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    Drag coefficient modelling study for flexible vegetation in open channel flow

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    Publication date
    2018-11
    Author
    Hussain, Awesar
    Pu, Jaan H.
    Hanmaiahgari, P.R.
    Keyword
    Analytical model
    Drag coefficient
    Submerged vegetation
    Flexible vegetation
    Velocity distribution
    Peer-Reviewed
    No
    
    Metadata
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    Abstract
    Vegetation remains to be an important factor that can hinder the river flow. It needs innovative management scheme, in order to adapt these changes and ensure sustainability of their multiple usages. Vegetation plays an important role in floods and droughts adaptation within river system to alleviate any flood that may propagates from river to its surrounding. Vegetation within river can also retard its flow to cause building-up of deposition, and further adding to uncertainty of water use under extreme droughts. Due to these, it is important to study and understand vegetation drag behaviour toward flow in order to prevent flood risk and water security with hydrological drought in the basin and any other negative impact caused by it. In this study, an analytical approach for river flooding has been studied by improved representation of drag coefficient CD in flow velocity distribution modelling. The analysis of flow parameters, i.e. Reynolds number, on the drag coefficient CD has been conducted. The presented model has been used and analysed in open channel flows with flexible vegetation. In modelling, the flexible vegetated channel layers were divided into vegetation, top of vegetation and water layer zones in the model. The balance of forces for each layer has been established by validation using different reported measured data. The modelling results showed reasonably corresponding prediction of velocity profile in flows with flexible vegetation.
    URI
    http://hdl.handle.net/10454/16690
    Version
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    Citation
    Hussain A, Pu JH and Hanmaiahgari PR (2018) Drag coefficient modelling study for flexible vegetation in open channel flow. At: Spain Water 2018 Conference: Adapting river management in an era of change. 15 Nov 2018, Madrid, Spain.
    Link to publisher’s version
    http://47.91.144.84:8080/tpi65/Detail?dbID=5&dbName=PROCEEDINGS&sysID=15987
    Type
    Conference paper
    Collections
    Engineering and Informatics Publications

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