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

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dc.contributor.author Silvonen, Soila
dc.contributor.author Niemistö, Juha
dc.contributor.author Csibrán, Adrián
dc.contributor.author Jilbert, Tom
dc.contributor.author Torma, Péter
dc.contributor.author Krámer, Tamás
dc.contributor.author Nurminen, Leena
dc.contributor.author Horppila, Jukka
dc.date.accessioned 2021-03-01T07:23:02Z
dc.date.available 2021-03-01T07:23:02Z
dc.date.issued 2021-02-10
dc.identifier.citation 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
dc.identifier.other PURE: 157102004
dc.identifier.other PURE UUID: 032d9c0c-d296-462e-bd19-b935079b7db2
dc.identifier.other WOS: 000600786700091
dc.identifier.other ORCID: /0000-0003-3516-5596/work/90050374
dc.identifier.other ORCID: /0000-0001-8165-0168/work/90051988
dc.identifier.uri http://hdl.handle.net/10138/327259
dc.description.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. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof The Science of the Total Environment
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1181 Ecology, evolutionary biology
dc.subject 1172 Environmental sciences
dc.subject Lake restoration
dc.subject Phosphorus
dc.subject Sediment
dc.subject Eutrophication
dc.subject Internal loading
dc.subject Thermal stratification
dc.subject PORE-WATER
dc.subject IRON
dc.subject DIAGENESIS
dc.subject MANGANESE
dc.subject SULFUR
dc.title A biogeochemical approach to evaluate the optimization and effectiveness of hypolimnetic withdrawal en
dc.type Article
dc.contributor.organization Ecosystems and Environment Research Programme
dc.contributor.organization Lake Ecosystem Dynamics
dc.contributor.organization Aquatic Biogeochemistry Research Unit (ABRU)
dc.contributor.organization Faculty Common Matters
dc.contributor.organization Helsinki Institute of Sustainability Science (HELSUS)
dc.contributor.organization Leena Nurminen / Principal Investigator
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.scitotenv.2020.143202
dc.relation.issn 0048-9697
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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