Modelling the evolution of hydrochemical conditions in the Fennoscandian Shield during Holocene time using multidisciplinary information |
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| Authors: | S Follin MB Stephens M Laaksoharju A-C Nilsson JAT Smellie E-L Tullborg |
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| Institution: | 1. SF GeoLogic AB, Propellervägen 6A, SE 183 62 Täby, Sweden;2. Geological Survey of Sweden, Box 670, SE 751 28 Uppsala, Sweden;3. GeoPoint AB, Fridshyddevägen 15, SE 191 36 Sollentuna, Sweden;4. Geosigma AB, Box 894, SE 751 08 Uppsala, Sweden;5. Conterra AB, Box 8180, SE 104 20 Stockholm, Sweden;6. Terralogica AB, Box 4140, SE 443 14 Gråbo, Sweden |
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| Abstract: | Three-dimensional, large-scale models for groundwater flow and solute transport are used for the low-temperature, fractured crystalline rock sites in Sweden that are being considered for the geological disposal of spent nuclear fuel. It has been suggested that comparisons between measured and simulated present-day hydrochemical data provide a means to constrain the complex influences of past climatic events and to improve the ability to understand the palaeohydrogeological evolution of the physical system studied. Here the authors demonstrate how the integration of multidisciplinary data and models from one of the sites in Sweden (Forsmark) can aid the appraisal of the hydrochemical conditions at 8000 BC, which is the selected starting point for the palaeohydrogeological modelling of the hydrochemical conditions in the Fennoscandian Shield during the Holocene (last 10 ka). Since a firm understanding of the evolution of the hydrochemical conditions is important for the long-term safety assessment, recognition of the initial hydrochemical conditions is essential for the overall build-up of confidence in the modelling process. |
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