What can be learnt about dispersivity from transport experiments in unsaturated double-porosity soils?

T.D. Tran Ngoc, Azita Ahmadi, Henri Bertin

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: General Hydrogeology III

ABSTRACT: Dispersivity is assumed to be an intrinsic property which characterizes the heterogeneity scale of porous media. When -local pore size characteristics is observed. In this work, we revisited the intrinsicity of the dispersivity of a double-porosity soil with different saturations, by performing a series of one-dimensional experiments of chloride tracer dispersion under different boundary conditions. The physical double-porosity model was composed of solidified clayey balls, distributed periodically in a more permeable sandy matrix. The dependence of the dispersivity on the saturation in the double-porosity soil was established and compared with the trends obtained for the single-porosity soils in previous studies. R a milieux poreux. Lorsque le milieu est sapar deux phases fluides (eau et air), elle Le concept - lesquels on observe un fort contraste de tailles iques locales de pores. Dans ce travail, nous la , traceur, pour de sable de la saturation dans le sol avec les simple-

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