Article (Scientific journals)
Tracer Experiment in a Brownfield Using Geophysics and a Vadose Zone Monitoring System
Fernandez de Vera, Natalia; Beaujean, Jean; Jamin, Pierre et al.
2017In Vadose Zone Journal, 16 (1), p. 1-15
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Keywords :
electrical resistivity tomography; flexible time domain reflectometry; Vadose zone monitoring system; vadose zone sampling
Abstract :
[en] A saline tracer infiltration test across the fractured vadose zone of an industrial contaminated site in Belgium was monitored by combining surface and cross-borehole electrical resistivity tomography (ERT) methods with a vadose zone monitoring system (VMS). The VMS provides in situ continuous hydraulic and chemical information on the percolating tracer at multiple depths in the vadose zone. The combination of such high-resolution data with time-lapse geophysical images that capture the spatiotemporal variability of the subsurface improves interpretations of flow and transport, providing a better characterization of infiltration mechanisms and preferential flow paths. The tracer infiltration test was performed over a heterogeneous vadose zone composed of backfilled materials, sands and silts, and unsaturated fractured chalk. Monitoring results during a 5-d period revealed the formation of a tracer plume in the upper backfilled deposits, while some of the tracer migrated laterally following preferential pathways. Slow vertical flow through matrix pores was found to be dominant under dry conditions. Infiltration of small quantities of rain during the test was found to have an influence on the spatial distribution of the plume. Results from long-term monitoring revealed vertical transport of the tracer toward depths that reached 4 m during a time period of 105 d. During that period, fracture and matrix flow mechanisms across the vadose zone were activated as a response to frequent rainfall episodes. The study demonstrates that the interpretation of geophysical images is improved by in situ information from the VMS.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Earth sciences & physical geography
Geological, petroleum & mining engineering
Author, co-author :
Fernandez de Vera, Natalia ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'Environnement
Beaujean, Jean;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Jamin, Pierre ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Hakoun, Vivien;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'Environnement
Caterina, David  ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Dahan, Ofer;  Ben Gurion University of the Negev > Department of Hydrology and Microbiology > Zuckerberg Institute for Water Research
Vanclooster, Marnik
Dassargues, Alain  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Nguyen, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Brouyère, Serge  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Tracer Experiment in a Brownfield Using Geophysics and a Vadose Zone Monitoring System
Publication date :
01 January 2017
Journal title :
Vadose Zone Journal
ISSN :
1539-1663
Publisher :
Soil Science Society of America, United States
Volume :
16
Issue :
1
Pages :
1-15
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 265063 - ADVOCATE - Advancing Sustainable In Situ Remediation for Contaminated Land and Groundwater
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation [BE]
CE - Commission Européenne [BE]
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since 17 April 2018

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