Databank

Databank

Posiva publishes Working Reports and Posiva Reports. From the year 2006 nearly all the reports have been published on our webpage and they can be found in the databank. In the databank you can also find our Annual Reviews and some other publications as well. You can also find print-quality pictures and useful links in the databank.

Recent publications


Workreport 2017-12

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Name:

Studies on the Aquatic Environment at Olkiluoto and Reference Area: 5. Reference Lakes in 2013–2014

Writer:

Kirkkala, T., Mikkilä, E., Koivunen, S.

Language:

English

Page count:

132

Summary:

This working report presents the results of Posiva’s sampling campaigns in Lakes Poosjärvi and Kivijärvi, Finland, in 2013–2014. These so-called reference lakes are considered to resemble the aquatic systems expected to form at the Olkiluoto repository site due to the post-glacial land uplift in a time scale relevant to deep disposal of nuclear waste. The aim of the studies was to continue the sampling campaign started in 2010 in order to improve the knowledge of the lake ecosystems and to produce new input data to the modelling underpinning the repository safety cases. The studies from other reference lakes Koskeljärvi and Lutanjärvi are published in the Posiva Working Report 2016-50.

In the field campaign, a main objective was to estimate the areal biomass distribution and measure the dimensions of both the characteristic aquatic plants and animals. Another main objective was to estimate the transfer of different indigenous elements, (especially C-14, Cl, I, Sr, Mo, Ag, Se, Nb, Cs, Ni, Pd, Pb and Sn) considered analogues for their long-lived radioisotopes in the safety case modelling, from the water to aquatic organisms, as well as to estimate their sorption into the surface sediment. Surface water, plankton, sediment, macrophyte, macrobenthos, mussel and fish samples were collected for biomass and dimension measurements and for analysis of their element composition. In addition, water-to-biota concentration ratios and element distribution coefficients (Kd) in the sediment were calculated. The sampling procedures, pre-treatment methods and analytical methods were basically similar to methods used in pervious studies.

Keywords:

Water quality; surface sediment; aquatic macrophytes; fish; macrobenthos; biomass; body dimensions; element concentration; water-to-biota concentration ratio; solid/liquid distribution coefficient (Kd); biosphere assessment; safety case

File(s):

WR 2017-12_web (pdf) (7.7 MB)


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