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Title: Manning’s ‘n’ co-efficient for flexible emergent vegetation in tandem configuration
Authors: Noarayanan, L.
Murali, K.
Sundar, V.
Issue Date: 2011
Source: Noarayanan, L., Murali, K., & Sundar, V. (2012). Manning’s ‘n’ co-efficient for flexible emergent vegetation in tandem configuration. Journal of Hydro-environment Research, 6(1), 51-62.
Series/Report no.: Journal of hydro-environment research
Abstract: A comprehensive laboratory study on the hydraulic resistance characteristics due to a group of slender cylindrical members representing flexible plantation has been carried out in a laboratory open channel. The model stem group comprised of individual members arranged in a tandem configuration. The tests with model vegetation were carried out by adopting different sizes for the individual stems and concentrations which were chosen in such a way that they would fall into practical ranges of vegetations in coastal forestry. The results indicate that the flow resistance varies with stem concentration, stem diameter and elastic properties of the individual members and the flow velocity. Based on the flume data, the Manning’s n, for various flow conditions as well as for vegetative parameters was determined. A new empirical equation is proposed for evaluating the Manning’s n friction coefficient for partially submerged flow when, the depth of flow is greater than 0.8 times the undeflected plant height. It is expected that the Manning’s n thus determined will be useful in modelling shallow flows using shallow water equations.
ISSN: 1570-6443
Rights: © 2011 International Association for Hydro-environment Engineering and Research, Asia Pacific Division.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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