Inferring transport characteristics in a fractured rock aquifer by combining single-hole ground-penetrating radar reflection monitoring and tracer test data

Détails

ID Serval
serval:BIB_88D5A3B19083
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Inferring transport characteristics in a fractured rock aquifer by combining single-hole ground-penetrating radar reflection monitoring and tracer test data
Périodique
Water Resources Research
Auteur⸱e⸱s
Dorn C., Linde N., Le Borgne T., Bour O., Klepikova M.
ISSN
0043-1397
ISSN-L
0043-1397
Statut éditorial
Publié
Date de publication
2012
Volume
48
Pages
W11521
Langue
anglais
Notes
ISI:000311216600001
Résumé
Investigations of solute transport in fractured rock aquifers often rely
on tracer test data acquired at a limited number of observation points.
Such data do not, by themselves, allow detailed assessments of the
spreading of the injected tracer plume. To better understand the
transport behavior in a granitic aquifer, we combine tracer test data
with single-hole ground-penetrating radar (GPR) reflection monitoring
data. Five successful tracer tests were performed under various
experimental conditions between two boreholes 6 m apart. For each
experiment, saline tracer was injected into a previously identified
packed-off transmissive fracture while repeatedly acquiring single-hole
GPR reflection profiles together with electrical conductivity logs in
the pumping borehole. By analyzing depth-migrated GPR difference images
together with tracer breakthrough curves and associated simplified flow
and transport modeling, we estimate (1) the number, the connectivity,
and the geometry of fractures that contribute to tracer transport, (2)
the velocity and the mass of tracer that was carried along each flow
path, and (3) the effective transport parameters of the identified flow
paths. We find a qualitative agreement when comparing the time evolution
of GPR reflectivity strengths at strategic locations in the formation
with those arising from simulated transport. The discrepancies are on
the same order as those between observed and simulated breakthrough
curves at the outflow locations. The rather subtle and repeatable GPR
signals provide useful and complementary information to tracer test data
acquired at the outflow locations and may help us to characterize
transport phenomena in fractured rock aquifers.
Open Access
Oui
Création de la notice
21/12/2012 15:29
Dernière modification de la notice
20/08/2019 14:47
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