Manning’s ‘n’ co-efficient for flexible emergent vegetation in tandem configuration
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. Th...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/96886 http://hdl.handle.net/10220/11665 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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