Unpublished conference/Abstract (Scientific congresses and symposiums)
What is impacting transboundary aquifers? Climate or global changes?
Brouyère, Serge; Goderniaux, Pascal; Glaude, Robin et al.
2021IAH2021
 

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Keywords :
transboundary aquifer; climate change; groundwater level decrease
Abstract :
[en] In Eastern Belgium, one of the main groundwater reservoirs is located in Cretaceous chalk geological formations. The recharge zone of this aquifer corresponds to the Hesbaye chalk aquifer of the Geer basin, in the Walloon region of Belgium (Groundwater body BERWM040). In Flanders, the chalk layer deepens to the North-West where it becomes confined under Tertiary sediments (Groundwater body BLKS_1100_GWL_1M). Groundwater from this chalk aquifer has been exploited for decades by different water companies, through pumping wells and galleries. These last decades, groundwater level time series have started to exhibit decreases, particularly in the recharge zone, when comparing the 1960-1990 and 1990-2020 periods. These decreases have been mostly attributed to first signals of climate change, with observed temperature increase and precipitation decrease, inducing a decrease of recharge. However, hydrogeological budgets calculated over different time periods for the Walloon part of the catchment have indicated increased water losses, attributed to a probable increase of groundwater abstraction in the Flemish part of the aquifer. All these results are reanalysed here in terms of water budget, evolution of groundwater levels and changes in indicators reflecting the pressure of groundwater abstraction on the evolution of groundwater reserves. Conclusions show that climate change is indeed a driver but increased anthropogenic pressure is also likely to be a key controlling factor. Based on this analysis, conclusions are drawn in terms of the need for efficient integrated transboundary management of such very important groundwater resources in a context of global change.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Brouyère, Serge  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Goderniaux, Pascal;  Université de Mons - UMONS > Polytech Mons > Géologie fondamentale et appliquée
Glaude, Robin  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Orban, Philippe  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Compère, Jean-Michel;  CILE (Compagnie Intercommunale des Eaux)
Language :
English
Title :
What is impacting transboundary aquifers? Climate or global changes?
Alternative titles :
[en] Qu'est-ce qui impacte les aquifères transfrontaliers? Le dérèglement climatique ou les changements globaux?
Publication date :
09 September 2021
Event name :
IAH2021
Event organizer :
IAH Belgium (The International Association of Hydrogeologists)
Event place :
Bruxelles, Belgium
Event date :
du 6 septembre 2021 au 10 septembre 2021
By request :
Yes
Audience :
International
Available on ORBi :
since 15 September 2021

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