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Modelling pesticide transport in a shallow groundwater catchment using tritium and helium-3 data

Åkesson, Maria LU ; Bendz, David; Carlsson, Christel; Sparrenbom, Charlotte LU and Kreuger, Jenny (2014) In Applied Geochemistry 50. p.231-239
Abstract
Using tritium and helium-3 data for calibration, a 2-D transport model was set up to explain the occurrence of bentazone, dichlorprop, glyphosate, isoproturon, MCPA and metamitron in a small groundwater catchment in southern Sweden. The model was parameterised with site-specific degradation and sorption data to enable transport simulations. Local climatological data and a 21-year record of agricultural pesticide use within the study area were used as boundary conditions. Model output was evaluated against a 7-year long pesticide monitoring data-series from two monitoring wells within the study area. The model successfully predicts observed breakthrough of bentazone, dichlorprop, isoproturon and MCPA. However, it fails to simulate observed... (More)
Using tritium and helium-3 data for calibration, a 2-D transport model was set up to explain the occurrence of bentazone, dichlorprop, glyphosate, isoproturon, MCPA and metamitron in a small groundwater catchment in southern Sweden. The model was parameterised with site-specific degradation and sorption data to enable transport simulations. Local climatological data and a 21-year record of agricultural pesticide use within the study area were used as boundary conditions. Model output was evaluated against a 7-year long pesticide monitoring data-series from two monitoring wells within the study area. The model successfully predicts observed breakthrough of bentazone, dichlorprop, isoproturon and MCPA. However, it fails to simulate observed occurrences of glyphosate and metamitron. Glyphosate and metamitron exhibit relatively high sorption potential, and their occurrence is suggested to be the result of non-equilibrium preferential flow paths which the model cannot reproduce due the conceptualisation of the system as homogenous and isotropic. The results indicate a promising methodological approach applicable to groundwater contamination risk assessment, and demonstrate the potential for transport model calibration by means of tritium and helium-3 data. Main constraints of the study relate to the relatively simple system conceptualisation, indicating a need for further consideration of physical and chemical heterogeneity. (C) 2014 Elsevier Ltd. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Applied Geochemistry
volume
50
pages
231 - 239
publisher
Elsevier
external identifiers
  • wos:000344948100022
  • scopus:84910096126
ISSN
0883-2927
DOI
10.1016/j.apgeochem.2014.01.007
language
English
LU publication?
yes
id
dd9183b2-478c-4638-90ab-bb5a6e67c883 (old id 4984553)
date added to LUP
2015-01-27 09:18:00
date last changed
2017-08-27 03:17:11
@article{dd9183b2-478c-4638-90ab-bb5a6e67c883,
  abstract     = {Using tritium and helium-3 data for calibration, a 2-D transport model was set up to explain the occurrence of bentazone, dichlorprop, glyphosate, isoproturon, MCPA and metamitron in a small groundwater catchment in southern Sweden. The model was parameterised with site-specific degradation and sorption data to enable transport simulations. Local climatological data and a 21-year record of agricultural pesticide use within the study area were used as boundary conditions. Model output was evaluated against a 7-year long pesticide monitoring data-series from two monitoring wells within the study area. The model successfully predicts observed breakthrough of bentazone, dichlorprop, isoproturon and MCPA. However, it fails to simulate observed occurrences of glyphosate and metamitron. Glyphosate and metamitron exhibit relatively high sorption potential, and their occurrence is suggested to be the result of non-equilibrium preferential flow paths which the model cannot reproduce due the conceptualisation of the system as homogenous and isotropic. The results indicate a promising methodological approach applicable to groundwater contamination risk assessment, and demonstrate the potential for transport model calibration by means of tritium and helium-3 data. Main constraints of the study relate to the relatively simple system conceptualisation, indicating a need for further consideration of physical and chemical heterogeneity. (C) 2014 Elsevier Ltd. All rights reserved.},
  author       = {Åkesson, Maria and Bendz, David and Carlsson, Christel and Sparrenbom, Charlotte and Kreuger, Jenny},
  issn         = {0883-2927},
  language     = {eng},
  pages        = {231--239},
  publisher    = {Elsevier},
  series       = {Applied Geochemistry},
  title        = {Modelling pesticide transport in a shallow groundwater catchment using tritium and helium-3 data},
  url          = {http://dx.doi.org/10.1016/j.apgeochem.2014.01.007},
  volume       = {50},
  year         = {2014},
}