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Groundwater flow modeling of periods with periglacial and glacial climate conditions for the safety assessment of the proposed high-level nuclear waste repository site at Forsmark, Sweden
Swedish Nuclear Fuel and Waste Management Company (SKB), 10124 Stockholm, Box 250, Sweden;Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden.ORCID iD: 0000-0001-9251-5367
2014 (English)In: Hydrogeology Journal, ISSN 14312174, Vol. 22, no 6, p. 1251-1267Article in journal (Refereed) Published
Abstract [en]

The impact of periglacial and glacial climate conditions on groundwater flow in fractured crystalline rock is studied by means of groundwater flow modeling of the Forsmark site, which was recently proposed as a repository site for the disposal of spent high-level nuclear fuel in Sweden. The employed model uses a thermal-hydraulically coupled approach for permafrost modeling and discusses changes in groundwater flow implied by the climate conditions found over northern Europe at different times during the last glacial cycle (Weichselian glaciation). It is concluded that discharge of particles released at repository depth occurs very close to the ice-sheet margin in the absence of permafrost. If permafrost is included, the greater part discharges into taliks in the periglacial area. During a glacial cycle, hydraulic gradients at repository depth reach their maximum values when the ice-sheet margin passes over the site; at this time, also, the interface between fresh and saline waters is distorted the most. The combined effect of advances and retreats during several glaciations has not been studied in the present work; however, the results indicate that hydrochemical conditions at depth in the groundwater flow model are almost restored after a single event of ice-sheet advance and retreat.

Place, publisher, year, edition, pages
Springer Nature , 2014. Vol. 22, no 6, p. 1251-1267
Keywords [en]
Forsmark, Fractured rock, Numerical modeling, Periglacial climate, Sweden
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-330373DOI: 10.1007/s10040-014-1164-7ISI: 000340498900003Scopus ID: 2-s2.0-84906793633OAI: oai:DiVA.org:kth-330373DiVA, id: diva2:1777579
Note

QC 20230630

Available from: 2023-06-29 Created: 2023-06-29 Last updated: 2023-07-31Bibliographically approved

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Publisher's full textScopushttps://doi.org/10.1007%2Fs10040-014-1164-7

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Selroos, Jan-Olof

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CiteExportLink to record
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