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...

全面介紹

Saved in:
書目詳細資料
Main Authors: Noarayanan, L., Murali, K., Sundar, V.
其他作者: School of Civil and Environmental Engineering
格式: Article
語言:English
出版: 2013
在線閱讀:https://hdl.handle.net/10356/96886
http://hdl.handle.net/10220/11665
標簽: 添加標簽
沒有標簽, 成為第一個標記此記錄!
實物特徵
總結: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.