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Recharge processes and vertical transfer investigated through long-term monitoring of dissolved gases in shallow groundwater.

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Title: Recharge processes and vertical transfer investigated through long-term monitoring of dissolved gases in shallow groundwater.
Authors: de Montety, V.1 veronique.de-montety@univ-montp2.fr, Aquilina, L.2, Labasque, T.2, Chatton, E.2, Fovet, O.3, Ruiz, L.3, Fourré, E.4, de Dreuzy, J.R.2
Source: Journal of Hydrology. May2018, Vol. 560, p275-288. 14p.
Subjects: Groundwater pollution, Noble gases, Seasonal temperature variations, Groundwater recharge, Aquifers, Watersheds, Hydrologic cycle
Abstract: We investigated temporal variations and vertical evolution of dissolved gaseous tracers (CFC-11, CFC-12, SF 6 , and noble gases), as well as 3 H/ 3 He ratio to determine groundwater recharge processes of a shallow unconfined, hard-rock aquifer in an agricultural catchment. We sampled dissolved gas concentration at 4 locations along the hillslope of a small experimental watershed, over 6 hydrological years, between 2 and 6 times per years, for a total of 20 field campaigns. We collected groundwater samples in the fluctuation zone and the permanently saturated zone using piezometers from 5 to 20 m deep. The purpose of this work is i ) to assess the benefits of using gaseous tracers like CFCs and SF6 to study very young groundwater with flows suspected to be heterogeneous and variable in time, ii ) to characterize the processes that control dissolved gas concentrations in groundwater during the recharge of the aquifer, and iii ) to understand the evolution of recharge flow processes by repeated measurement campaigns, taking advantage of a long monitoring in a site devoted to recharge processes investigation. Gas tracer profiles are compared at different location of the catchment and for different hydrologic conditions. In addition, we compare results from CFCs and 3 H/ 3 He analysis to define the flow model that best explains tracer concentrations. Then we discuss the influence of recharge events on tracer concentrations and residence time and propose a temporal evolution of residence times for the unsaturated zone and the permanently saturated zone. These results are used to gain a better understanding of the conceptual model of the catchment and flow processes especially during recharge events. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 128944434
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Recharge processes and vertical transfer investigated through long-term monitoring of dissolved gases in shallow groundwater.
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  Data: <searchLink fieldCode="AR" term="%22de+Montety%2C+V%2E%22">de Montety, V.</searchLink><relatesTo>1</relatesTo><i> veronique.de-montety@univ-montp2.fr</i><br /><searchLink fieldCode="AR" term="%22Aquilina%2C+L%2E%22">Aquilina, L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Labasque%2C+T%2E%22">Labasque, T.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Chatton%2C+E%2E%22">Chatton, E.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fovet%2C+O%2E%22">Fovet, O.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ruiz%2C+L%2E%22">Ruiz, L.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Fourré%2C+E%2E%22">Fourré, E.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22de+Dreuzy%2C+J%2ER%2E%22">de Dreuzy, J.R.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Hydrology%22">Journal of Hydrology</searchLink>. May2018, Vol. 560, p275-288. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Groundwater+pollution%22">Groundwater pollution</searchLink><br /><searchLink fieldCode="DE" term="%22Noble+gases%22">Noble gases</searchLink><br /><searchLink fieldCode="DE" term="%22Seasonal+temperature+variations%22">Seasonal temperature variations</searchLink><br /><searchLink fieldCode="DE" term="%22Groundwater+recharge%22">Groundwater recharge</searchLink><br /><searchLink fieldCode="DE" term="%22Aquifers%22">Aquifers</searchLink><br /><searchLink fieldCode="DE" term="%22Watersheds%22">Watersheds</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrologic+cycle%22">Hydrologic cycle</searchLink>
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  Label: Abstract
  Group: Ab
  Data: We investigated temporal variations and vertical evolution of dissolved gaseous tracers (CFC-11, CFC-12, SF 6 , and noble gases), as well as 3 H/ 3 He ratio to determine groundwater recharge processes of a shallow unconfined, hard-rock aquifer in an agricultural catchment. We sampled dissolved gas concentration at 4 locations along the hillslope of a small experimental watershed, over 6 hydrological years, between 2 and 6 times per years, for a total of 20 field campaigns. We collected groundwater samples in the fluctuation zone and the permanently saturated zone using piezometers from 5 to 20 m deep. The purpose of this work is i ) to assess the benefits of using gaseous tracers like CFCs and SF6 to study very young groundwater with flows suspected to be heterogeneous and variable in time, ii ) to characterize the processes that control dissolved gas concentrations in groundwater during the recharge of the aquifer, and iii ) to understand the evolution of recharge flow processes by repeated measurement campaigns, taking advantage of a long monitoring in a site devoted to recharge processes investigation. Gas tracer profiles are compared at different location of the catchment and for different hydrologic conditions. In addition, we compare results from CFCs and 3 H/ 3 He analysis to define the flow model that best explains tracer concentrations. Then we discuss the influence of recharge events on tracer concentrations and residence time and propose a temporal evolution of residence times for the unsaturated zone and the permanently saturated zone. These results are used to gain a better understanding of the conceptual model of the catchment and flow processes especially during recharge events. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jhydrol.2018.02.077
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 275
    Subjects:
      – SubjectFull: Groundwater pollution
        Type: general
      – SubjectFull: Noble gases
        Type: general
      – SubjectFull: Seasonal temperature variations
        Type: general
      – SubjectFull: Groundwater recharge
        Type: general
      – SubjectFull: Aquifers
        Type: general
      – SubjectFull: Watersheds
        Type: general
      – SubjectFull: Hydrologic cycle
        Type: general
    Titles:
      – TitleFull: Recharge processes and vertical transfer investigated through long-term monitoring of dissolved gases in shallow groundwater.
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            – D: 01
              M: 05
              Text: May2018
              Type: published
              Y: 2018
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              Value: 560
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