Impact of repository depth on residence times for leaking radionuclides in land-based surface water
2007 (English)In: Acta Geophysica, ISSN 1895-6572, Vol. 55, no 1, 73-84 p.Article in journal (Refereed) Published
The multiple scales of landscape topography produce a wide distribution of groundwater circulation cells that control the hydro- geological environments surrounding geological repositories for nuclear waste. The largest circulation cells tend to discharge water into major river reaches, large freshwater systems or the nearby Baltic Sea. We investigated numerically the release of radionuclides from repositories placed in bedrock with depths between 100 to 2000 meters in a Swedish coastal area and found that leakage from the deeper positions emerges primarily in the major aquatic systems. In effect, radionuclides from the deeper repositories are more rapidly transported towards the Sea by the stream system compared to leakage from more shallow repositories. The release from the shallower repositories is significantly retained in the initial stage of the transport in the ( superficial) landscape because the discharge occurs in or near low- order streams with high retention characteristics. This retention and residence time for radioactivity in the landscape control radiological doses to biota and can, thus, be expected to constitute an essential part of an associated risk evaluation.
Place, publisher, year, edition, pages
2007. Vol. 55, no 1, 73-84 p.
hydrology, radio nuclide migration, surface water-groundwater interaction, transient storage, transport, stream
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-17076DOI: 10.2478/s11600-006-0040-9ISI: 000250520400009OAI: oai:DiVA.org:kth-17076DiVA: diva2:335119
QC 20100525 201202242010-08-052010-08-052012-02-24Bibliographically approved