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Impact of representation of hydraulic structures in modelling a Severn barrage

Bray, Samuel, Ahmadian, Reza and Falconer, Roger Alexander 2016. Impact of representation of hydraulic structures in modelling a Severn barrage. Computers & Geosciences 89 , pp. 96-106. 10.1016/j.cageo.2016.01.010

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Abstract

In this study, enhancements to the numerical representation of sluice gates and turbines were made to the hydro-environmental model Environmental Fluid Dynamics Code (EFDC), and applied to the Severn Tidal Power Group Cardiff-Weston Barrage. The extended domain of the EFDC Continental Shelf Model (CSM) allows far-field hydrodynamic impact assessment of the Severn Barrage, pre- and post-enhancement, to demonstrate the importance of accurate hydraulic structure representation. The enhancements were found to significantly affect peak water levels in the Bristol Channel, reducing levels by nearly 1 m in some areas, and even affect predictions as far-field as the West Coast of Scotland, albeit to a far lesser extent. The model was tested for sensitivity to changes in the discharge coefficient, Cd, used in calculating discharge through sluice gates and turbines. It was found that the performance of the Severn Barrage is not sensitive to changes to the Cd value, and is mitigated through the continual, rather than instantaneous, discharge across the structure. The EFDC CSM can now be said to be more accurately predicting the impacts of tidal range proposals, and the investigation of sensitivity to Cd improves the confidence in the modelling results, despite the uncertainty in this coefficient.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Engineering
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords: Hydraulic structures; Hydraulics & hydrodynamics; Barrages; Tidal power; Discharge coefficient
Publisher: Elsevier
ISSN: 0098-3004
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 25 January 2016
Last Modified: 19 Oct 2019 03:17
URI: http://orca-mwe.cf.ac.uk/id/eprint/86067

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