Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System
On the edge of sedimentary basins, karst aquifers can be fed by several water sources from both autogenic and allogenic recharge. In some cases, assessing water origins can be hard and cause some difficulties for water resource management. The main goal of this study is to show the implementation of...
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MDPI AG
2023-01-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/3/397 |
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| author | David Viennet Guillaume Lorette David Labat Matthieu Fournier Mathieu Sebilo Olivier Araspin Pierre Crançon |
| author_facet | David Viennet Guillaume Lorette David Labat Matthieu Fournier Mathieu Sebilo Olivier Araspin Pierre Crançon |
| author_sort | David Viennet |
| collection | DOAJ |
| description | On the edge of sedimentary basins, karst aquifers can be fed by several water sources from both autogenic and allogenic recharge. In some cases, assessing water origins can be hard and cause some difficulties for water resource management. The main goal of this study is to show the implementation of the mobile sources mixing model approach. More precisely, this research develops how a monitoring method using a multi-proxy approach can be used to quantify waters sources contributions from several origins at the outlets of a karst system. The study site is the Ouysse karst system, located in western France. The site offers the opportunity to understand the mixing processes between allogenic and autogenic water recharges. The karst system covers a 650 km² watershed, and is fed by three different chemical facies: (i) Autogenic water from the direct infiltration on the karstified limestones with high HCO<sub>3</sub><sup>−</sup> values (median: 436 mg.L<sup>−1</sup>); (ii) Water coming from sinking rivers fed by spring coming from igneous rocks with low mineralization but relatively higher K<sup>+</sup> values (median: 4.2 mg.L<sup>−1</sup>); (iii) Highly mineralized water coming from deep evaporitic layers and feeding another sinking river with very high sulfate concentrations (median: 400 mg.L<sup>−1</sup>). Sliding window cross-correlation analyses and hydrochemical analyses during a flood event are performed to implement a mobile source mixing model approach. This approach shows significant differences with a simple fixed source mixing model and appears more reliable but requires more time and money to carry out. The results and conclusion of this study will be used for forecasting and managing operational actions for resource management. |
| first_indexed | 2024-03-11T09:20:30Z |
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| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T09:20:30Z |
| publishDate | 2023-01-01 |
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| series | Water |
| spelling | doaj.art-c9db2b7658c04b018d01f32852ac7df62023-11-16T18:22:03ZengMDPI AGWater2073-44412023-01-0115339710.3390/w15030397Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst SystemDavid Viennet0Guillaume Lorette1David Labat2Matthieu Fournier3Mathieu Sebilo4Olivier Araspin5Pierre Crançon6Causses du Quercy UNESCO Global Geopark, Labastide-Murat, 46240 Cœur de Causse, FranceCausses du Quercy UNESCO Global Geopark, Labastide-Murat, 46240 Cœur de Causse, FranceGéosciences Environnement, University of Toulouse Toulouse, CNRS UPS IRD CNES, 31400 Toulouse, FranceContinental and Coastal Morphodynamics Laboratory Normandie University, UNIROUEN, UNICAEN, CNRS M2C, 76000 Rouen, FranceInstitute of Ecology and Environmental Sciences–Paris, Sorbonne Université, CNRS, INRAE, IRD, UPD, UPEC, IEES, 75005 Paris, FranceCEA, DAM, DIF, F-91297 Arpajon, FranceCEA, DAM, DIF, F-91297 Arpajon, FranceOn the edge of sedimentary basins, karst aquifers can be fed by several water sources from both autogenic and allogenic recharge. In some cases, assessing water origins can be hard and cause some difficulties for water resource management. The main goal of this study is to show the implementation of the mobile sources mixing model approach. More precisely, this research develops how a monitoring method using a multi-proxy approach can be used to quantify waters sources contributions from several origins at the outlets of a karst system. The study site is the Ouysse karst system, located in western France. The site offers the opportunity to understand the mixing processes between allogenic and autogenic water recharges. The karst system covers a 650 km² watershed, and is fed by three different chemical facies: (i) Autogenic water from the direct infiltration on the karstified limestones with high HCO<sub>3</sub><sup>−</sup> values (median: 436 mg.L<sup>−1</sup>); (ii) Water coming from sinking rivers fed by spring coming from igneous rocks with low mineralization but relatively higher K<sup>+</sup> values (median: 4.2 mg.L<sup>−1</sup>); (iii) Highly mineralized water coming from deep evaporitic layers and feeding another sinking river with very high sulfate concentrations (median: 400 mg.L<sup>−1</sup>). Sliding window cross-correlation analyses and hydrochemical analyses during a flood event are performed to implement a mobile source mixing model approach. This approach shows significant differences with a simple fixed source mixing model and appears more reliable but requires more time and money to carry out. The results and conclusion of this study will be used for forecasting and managing operational actions for resource management.https://www.mdpi.com/2073-4441/15/3/397karst aquiferhydrochemistryhydrodynamichydrogeologysource mixing modelcross correlation |
| spellingShingle | David Viennet Guillaume Lorette David Labat Matthieu Fournier Mathieu Sebilo Olivier Araspin Pierre Crançon Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System Water karst aquifer hydrochemistry hydrodynamic hydrogeology source mixing model cross correlation |
| title | Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System |
| title_full | Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System |
| title_fullStr | Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System |
| title_full_unstemmed | Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System |
| title_short | Mobile Sources Mixing Model Implementation for a Better Quantification of Hydrochemical Origins in Allogenic Karst Outlets: Application on the Ouysse Karst System |
| title_sort | mobile sources mixing model implementation for a better quantification of hydrochemical origins in allogenic karst outlets application on the ouysse karst system |
| topic | karst aquifer hydrochemistry hydrodynamic hydrogeology source mixing model cross correlation |
| url | https://www.mdpi.com/2073-4441/15/3/397 |
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