Mise en évidence par essais de traçage de la variabilité de la dynamique hydrogéologique du système karstique de la Lomme (Projet KARAG)

Amael Poulain, Gaëtan Rochez (Collaborateur), Vincent Hallet (Promoteur)

Résultats de recherche: Contribution dans un livre/un catalogue/un rapport/dans les actes d'une conférenceArticle dans les actes d'une conférence/un colloque

Résumé

Paleozoic carbonate aquifers represent major
groundwater resources in Belgium. Karstification
processes affect most of them and Belgium counts
many hydrologically active karst networks. Given the
intrinsic vulnerability of such geology, comprehensive
studies are required in order to improve their protection
and management.
The KARAG project (Karst Aquifer ReseArch by
Geophysic, 2013-2017) aims to identify the specific
dynamic of karst aquifers by using geophysical and
hydrogeological tools. This research is funded by the
Belgium National Fund for Scientific Research (FNRS)
and conducted by the University of Namur, University of
Mons and the Royal Observatory of Belgium.
The LKS – Lomme Karst System (Rochefort, southern
Belgium) was chosen as it is a major Belgian karst
system (10 km long) in the Givetian carbonate aquifer
(Middle Devonian). The system is formed by two parallel
components: the surface system (the Lomme River) and
a complex underground system (multiple sinkholes with
one main resurgence). Based on this layout, it is possible
to study the aquifer dynamic and its relationship with the
surface river.
A high resolution monitoring network has been in place
since July 2013 in order to follow the system dynamic
during several hydrogeological cycles.
Multi-tracing experiments with different injections
and monitoring points highlight the complexity
of underground flow dynamics. Investigations
enlightened the connectivity between monitoring
points and how dependent of the hydrological
conditions were these connections. The breakthrough
curves analysis allows to characterize the
hydrodynamic behavior of the underground flows
within the aquifer.
Modeling will be necessary to link hydrological and
tracer tests data in order to build a detailed conceptual
model for this karst system. This model will also be
used to interpret geophysical data (ERT, gravimetry)
collected in order to study the unsaturated and epikarst
zones.
Titre traduit de la contributionMise en évidence par essais de traçage de la variabilité de la dynamique hydrogéologique du système karstique de la Lomme (Projet KARAG)
langueAnglais
titreNCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst
Lieu de publicationCarlsbad
EditeurNational Cave and Karst Research Institute
Nombre de pages7
étatAccepté/sous presse - 2015

mots-clés

  • karst
  • tracer test
  • hydrogeology
  • Rochefort
  • KARAG

Citer ceci

Poulain, A., Rochez, G., & Hallet, V. (Accepted/In press). Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project). Dans NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst Carlsbad: National Cave and Karst Research Institute.
Poulain, Amael ; Rochez, Gaëtan ; Hallet, Vincent. / Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project). NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. Carlsbad : National Cave and Karst Research Institute, 2015.
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title = "Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project)",
abstract = "Paleozoic carbonate aquifers represent major groundwater resources in Belgium. Karstification processes affect most of them and Belgium counts many hydrologically active karst networks. Given the intrinsic vulnerability of such geology, comprehensive studies are required in order to improve their protection and management.The KARAG project (Karst Aquifer ReseArch by Geophysic, 2013-2017) aims to identify the specific dynamic of karst aquifers by using geophysical and hydrogeological tools. This research is funded by the Belgium National Fund for Scientific Research (FNRS) and conducted by the University of Namur, University of Mons and the Royal Observatory of Belgium.The LKS – Lomme Karst System (Rochefort, southern Belgium) was chosen as it is a major Belgian karst system (10 km long) in the Givetian carbonate aquifer (Middle Devonian). The system is formed by two parallel components: the surface system (the Lomme River) and a complex underground system (multiple sinkholes with one main resurgence). Based on this layout, it is possible to study the aquifer dynamic and its relationship with the surface river.A high resolution monitoring network has been in place since July 2013 in order to follow the system dynamic during several hydrogeological cycles.Multi-tracing experiments with different injections and monitoring points highlight the complexity of underground flow dynamics. Investigations enlightened the connectivity between monitoring points and how dependent of the hydrological conditions were these connections. The breakthrough curves analysis allows to characterize the hydrodynamic behavior of the underground flows within the aquifer.Modeling will be necessary to link hydrological and tracer tests data in order to build a detailed conceptual model for this karst system. This model will also be used to interpret geophysical data (ERT, gravimetry) collected in order to study the unsaturated and epikarst zones.",
keywords = "karst, tracer test, hydrogeology, Rochefort, KARAG",
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booktitle = "NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst",
publisher = "National Cave and Karst Research Institute",

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Poulain, A, Rochez, G & Hallet, V 2015, Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project). Dans NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. National Cave and Karst Research Institute, Carlsbad.

Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project). / Poulain, Amael; Rochez, Gaëtan (Collaborateur); Hallet, Vincent (Promoteur).

NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. Carlsbad : National Cave and Karst Research Institute, 2015.

Résultats de recherche: Contribution dans un livre/un catalogue/un rapport/dans les actes d'une conférenceArticle dans les actes d'une conférence/un colloque

TY - GEN

T1 - Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project)

AU - Poulain,Amael

A2 - Rochez,Gaëtan

A2 - Hallet,Vincent

PY - 2015

Y1 - 2015

N2 - Paleozoic carbonate aquifers represent major groundwater resources in Belgium. Karstification processes affect most of them and Belgium counts many hydrologically active karst networks. Given the intrinsic vulnerability of such geology, comprehensive studies are required in order to improve their protection and management.The KARAG project (Karst Aquifer ReseArch by Geophysic, 2013-2017) aims to identify the specific dynamic of karst aquifers by using geophysical and hydrogeological tools. This research is funded by the Belgium National Fund for Scientific Research (FNRS) and conducted by the University of Namur, University of Mons and the Royal Observatory of Belgium.The LKS – Lomme Karst System (Rochefort, southern Belgium) was chosen as it is a major Belgian karst system (10 km long) in the Givetian carbonate aquifer (Middle Devonian). The system is formed by two parallel components: the surface system (the Lomme River) and a complex underground system (multiple sinkholes with one main resurgence). Based on this layout, it is possible to study the aquifer dynamic and its relationship with the surface river.A high resolution monitoring network has been in place since July 2013 in order to follow the system dynamic during several hydrogeological cycles.Multi-tracing experiments with different injections and monitoring points highlight the complexity of underground flow dynamics. Investigations enlightened the connectivity between monitoring points and how dependent of the hydrological conditions were these connections. The breakthrough curves analysis allows to characterize the hydrodynamic behavior of the underground flows within the aquifer.Modeling will be necessary to link hydrological and tracer tests data in order to build a detailed conceptual model for this karst system. This model will also be used to interpret geophysical data (ERT, gravimetry) collected in order to study the unsaturated and epikarst zones.

AB - Paleozoic carbonate aquifers represent major groundwater resources in Belgium. Karstification processes affect most of them and Belgium counts many hydrologically active karst networks. Given the intrinsic vulnerability of such geology, comprehensive studies are required in order to improve their protection and management.The KARAG project (Karst Aquifer ReseArch by Geophysic, 2013-2017) aims to identify the specific dynamic of karst aquifers by using geophysical and hydrogeological tools. This research is funded by the Belgium National Fund for Scientific Research (FNRS) and conducted by the University of Namur, University of Mons and the Royal Observatory of Belgium.The LKS – Lomme Karst System (Rochefort, southern Belgium) was chosen as it is a major Belgian karst system (10 km long) in the Givetian carbonate aquifer (Middle Devonian). The system is formed by two parallel components: the surface system (the Lomme River) and a complex underground system (multiple sinkholes with one main resurgence). Based on this layout, it is possible to study the aquifer dynamic and its relationship with the surface river.A high resolution monitoring network has been in place since July 2013 in order to follow the system dynamic during several hydrogeological cycles.Multi-tracing experiments with different injections and monitoring points highlight the complexity of underground flow dynamics. Investigations enlightened the connectivity between monitoring points and how dependent of the hydrological conditions were these connections. The breakthrough curves analysis allows to characterize the hydrodynamic behavior of the underground flows within the aquifer.Modeling will be necessary to link hydrological and tracer tests data in order to build a detailed conceptual model for this karst system. This model will also be used to interpret geophysical data (ERT, gravimetry) collected in order to study the unsaturated and epikarst zones.

KW - karst

KW - tracer test

KW - hydrogeology

KW - Rochefort

KW - KARAG

M3 - Conference contribution

BT - NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst

PB - National Cave and Karst Research Institute

CY - Carlsbad

ER -

Poulain A, Rochez G, Hallet V. Hydrogeological dynamic variability in the Lomme Karst System (Belgium) as evidenced by tracer tests results (KARAG Project). Dans NCKRI Symposium 5 : Proceedings of the Fourteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. Carlsbad: National Cave and Karst Research Institute. 2015.