Speaker
Description
The aim here is to study multiphasic flow in the vadose zone, consisting of saturated, unsaturated, mobile and immobile regions. This medium plays a critical role in transporting water from the surface to underground reservoirs [1]. However, water safety is threatened by climate change and human activities [2] [3] with poor remediation solutions. This observation reinforces the need for further studies of such media [4]. Thus, an accurate understanding of the interplay between reactivity and transport at micro and macro (Darcy) scales is required. This is done in order to predict
the fate of contaminants in natural aquifers and improve remediation solutions.
Traditionally, a macroscale description of reactive transport [5] is used. but recent studies show that there are heterogeneities at the microscale of transport for conservative and reactive solutes [6]. The understanding of these phenomena for air-water adsorption in unsaturated media still lacks experimental data that can be further used to support models and simulations [7]. Along this path, several experimental tools will be combined, such as dynamic breakthrough experiments. These (experiments) provide averaged information over the porous media, with X-ray microtomography. These high-precision techniques will improve our understanding the fate of contaminants and shed light on the vadose zone for improved remediation solutions.
| References | [1] H. Vereecken, J. A. Huisman, H. Bogena, J. Vanderborght, J. A. Vrugt, et J. W. Hopmans, « On the value of soil moisture measurements in vadose zone hydrology: A review », Water Resour. Res., vol. 44, no 4, 2008, doi: 10.1029/2008WR006829. [2] A. Nissan et al., « Global warming accelerates soil heterotrophic respiration », Nat. Commun., vol. 14, no 1, p. 3452, juin 2023, doi: 10.1038/s41467-023-38981-w. [3] « UnescoPhysicalDocument ». Consulté le: 14 avril 2025. [En ligne]. Disponible sur: https://unesdoc.unesco.org/ark:/48223/pf0000247153 [4] H. Meuser, Soil Remediation and Rehabilitation, vol. 23. 2013. doi: 10.1007/978-94-007-5751-6. [5] A. E. Scheidegger, « General theory of dispersion in porous media », J. Geophys. Res., vol. 66, no 10, p. 3273‑3278, oct. 1961, doi: 10.1029/JZ066i010p03273. [6] T. Aquino, T. Le Borgne, et J. Heyman, « Fluid–Solid Reaction in Porous Media as a Chaotic Restart Process », Phys. Rev. Lett., vol. 130, no 26, p. 264001, juin 2023, doi: 10.1103/PhysRevLett.130.264001. [7] I. Markale, A. Velásquez-Parra, A. Alcolea, et J. Jimenez-Martinez, « Mixing Controlled Adsorption at the Liquid-Solid Interfaces in Unsaturated Porous Media », Transp. Porous Media, vol. 146, no 1‑2, p. 159‑175, janv. 2023, doi: 10.1007/s11242-022-01747-x. |
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| Country | France |
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