Hydraulic roughness – links between Manning’s coefficient, Nikuradse’s equivalent sand roughness and bed grain size

Conference paper


Marriott, M. and Jayaratne, R. 2010. Hydraulic roughness – links between Manning’s coefficient, Nikuradse’s equivalent sand roughness and bed grain size. Advances in Computing and Technology 2010. University of East London, London London University of East London, School of Architecture Computing and Engineering. pp. 27-32
AuthorsMarriott, M. and Jayaratne, R.
TypeConference paper
Abstract

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.

Keywordssediment grain diameter; friction formulae; river engineering; drainage applications
Year2010
ConferenceAdvances in Computing and Technology 2010
PublisherUniversity of East London, School of Architecture Computing and Engineering
Accepted author manuscript
License
CC BY-ND
Publication dates
PrintJan 2010
Publication process dates
Deposited25 Aug 2010
Web address (URL)http://hdl.handle.net/10552/957
Additional information

Citation:
Marriott, M.J. and Jayaratne, R. (2010) ‘Hydraulic roughness - links between Manning’s coefficient, Nikuradse’s equivalent sand roughness and bed grain size’ Proceedings of Advances in Computing and Technology, (AC&T) The School of Computing and Technology 5th Annual Conference, University of East London, pp. 27-32.

Place of publicationLondon
Page range27-32
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