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Título: | Transport Upscaling under Flow Heterogeneity and Matrix-Diffusion in Three-Dimensional Discrete Fracture Networks |
Autor: | Hyman, Jeffrey D.; Dentz, Marco CSIC ORCID | Palabras clave: | Fracture networks Matrix diffusion Solute transport Injection modes Continuous time random walks |
Fecha de publicación: | sep-2021 | Editor: | Elsevier | Citación: | Advances in Water Resources 155: 103994 (2021) | Resumen: | We investigate the combined effects of network scale flow variability and retention due to matrix-diffusion on the scaling behavior of transport through fractured media. Two of the principal mechanisms controlling the transport of solutes through fractured low-permeability media are broad distributions of flow velocities and retention times in the solid matrix. We study the relative impact of these two processes under different initial conditions using a set of three-dimensional discrete fracture network simulations. We use these simulations to develop and calibrate an upscaled continuous time random walk (CTRW) approach for advective transport based on an Ornstein-Uhlenbeck model for the particle velocities that accounts for the fracture-matrix coupling using a compound Poisson process. This CTRW model can be conditioned on the initial solute distribution and allows to observe late-time scaling behavior at distances beyond what is feasible to observe using high-fidelity direct numerical simulations. We determine that the initial distribution of particles leads to marked differences in the persistent long-term scale behavior in the solute travel time distributions, even those undergoing retention due to matrix diffusion through implementation and analysis of the model. | Versión del editor: | https://doi.org/10.1016/j.advwatres.2021.103994 | URI: | http://hdl.handle.net/10261/250645 | DOI: | 10.1016/j.advwatres.2021.103994 |
Aparece en las colecciones: | (IDAEA) Artículos |
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DFN_CTRW_OU_MDR_preprint.pdf | Artículo principal | 1,62 MB | Adobe PDF | Visualizar/Abrir |
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