[Alumnos] HOY Charla Especial: 16 hs: Dr. Damien Jougnot

[Secretaría de Ciencia y Técnica]

Estimados,

Los invitamos hoy a asistir a la siguiente Charla Especial dentro del 
marco de Profesores Visitantes organizado por FCAG, a las 16 hs en el 
Salón Meridiano.

Atentamente,

Secyt - FCAG

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*Charla Especial: Damien Jougnot*

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CNRS, Sorbonne Universités, UPMC Univ Paris 06, UMR 7619 Metis, Paris, 
France


Título: Impact of small-scale saline tracer heterogeneity on electrical 
resistivity monitoring: insight from a geoelectric millifluidic experiment.


Resumen:Time-lapse electrical resistivity tomography is a widely used 
geophysical method to remotely monitor water saturation and the 
migration of contaminant plumes. The effects of heterogeneous solute 
concentrations below the resolution limits of the tomogram are commonly 
ignored. We have adapted an experimental set-up to study the effects of 
sub-resolution solute heterogeneities on the effective bulk electrical 
resistivity. We performed saline tracer tests under full and partial 
water saturations. The unsaturated flow was imposed by jointly injecting 
air and water. The bulk resistivities measured at the scale of the 
medium were confronted to resistivities computed numerically from the 
measured spatial distributions of the fluid phases and the salinity 
field. We find that the air distribution, saline tracer channeling and 
fingering, and mixing phenomena all result in large changes in the 
measured and simulated bulk resistivities by creating preferential flow 
paths or barriers for electric current at the pore scale. Based on these 
findings, we postulate that sub-resolution effects contribute to one of 
the most important inconsistencies in conventional time-lapse ERT 
imaging, namely the apparent loss of tracer mass.

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