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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Simple modelling approach for assessing the impacts of a tidal lagoon and tidalbarrage on the eutrop...
Simple modelling approach for assessing the impacts of a tidal lagoon and tidalbarrage on the eutrophic status of the severn estuary, uk
Author : KADIRI, M.(1), XIA, J.(2), FALCONER, R. A.(1) & BOCKELMANN-EVANS, B.(1)
ABSTRACT
Tidal renewable energy schemes are designed to extract the energy from tidal energy resource and convert it into
electricity using structures such as tidal barrages and tidal lagoons, where low head turbines are encapsulated in
impoundment structures. This study uses a simple modelling approach to assess the impacts of a tidal lagoon and a tidal
barrage on the eutrophic status of the Severn Estuary, UK. The model predictions are compared against CSTT thresholds
for assessing eutrophication in coastal waters. The estuary was found to be potentially eutrophic both without and with the
barrage and lagoon as the predicted equilibrium dissolved nutrient concentrations and potential phytoplankton biomass
exceeded the CSTT thresholds. Potential primary productivity in the estuary without the structures was found to be
significantly lower compared to those with the barrage and lagoon. This is due to a combination of increased residence
time of nutrients in the water column and light availability with the structures. However, the conditions for phytoplankton
growth are likely to be more favorable in the estuary with a barrage as the potential maximum primary production was
found to be about an order of magnitude greater in the estuary with a barrage compared to that with a lagoon.
File Size : 223,182 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 20/08/2015
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