Article (Scientific journals)
Monitoring transient groundwater fluxes using the Finite Volume Point Dilution Method
Jamin, Pierre; Brouyère, Serge
2018In Journal of Contaminant Hydrology, 218
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Keywords :
Finite Volume Point Dilution Method; Transient groundwater flux; Single-well tracer test
Abstract :
[en] Classic estimates of groundwater fluxes are usually based on the application of Darcy's law, which can lead to large imprecisions in transient groundwater flow cases. There is a need for direct, in situ measurement techniques able to monitor time-variable groundwater fluxes. The investigation presented here demonstrates that the Finite Volume Point Dilution Method (FVPDM) is a promising technique for the continuous monitoring of groundwater fluxes. The experimental configuration consisted of monitoring transient groundwater fluxes generated by a multiple step pumping test, which was undertaken in the alluvial aquifer of the River Meuse, Liège (Belgium). Additionally, two FVPDM tests were simultaneously performed in two piezometers screened at two different depths in the alluvial aquifer. Tracer concentration changes during the FVPDM tests were interpreted as the consequences of Darcy flux changes in the alluvial aquifer, which was related to changes in the applied pumping rate. Piezometric levels were also monitored in piezometers located around the pumping well. The pumping test was interpreted using classical analytical solutions, and the FVPDM tests were interpreted using a new mathematical solution, which allows for calculating changes in Darcy fluxes based on the FVPDM tracer concentration evolution during transient groundwater flow conditions. The experiment demonstrated the FVPDM's ability to monitor, as well as be sensitive to changes in transient groundwater fluxes. The FVPDM interpretation also showed contrasting results between the upper part of the aquifer, which is made of loam and sand and slow groundwater flows prevail, and the lower part of the aquifer, which is made of gravels and pebbles and intense groundwater flows prevail.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Earth sciences & physical geography
Geological, petroleum & mining engineering
Author, co-author :
Jamin, Pierre ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Brouyère, Serge  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Monitoring transient groundwater fluxes using the Finite Volume Point Dilution Method
Publication date :
November 2018
Journal title :
Journal of Contaminant Hydrology
ISSN :
0169-7722
Publisher :
Elsevier, Netherlands
Special issue title :
Groundwater Quality 2015 Special Issue
Volume :
218
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ULiège - Université de Liège [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FRB - Fondation Roi Baudouin [BE]
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since 25 September 2018

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