Experimental evidence of the anisotropy of tracer dispersion in rough fractures with sheared walls - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Water Resources Research Année : 2009

Experimental evidence of the anisotropy of tracer dispersion in rough fractures with sheared walls

Résumé

Dispersion experiments are compared for two transparent model fractures with identical complementary rough walls but with a relative shear displacement $\vec{\delta}$ parallel ($\vec{\delta}\parallel \vec{U}$) or perpendicular ($\vec{\delta} \perp \vec{U}$) to the flow velocity $\vec{U}$. The structure of the mixing front is characterized by mapping the local normalized local transit time $\bar t(x,y)$ and dispersivity $\alpha(x,y)$. For $\vec{\delta} \perp \vec{U}$, displacement fronts display large fingers: their geometry and the distribution of $\bar t(x,y)U/x$ are well reproduced by assuming parallel channels of hydraulic conductance deduced from the aperture field. For $\vec{\delta} \parallel \vec{U}$, the front is flatter and $\alpha(x,y)$ displays a narrow distribution and a Taylor-like variation with $Pe$.
Fichier principal
Vignette du fichier
article.pdf (208.9 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00322849 , version 1 (18-09-2008)

Identifiants

Citer

Alejandro Boschan, Harold Auradou, Irene Ippolito, Ricardo Chertcoff, Jean-Pierre Hulin. Experimental evidence of the anisotropy of tracer dispersion in rough fractures with sheared walls. Water Resources Research, 2009, 45, pp.W03201. ⟨10.1029/2008WR007461⟩. ⟨hal-00322849⟩
132 Consultations
112 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More