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On the use of geoelectrical methods in biogeophysics

Presenting person: Dr. André Revil, Université Savoie Mont-Blanc ISTERRE CNRS, France (Homepage)
Th. 2017-06-22 (12:00-13:30), H6, GEO

Biogeophysics is the science of looking at (micro)biological effects non-intrusively using geophysical techniques. This is a recently developed field with a large number of applications. In this talk, I will introduce the concepts of biogeophysics and show what methods can be used to provide a good sensitivity to biological activity in the subsurface of the Earth. I will especially focus on two methods, one active called induced polarization, and one passive called self-potential. I will discuss how Monod kinetics parameters can be assessed non-intrusively using time-lapse induced polarization and I will introduce the concept of biogeobattery. Bacteria and biofilms can wire the ground and generate electromagnetic disturbances that can be measured remotely. I will also show how time-lapse resistivity monitoring can be applied to water uptake from roots and to monitor sap activity in trees.

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Invited by Sven Frei, Hydrology



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