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Constraining age distributions of groundwater from public supply wells in diverse hydrogeological settings in Scania, Sweden

Åkesson, Maria LU ; Suckow, Axel; Visser, Ate; Sültenfuss, Jürgen; Laier, Troels; Purtschert, Roland and Sparrenbom, Charlotte LU (2015) In Journal of Hydrology 528. p.217-229
Abstract
Twenty-five public supply wells throughout the hydrogeologically diverse region of Scania, Southern Sweden are subjected to environmental tracer analysis (3H–3He, 4He, CFCs, SF6 and for one well only also 85Kr and 39Ar) to study well and aquifer vulnerability and evaluate possibilities of groundwater age distribution assessment. We find CFC and SF6 concentrations well above solubility equilibrium with modern atmosphere, indicating local contamination, as well as indications of CFC degradation. The tracer-specific complications considerably constrain possibilities for sound quantitative regional groundwater age distribution assessments and demonstrate the importance of initial qualitative assessment of tracer-specific reliability, as well a... (More)
Twenty-five public supply wells throughout the hydrogeologically diverse region of Scania, Southern Sweden are subjected to environmental tracer analysis (3H–3He, 4He, CFCs, SF6 and for one well only also 85Kr and 39Ar) to study well and aquifer vulnerability and evaluate possibilities of groundwater age distribution assessment. We find CFC and SF6 concentrations well above solubility equilibrium with modern atmosphere, indicating local contamination, as well as indications of CFC degradation. The tracer-specific complications considerably constrain possibilities for sound quantitative regional groundwater age distribution assessments and demonstrate the importance of initial qualitative assessment of tracer-specific reliability, as well a need for additional, complementary tracers (e.g. 85Kr, 39Ar and potentially also 14C). Lumped parameter modelling yields credible age distribution assessments for representative

wells in four type aquifers. Pollution vulnerability of the aquifer types was based on the selected LPM models and qualitative age characterisation. Most vulnerable are unconfined dual porosity and fractured bedrock aquifers, due to a large component of very young groundwater. Unconfined sedimentary aquifers are vulnerable due to young groundwater and a small pre-modern component. Less vulnerable

are semi-confined sedimentary or dual-porosity aquifers, due to older age of the modern component and a larger pre-modern component. Confined aquifers appear least vulnerable, due an entirely pre-modern

groundwater age distribution (recharged before 1963). Tracer complications aside, environmental tracer analyses and lumped parameter modelling aid in vulnerability assessment and protection of regional groundwater resources. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
lumped parameter modelling, groundwater age, groundwater, environmental tracers, pollution vulnerability, Scania
in
Journal of Hydrology
volume
528
pages
217 - 229
publisher
Elsevier
external identifiers
  • wos:000358968200019
  • scopus:84933532954
ISSN
0022-1694
DOI
10.1016/j.jhydrol.2015.06.022
language
English
LU publication?
yes
id
e57c6f00-e911-4d36-9ca5-d6ce38222f74 (old id 7760418)
date added to LUP
2015-08-21 12:54:55
date last changed
2017-07-02 04:11:09
@article{e57c6f00-e911-4d36-9ca5-d6ce38222f74,
  abstract     = {Twenty-five public supply wells throughout the hydrogeologically diverse region of Scania, Southern Sweden are subjected to environmental tracer analysis (3H–3He, 4He, CFCs, SF6 and for one well only also 85Kr and 39Ar) to study well and aquifer vulnerability and evaluate possibilities of groundwater age distribution assessment. We find CFC and SF6 concentrations well above solubility equilibrium with modern atmosphere, indicating local contamination, as well as indications of CFC degradation. The tracer-specific complications considerably constrain possibilities for sound quantitative regional groundwater age distribution assessments and demonstrate the importance of initial qualitative assessment of tracer-specific reliability, as well a need for additional, complementary tracers (e.g. 85Kr, 39Ar and potentially also 14C). Lumped parameter modelling yields credible age distribution assessments for representative<br/><br>
wells in four type aquifers. Pollution vulnerability of the aquifer types was based on the selected LPM models and qualitative age characterisation. Most vulnerable are unconfined dual porosity and fractured bedrock aquifers, due to a large component of very young groundwater. Unconfined sedimentary aquifers are vulnerable due to young groundwater and a small pre-modern component. Less vulnerable<br/><br>
are semi-confined sedimentary or dual-porosity aquifers, due to older age of the modern component and a larger pre-modern component. Confined aquifers appear least vulnerable, due an entirely pre-modern<br/><br>
groundwater age distribution (recharged before 1963). Tracer complications aside, environmental tracer analyses and lumped parameter modelling aid in vulnerability assessment and protection of regional groundwater resources.},
  author       = {Åkesson, Maria and Suckow, Axel and Visser, Ate and Sültenfuss, Jürgen and Laier, Troels and Purtschert, Roland and Sparrenbom, Charlotte},
  issn         = {0022-1694},
  keyword      = {lumped parameter modelling,groundwater age,groundwater,environmental tracers,pollution vulnerability,Scania},
  language     = {eng},
  pages        = {217--229},
  publisher    = {Elsevier},
  series       = {Journal of Hydrology},
  title        = {Constraining age distributions of groundwater from public supply wells in diverse hydrogeological settings in Scania, Sweden},
  url          = {http://dx.doi.org/10.1016/j.jhydrol.2015.06.022},
  volume       = {528},
  year         = {2015},
}