A biogeochemical approach to evaluate the optimization and effectiveness of hypolimnetic withdrawal

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http://hdl.handle.net/10138/327259

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Silvonen , S , Niemistö , J , Csibrán , A , Jilbert , T , Torma , P , Krámer , T , Nurminen , L & Horppila , J 2021 , ' A biogeochemical approach to evaluate the optimization and effectiveness of hypolimnetic withdrawal ' , The Science of the Total Environment , vol. 755, Part 2 , 143202 . https://doi.org/10.1016/j.scitotenv.2020.143202

Title: A biogeochemical approach to evaluate the optimization and effectiveness of hypolimnetic withdrawal
Author: Silvonen, Soila; Niemistö, Juha; Csibrán, Adrián; Jilbert, Tom; Torma, Péter; Krámer, Tamás; Nurminen, Leena; Horppila, Jukka
Contributor: University of Helsinki, Ecosystems and Environment Research Programme
University of Helsinki, Faculty Common Matters
University of Helsinki, Ecosystems and Environment Research Programme
University of Helsinki, Ecosystems and Environment Research Programme
University of Helsinki, Ecosystems and Environment Research Programme
Date: 2021-02-10
Language: eng
Number of pages: 14
Belongs to series: The Science of the Total Environment
ISSN: 0048-9697
URI: http://hdl.handle.net/10138/327259
Abstract: Hypolimnetic withdrawal (HW) is a lake restoration method that is based on the removal of phosphorus (P) along with near-bottom water. While it has often proven to be effective, the method also sets challenges: it is about balancing between effective P removal and maintenance of the thermal stratification of the lake. The success of different HW projects has been reviewed in some studies retrospectively, but scientific literature still lacks studies that use detailed data on the lake biogeochemistry to scale and optimize the method in advance, and to predict the outcomes of the restoration measure. In the current study, we investigated the seasonal biogeochemistry, P stocks and thermal stratification of a eutrophic lake (Lake Kymijarvi/Myllypohja basin, southern Finland) to determine an optimal withdrawal rate, to assess its effects on stratification, and to evaluate the expected success of HW. We found that by adjusting HW with P diffusive fluxes from the sediment (diffusion-adjusted HW), it is possible to remove a notable part of the cycling P without causing major disturbances to the thermal stratification even in a relatively shallow lake. Our results show that HW can have great potential in lake restoration: diffusion-adjusted HW in our study lake could increase the annual P output by 35-46%, shifting the P budget of the lake to negative. We thus propose a novel approach to optimize HW on the basis of the diffusive flux of P from the sediment, with the goal of extracting P continuously at an equivalent rate to the diffusive flux. We finally discuss how this can be achieved more effectively with HW based on a closed-circuit system. (c) 2020 The Authors. Published by Elsevier B.V.
Subject: 1181 Ecology, evolutionary biology
1172 Environmental sciences
Lake restoration
Phosphorus
Sediment
Eutrophication
Internal loading
Thermal stratification
ORGANIC-MATTER MINERALIZATION
LAKE-SEDIMENTS
PHOSPHORUS RELEASE
PORE-WATER
IRON
DIAGENESIS
MANGANESE
SULFUR
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