H31B-1412
Field signatures of non-Fickian transport processes: transit time distributions, spatial correlations, reversibility and hydrogeophysical imaging

Wednesday, 16 December 2015
Poster Hall (Moscone South)
Tanguy Le Borgne1, Peter K Kang2,3, Nicolas Guihéneuf4, Alexis Shakas5, Olivier Bour6, Niklas Linde5 and Marco Dentz7, (1)University of Rennes, Geosciences Rennes, UMR CNRS 6118, Rennes Cedex, France, (2)Massachusetts Institute of Technology, Cambridge, MA, United States, (3)Korea Institute of Science and Technology, Subsurface Energy and Mechanics Lab, Seoul, South Korea, (4)Géosciences Rennes, Rennes, France, (5)University of Lausanne, Lausanne, Switzerland, (6)University of Rennes, Rennes Cedex, France, (7)IDAEA-CSIC, Barcelona, Spain
Abstract:
Non-Fickian transport phenomena are observed in a wide range of scales across hydrological systems. They are generally manifested by a broad range of transit time distributions, as measured for instance in tracer breakthrough curves. However, similar transit time distributions may be caused by different origins, including broad velocity distributions, flow channeling or diffusive mass transfer [1,2]. The identification of these processes is critical for defining relevant transport models. How can we distinguish the different origins of non-Fickian transport in the field? In this presentation, we will review recent experimental developments to decipher the different causes of anomalous transport, based on tracer tests performed at different scales in cross borehole and push pull conditions, and time lapse hydrogeophysical imaging of tracer motion [3,4].

References:

[1] de Anna-, P., T. Le Borgne, M. Dentz, A. M. Tartakovsky, D. Bolster, P. Davy (2013) Flow Intermittency, Dispersion and Correlated Continuous Time Random Walks in Porous Media, Phys. Rev. Lett., 110, 184502

[2] Le Borgne T., Dentz M., and Carrera J. (2008) Lagrangian Statistical Model for Transport in Highly Heterogeneous Velocity Fields. Phys. Rev. Lett. 101, 090601

[3] Kang, P. K., T. Le Borgne, M. Dentz, O. Bour, and R. Juanes (2015), Impact of velocity correlation and distribution on transport in fractured media : Field evidence and theoretical model, Water Resour. Res., 51, 940–959

[4] Dorn C., Linde N., Le Borgne T., O. Bour and L. Baron (2011) Single-hole GPR reflection imaging of solute transport in a granitic aquifer Geophys. Res. Lett. Vol.38, L08401

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