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

Marriott, Martin John and Jayaratne, Ravindra (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.

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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.

Item Type: Conference or Event Item (Paper)
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.
Divisions: Schools > Architecture Computing and Engineering, School of
Depositing User: Mr Stephen Grace
Date Deposited: 25 Aug 2010 15:00
Last Modified: 15 Oct 2012 12:14
URI: http://hdl.handle.net/10552/957

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