and coastal purposes should be treated with more caution, particularly because the hydraulic resistance is likely to include not only a skin friction element which depends on the grain size, but also a form drag component
A theoretically based relationship for the Darcy–Weisbach friction factor f for rough-bed open-chann...
Acknowledgements The authors wish to express their gratitude to Stephan Spiller for advice regarding...
Although there have been much research done on Manning’s roughness coefficient, n in the United Stat...
Quantifying hydraulic roughness coefficients is commonly required in order to calculate flow rate in...
Water resources and hydraulic engineering projects have been upward rapidly in all over the world, a...
Data of flume experiments with bed forms are used to analyze and compare different roughness predict...
Ubiquitous flow bedforms such as ripples in rivers and coastal environments can affect transport con...
In this experimental study the Manning’s roughness coefficient, n, is investigated in steady-uniform...
Data of flume experiments with bed forms are used to analyze and compare different roughness predict...
Although Manning's roughness coefficient is known to vary with river stage, information on this aspe...
Coefficients of roughness, n are characterized as parameters representing the channel roughness and ...
Funding Information: Financial support was provided by the EPSRC/UK grant “Bed Friction in Rough-Bed...
In river flow applications, consensus on the most appropriate roughness descriptor has yet to be fou...
Random roughness parameters are used to characterize surface microrelief. In this study, random roug...
Logarithmic and variable-power equations that use the bed D84 grain size as a roughness metric repro...
A theoretically based relationship for the Darcy–Weisbach friction factor f for rough-bed open-chann...
Acknowledgements The authors wish to express their gratitude to Stephan Spiller for advice regarding...
Although there have been much research done on Manning’s roughness coefficient, n in the United Stat...
Quantifying hydraulic roughness coefficients is commonly required in order to calculate flow rate in...
Water resources and hydraulic engineering projects have been upward rapidly in all over the world, a...
Data of flume experiments with bed forms are used to analyze and compare different roughness predict...
Ubiquitous flow bedforms such as ripples in rivers and coastal environments can affect transport con...
In this experimental study the Manning’s roughness coefficient, n, is investigated in steady-uniform...
Data of flume experiments with bed forms are used to analyze and compare different roughness predict...
Although Manning's roughness coefficient is known to vary with river stage, information on this aspe...
Coefficients of roughness, n are characterized as parameters representing the channel roughness and ...
Funding Information: Financial support was provided by the EPSRC/UK grant “Bed Friction in Rough-Bed...
In river flow applications, consensus on the most appropriate roughness descriptor has yet to be fou...
Random roughness parameters are used to characterize surface microrelief. In this study, random roug...
Logarithmic and variable-power equations that use the bed D84 grain size as a roughness metric repro...
A theoretically based relationship for the Darcy–Weisbach friction factor f for rough-bed open-chann...
Acknowledgements The authors wish to express their gratitude to Stephan Spiller for advice regarding...
Although there have been much research done on Manning’s roughness coefficient, n in the United Stat...