Insights about transport mechanisms and fracture flow channeling from multi-scale observations of tracer dispersion in shallow fractured crystalline rock

Abstract : The objective of this study is to investigate the scale dependency of transport phenomena from experiments performed in different flow configurations with varying distances from the injection point. A set of convergent and push-pull tracer experiments was performed at different characteristic distances of investigation ranging from about 4 m to 41 m and for durations ranging from a few hours to more than ten days. Although matrix diffusion is unlikely to be a dominant transport process since crystalline rocks generally display limited matrix porosity (Ohlsson and Neretnieks, 1995), we present push-pull experiments designed to examine this assumption in the present fracture rock setting. All experiments were conducted in a shallow single fracture zone at the Experimental Hydrogeological Park of Choutuppal (Telangana, Southern India) (Guihéneuf et al., 2014; Boisson et al., 2015).
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Journal of Contaminant Hydrology, Elsevier, 2017, 206, pp.18-33. 〈10.1016/j.jconhyd.2017.09.003〉
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Nicolas Guihéneuf, Olivier Bour, Alexandre Boisson, Tanguy Le Borgne, M.W. Becker, et al.. Insights about transport mechanisms and fracture flow channeling from multi-scale observations of tracer dispersion in shallow fractured crystalline rock. Journal of Contaminant Hydrology, Elsevier, 2017, 206, pp.18-33. 〈10.1016/j.jconhyd.2017.09.003〉. 〈insu-01590198〉

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