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An assessment of the impacts of a tidal renewable energy scheme on the eutrophication potential of the Severn estuary, UK

Kadiri, Margaret Osikhofe, Ahmadian, Reza ORCID:, Bockelmann-Evans, Bettina Nicole ORCID:, Falconer, Roger Alexander ORCID: and Kay, David 2014. An assessment of the impacts of a tidal renewable energy scheme on the eutrophication potential of the Severn estuary, UK. Computers & Geosciences 71 , pp. 3-10. 10.1016/j.cageo.2014.07.018

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The potential impacts of ebb-only (one-way) and flood-ebb (two-way) modes of operation of a tidal barrage on the eutrophication potential of the Severn Estuary were investigated in this study using the simple modelling approach adopted by the UK's Comprehensive Studies Task Team (CSTT). The model predictions were compared against CSTT thresholds for assessing eutrophication in estuaries and coastal waters. For the no barrage scenario, as well as the ebb-only and flood-ebb operating modes, the estuary was found to be potentially eutrophic as the predicted equilibrium nutrient concentrations and potential maximum phytoplankton biomass chlorophyll concentrations exceeded the threshold limits. Potential maximum phytoplankton primary productivity under both ebb-only and flood-ebb operating modes were found to be noticeably higher than that for the no barrage scenario. This is believed to be due to a combination of increased water residence time and greater light availability behind the barrage. However, the conditions for phytoplankton production are likely to be more favourable under ebb-only operating mode as the potential for maximum phytoplankton primary production was found to be significantly increased under ebb-only operating mode, with largely decreased suspended particulate matter concentration compared to flood-ebb operating mode where only a small reduction in suspended particulate matter concentration is predicted.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Additional Information: Tidal barrage; Eutrophication; Marine renewable energy; Severn Estuary; Primary production
Publisher: Elsevier
ISSN: 0098-3004
Last Modified: 27 Oct 2022 08:40

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