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  • Ponencia: Dispersion upscaling in highly heterogeneous aquifers: The prediction of tracer dispersion at the Macrodispersion Experiment (MADE) site

Formación, cursos, eventos y seminarios

Ponencia: Dispersion upscaling in highly heterogeneous aquifers: The prediction of tracer dispersion at the Macrodispersion Experiment (MADE) site

Ciclo de webinars gratuitos en Hidrogeología y Geoquímica
TODOS LOS JUEVES en directo en: https://meet.google.com/snb-qdkn-eex   
 
Link de la presentación: Presentation_Dispersion_upscaling_1
GRUPO DE HIDROLOGÍA SUBTERRÁNEA
(Unidad asociada CSIC-UPC)

 

Esta semana: Jueves 02 de Julio a las 12:15h
 
Ponente: Marco Dentz. Profesor de Investigación CSIC
Ponencia: Dispersion upscaling in highly heterogeneous aquifers: The prediction of tracer dispersion at the Macrodispersion Experiment (MADE) site
Marco Dentz, Alessandro Comolli, Vivien Hakoun, and Juan Hidalgo
 
Abstract
We derive an upscaled model for the prediction of the plume evolution in highly heterogeneous aquifers based a stochastic transport representation in terms of continuous time random walks. Transport is modeled
through advective motion of idealized solute particles, which changes their speed at fixed distances. The series of particles speeds is modeled as a stationary Markov chain. The derived model is parameterized by the
correlation length, mean and variance of the log-hydraulic conductivity, the mean hydraulic gradient and porosity. Furthermore, it can be conditioned on the conductivity and tracer data at the injection region. 
The model predicts the main features of the non-Fickian evolution of the longitudinal concentration profile observed during the MADE-1 and MADE-2 experiments. The mass distribution is characterized by strong localization at the injection region and
a strong forward tail. These features are explained by heterogeneity of hydraulic conductivity heterogeneity, and the correlated motion of particles according to spatially persistent Lagrangian flow speeds.
 
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