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Modelling diffusion in a heterogeneous rock matrix with a time-domain Lagrangian method and an inversion procedureModélisation de la diffusion dans une matrice rocheuse hétérogène par une méthode lagrangienne dans le domaine des temps et une procédure d'inversion |
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| Authors: | Frédérick Delay Gilles Porel Paul Sardini |
| Institution: | Université de Poitiers, bâtiment des sciences de la Terre, 40, av. du Recteur-Pineau, 86022 Poitiers cedex, France |
| Abstract: | A Lagrangian method in time domain is proposed to solve transport by diffusion over large grids such as those extracted from autoradiographs of rock samples. The method is rapid and well suited to simulate out-diffusion experiments in a heterogeneous rock matrix. By coupling with a Gauss–Newton optimiser, it is possible to identify automatically the diffusion coefficients of porous areas in the matrix. This offers a more comprehensive view of a potential transport of contaminants, e.g., after a leak from an underground repository site. To cite this article: F. Delay et al., C. R. Geoscience 334 (2002) 967–973. |
| Keywords: | Lagrangian diffusion out-diffusion autoradiography inverse problem diffusion lagrangienne rétro-diffusion autoradiographie problème inverse Géosciences de surface Hydrologie–Hydrogéologie Surface Geosciences Hydrology–Hydrogeology |
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