Amélioration de la détection des racines ligneuses par polarisation provoquée en temps et fréquence: expérimentations du laboratoire au terrain
- Mary, B.
- Abdulsamad, F.
- Saracco, G
- Peyras, L.
- Vennetier, M.
- Mériaux, P.
- Camerlynck, Christian
DOIAbstract
International audienceAims: Over the last decade the induced polarization (IP) method has emerged as a promising tool for subsurface investigation with growing interest for biogeophysics.Methods: In this work, in addition to electrical resistivity methods, IP was tested experimentally as a proxy for identifying and discriminating tree coarse roots from the surrounding soil. This study permitted to show the effect of polarization at low frequencies (<25 Hz) using spectral (SIP) and temporal (TDIP) approaches both in laboratory and in the field.Results: (i) the resistivity of woody roots samples was higher than that of a silty soil; (ii) roots polarized at frequencies lower than that of the soil; (iii) the effects of polarization increased wi...
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