Annual water residence time effects on thermal structure:A potential lake restoration measure?

Olsson, Freya and Mackay, Eleanor B and Moore, Tadhg and Barker, Phil and Davies, Sian and Hall, Ruth and Spears, Bryan and Wilkinson, Jayne and Jones, Ian D (2022) Annual water residence time effects on thermal structure:A potential lake restoration measure? Journal of environmental management, 314. ISSN 1095-8630

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Innovative methods to combat internal loading issues in eutrophic lakes are urgently needed to speed recovery and restore systems within legislative deadlines. In stratifying lakes, internal phosphorus loading is particularly problematic during the summer stratified period when anoxia persists in the hypolimnion, promoting phosphorus release from the sediment. A novel method to inhibit stratification by reducing residence times is proposed as a way of controlling the length of the hypolimnetic anoxic period, thus reducing the loading of nutrients from the sediments into the water column. However, residence time effects on stratification length in natural lakes are not well understood. We used a systematic modelling approach to investigate the viability of changes to annual water residence time in affecting lake stratification and thermal dynamics in Elterwater, a small stratifying eutrophic lake in the northwest of England. We found that reducing annual water residence times shortened and weakened summer stratification. Based on finer-scale dynamics of lake heat fluxes and water column stability we propose seasonal or sub-seasonal management of water residence time is needed for the method to be most effective at reducing stratification as a means of controlling internal nutrient loading. [Abstract copyright: Copyright © 2022 The Authors. Published by Elsevier Ltd.. All rights reserved.]

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Journal Article
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Journal of environmental management
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10 May 2022 12:35
Last Modified:
04 Jan 2023 03:45