Contaminant Transport in Fractured Porous Media
Summary
Contaminant transport in fractured porous media encompasses the movement of dissolved or particulate substances through networks of fractures intersecting porous geological formations. Fluid flow is typically channelled within fracture apertures, while the surrounding rock matrix serves as a secondary reservoir that exchanges solute by diffusion. The interplay of advection in high‐permeability pathways and matrix diffusion into lower‐permeability blocks gives rise to complex breakthrough behaviour, non‐Fickian tailing and scale‐dependent dispersion. Predictive models range from continuum formulations, based on upscaled advection–dispersion equations, to discrete fracture network approaches that explicitly represent fracture geometry and connectivity. Alternative representations, such as channel network models, emphasise the dominant role of a limited number of preferential conduits. Understanding these processes is crucial for assessing the safety of nuclear waste repositories, predicting contaminant plumes in groundwater systems and designing remediation strategies. Recent advances have improved calibration protocols, uncertainty quantification and experimental tracers, yielding more robust risk assessments and guiding sustainable water resource management.
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Contaminant Transport in Fractured Porous Media publication trend
The graph below shows the total number of articles in contaminant transport in fractured porous media across all publications each year (not limited to Nature Index journals).
Technical terms
Fractured porous media: Geological material containing both a network of cracks or fractures and a porous matrix.
Matrix diffusion: The process by which solutes migrate from high‐velocity fractures into and out of the surrounding lower‐permeability rock matrix.
Advection–dispersion: Combined transport mechanism where solutes are carried by bulk fluid motion (advection) and spread out due to velocity variations and molecular diffusion (dispersion).
Breakthrough curve: A plot of solute concentration versus time measured at an observation point, used to characterise transport dynamics.
Discrete fracture network (DFN): A modelling approach that explicitly represents individual fractures and their connectivity to simulate flow and transport.
Channel network model: A simplified representation focusing on dominant flow pathways within a fracture network rather than every fracture segment.
References
- Channel Network Modeling of Flow and Transport in Fractured Rock at the Äspö HRL: Data‐Worth Analysis for Model Development, Calibration and Prediction. Water Resources Research (2023).
- Advection–Dispersion Behavior for Simulation of H-3 and Pu-238 Transport in Undisturbed Argillaceous Shale of a Near-Surface Repository. Toxics (2023).
- Uncertainty quantification of radionuclide migration in fractured granite. Journal of Cleaner Production (2022).
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