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Heat tracer and solute tests in an alluvial aquifer: field experiment and inverse modelling
Dassargues, Alain; Klepikova, Maria; Jamin, Pierre et al.
2015AGU Fall Meeting Session H51F paper 1438
 

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Keywords :
shallow geothermy; groundwater; tracer test; heat injection; inverse modelling; heat transport
Abstract :
[en] Using heat as an active tracer in different types of aquifers is a topic of increasing interest. In this study, we investigate the potential interest of using heat tracer tests for characterization of a shallow alluvial aquifer. A thermal tracer test was conducted in the alluvial aquifer of the Meuse River, Belgium. The tracing experiment consisted in simultaneously injecting heated water and a dye tracer in a piezometer and monitoring the evolution of groundwater temperature and tracer concentration in the recovery well and in monitoring wells. To get insights in the 3D characteristics of the heat transport mechanisms the space-filling arrangement of observation wells was used. The breakthrough curves measured in the recovery well showed that heat transfer in the alluvial aquifer is slower and more dispersive than solute transport. Recovery is very low for heat while in the same time it is measured as relatively high for the solute tracer. This is due to the fact that heat diffusion is larger than molecular diffusion, implying that exchange between groundwater and the porous medium matrix is far more significant for heat than for solute tracers. Temperature breakthrough curves in other piezometers are contrasted with what would be expected in an ideal layered aquifer. They reveal strongly unequal lateral and vertical components of the transport mechanisms. The observed complex behavior of the heat plume was explained by the groundwater flow gradient on the site and heterogeneities of hydraulic conductivity field. By using numerical model of heat and flow coupled with pilot points inverse approach main preferential paths were characterized.
Research center :
Aquapôle - ULiège
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Dassargues, Alain  ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Klepikova, Maria;  ETH Zurich > Geological Institute
Jamin, Pierre ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Orban, Philippe  ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Brouyère, Serge  ;  Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Heat tracer and solute tests in an alluvial aquifer: field experiment and inverse modelling
Publication date :
18 December 2015
Event name :
AGU Fall Meeting Session H51F paper 1438
Event organizer :
AGU
Event place :
San Francisco, United States
Event date :
December 14-18 2015
Audience :
International
Funders :
EU-Cofund and ULg
Available on ORBi :
since 08 February 2016

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