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dc.contributor.authorKang, Peter K.es_ES
dc.contributor.authorLe Borgne, Tanguyes_ES
dc.contributor.authorDentz, Marcoes_ES
dc.contributor.authorBour, Olivieres_ES
dc.contributor.authorJuanes, Rubénes_ES
dc.identifier.citationWater Resources Research 51(2): 940-959 (2015)es_ES
dc.description.abstractFlow and transport through fractured geologic media often leads to anomalous (non-Fickian) transport behavior, the origin of which remains a matter of debate: whether it arises from variability in fracture permeability (velocity distribution), connectedness in the flow paths through fractures (velocity correlation), or interaction between fractures and matrix. Here we show that this uncertainty of distribution- versus correlation-controlled transport can be resolved by combining convergent and push-pull tracer tests because flow reversibility is strongly dependent on velocity correlation, whereas late-time scaling of breakthrough curves is mainly controlled by velocity distribution. We build on this insight, and propose a Lagrangian statistical model that takes the form of a continuous time random walk (CTRW) with correlated particle velocities. In this framework, velocity distribution and velocity correlation are quantified by a Markov process of particle transition times that is characterized by a distribution function and a transition probability. Our transport model accurately captures the anomalous behavior in the breakthrough curves for both push-pull and convergent flow geometries, with the same set of parameters. Thus, the proposed correlated CTRW modeling approach provides a simple yet powerful framework for characterizing the impact of velocity distribution and correlation on transport in fractured media. © 2014. American Geophysical Union. All Rights Reserved.es_ES
dc.description.sponsorshipThe authors thank Nicolas Lavenant and Rebecca Hochreutener for their help in setting up and running the field experiments. Funding for this work was provided by the INTERREG IV project CLIMAWAT, the national network of hydrogeological sites H+ (hplus.ore.fr). MD acknowledges the support of the European Research Council (ERC) through the project MHetScale (617511). RJ acknowledges the support of the US Department of Energy (grant DE-SC0003907), and a MISTI Global Seed Funds award.es_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.subjectAnomalous transportes_ES
dc.subjectContinuous time random walkses_ES
dc.subjectFractured mediaes_ES
dc.subjectTracer testes_ES
dc.subjectVelocity correlationes_ES
dc.subjectVelocity distributiones_ES
dc.titleImpact of velocity correlation and distribution on transport in fractured media: Field evidence and theoretical modeles_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderEuropean Research Counciles_ES
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