the dna of o-zns platform, the geophysical objectives...hydrogeology geophysics geology geochemistry...
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Clara Jodry, Thomas Jouen
The DNA of O-ZNS platform,the geophysical objectives
contact: [email protected]
Workshop Knowledge’s frontiers in water unsaturated hydrogeosystems:interface dynamics, heterogeneities & couplings, 27-28 June 2019
(Work done in collaboration with BRGM, IRIS Inst., METIS, UNISTRA, INRA and IRD)
O-ZNS: Scientific program of the observatory development
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Understand mass and heat transfers throughout the continuum
“atmosphere-vegetation-soil-vadoze zone-capillary fringe-saturated zone"
WP 1: Characterization of the host rock
WP 2 : Observatory design and environment disruption
WP 3 : Characterization of the content
WP 4 : Data management
Hydrogeology
Geophysics
Geology MicrobiologyGeochemistry
How to spatialize mass and heat transfers in the vadose zoneof a karstified/factured limestone aquifer?
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Multi methods geophysical measurements:SNMR, ERT, Georadar, Seismic, Microgravimetry
Multiple scales:Surface, boreholes and in-well measurements and monitoring
2 m
8 m
120°
Non polarizable electrode
Temperature sensors
Geophysics
In Situ Measures
(work done in collaboration with BRGM,
IRIS Inst., METIS, UNISTRA)
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Spatialize complementary geophysical measurements under field conditions
In Situ Measures
Highlight different scales and resolution
Multi methods geophysical measurements:ERT, TIP/SIP, SP, Georadar, NMR
Core samples measurements for every facies
Cherubini et al., 2018Watlet et al., 2018
Laboratory experiments
Geophysics
(work done in collaboration with METIS, IFPEN, BRGM)
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Understand origins of geophysical measurements evolution
Petrophysical relationships linking geophysics to bio-physico-chemical properties
Geophysical interpretation
Geology
Hydrogeology
Geochemistry
Microbiology
Spatialize complementary geophysical measurements under field conditions
In Situ Measures
Highlight different scales and resolution
Laboratory experiments
Geophysics
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Geophysics
Current and prospective projects:
i. Convention ISTO/BRGM : State of the mechanical and hydrogeological properties to establish a reference state for the future measurements, Optimal sizing of the well and the additional borehole, Setting up geophysical instrumentations.
ii. Thesis (Sept. 2019, BRGM in collaboration with IRD and ISTO) on the development of joint inversion of SNMR and hydrogeological model for the vadose zone to better consider the scale changes and heterogeneity of hydraulic transfers.
iii. Regional project (submission Dec. 2019, BRGM in collaboration with ISTO) on the coupling of geophysical methods and the problematic of multi-scales to improve the hydrogeological monitoring in the vadose zone
iv. ANR project (submission Oct. 2019, METIS in collaboration with ISTO, BRGM, IFPEN) on the solute mass transport throughout the vadose zone at various scales
v. On going talks with University of Lorraine, University of Strasbourg, INRA, IFSTTAR, IMAGEAU, CEMENTYS, etc.
Main questions: • How to take into account the spatial heterogeneity and temporal variability• How to quantify geophysical measurements in terms of hydrogeological properties• How to switch from one scale to another
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• What resolution can we expect to attainin the field taking on effects of depth,size and contrast ?
• How to assess the temporal drift andviability of the monitoring devices ?
• How to reconcile all incertitude, geophysical and otherwise, linked to each methods of observation ?
• What tool to use to combine multiple data ?• How to link integrative information from surface measurements to small-scale and punctual
information from devices in the well ?
• How to validate and estimate the limitsof a model or petrophysical relationshipestablish in the lab but used in fieldconditions ?
• What theoritical model to use in thecontext of a partially saturated zone andkarstified limestone ?
In Situ Measures Laboratory experiments
Geophysical interpretation
Geophysics
Thanks for your attention !
https://www.plateformes-pivots.eu/
Contacts :
Mohamed Azaroual, [email protected]
Arnaud Isch, [email protected]
Clara Jodry, [email protected]
Site de Villamblain, lieu-dit les Hôtels (45310)
• Before the digging of the observation well: surface, borehole/borehole and well logging measurements
State of the mechanical and hydrogeological properties before digging
Definition of the well location based on this interpretation
• While the digging of the observation well:borehole/borehole measurements
Visualize and monitor the damage zone
State of the mechanical and hydrogeological properties to establish a reference state for the future measurements
Setting up geophysical instrumentations
• After the digging of the observation well: surface, surface/borehole and borehole/borehole measurements
Optimal sizing of the well and the additional borehole
O-ZNS: Geophysical monitoring and plan for the project
Implementing on geophysical research project on identified subject linked to the functioning of carbonate rocks ZNS 9
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O-ZNS: In situ measurements
SP electrode
Soil
Temperature sensor
Marl
NMR sensor
sampling drain
Limestone
TDR & Sampler
Fiber-Optic for
micro movement
Piezometer
Fiber-Optic for water
content
v
v
2 m
8 m
Non polarizable electrode