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Article Dans Une Revue Journal of Contaminant Hydrology Année : 2010

Characterization of fracture void space heterogeneity by electrical impedance measurement

Résumé

The possible characterization of the heterogeneity of the aperture field in rough fractures by electrical impedance measurement is demonstrated through displacement experiments using two miscible fluids of different electrical resistivity. Two model fractures have been used: their complementary rough walls are identical but have different relative shear displacements creating ``channel'' or `barrier'' structures in the void space, respectively parallel or perpendicular to the mean flow velocity $\vec{U}$. In the (``channel'') geometry, the global electrical resistance displays an initial linear variation followed by a ``tail'' part reflecting the contrast between slow and fast flow channels. In the (``barrier'') geometry, the existence of a change in the slope between two linear zones suggests the appearance of domains of different permeabilities along the fracture. These variations are well reproduced theoretically and numerically either by assuming independent flow channels parallel to $\vec{U}$ (channel case) or an aperture that varies only along the flow (barrier case). For each configuration, we present a specific inversion procedure that allows one to extract the key features of the heterogeneity from the resistance variation.
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Dates et versions

hal-00517415 , version 1 (14-09-2010)

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Alejandro Boschan, Irene Ippolito, Ricardo Chertcoff, Jean-Pierre Hulin, Harold Auradou. Characterization of fracture void space heterogeneity by electrical impedance measurement. Journal of Contaminant Hydrology, 2010, 123, pp.65--74. ⟨10.1016/j.jconhyd.2010.12.007⟩. ⟨hal-00517415⟩
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