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Kewei Chen1, Hongbin Zhan1

  • 1Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-3115, USA.

Journal of Contaminant Hydrology
|April 14, 2018
PubMed
Summary
This summary is machine-generated.

A new Green's function approach models reactive solute transport in parallel fracture-matrix systems. Neglecting longitudinal matrix diffusion can lead to inaccurate concentration profiles, especially near the entrance.

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Area of Science:

  • Environmental science
  • Hydrogeology
  • Geochemistry

Background:

  • Solute transport in fractured rock is critical for understanding contaminant migration.
  • Existing models often simplify fracture-matrix interactions, neglecting key transport processes.
  • Accurate modeling is essential for managing groundwater contamination in fractured porous media.

Purpose of the Study:

  • To develop an innovative Green's function approach for 2-D reactive solute transport in parallel fracture-matrix systems.
  • To accurately calculate mass exchange between fractures and matrix.
  • To assess the impact of neglecting longitudinal matrix diffusion and transverse fracture dispersion.

Main Methods:

  • Developed a Green's function approach for 2-D reactive solute transport.

Related Experiment Videos

  • Numerically calculated the flux at the fracture-matrix interface.
  • Applied the model to a real-world non-aqueous-phase-liquid (DNAPL) contamination case.

    • Main Results:

    • Transverse dispersion in fractures can be safely neglected due to small apertures.
    • Neglecting longitudinal matrix diffusion leads to overestimation near the source and underestimation downstream.
    • The error from neglecting longitudinal diffusion decreases with increasing Peclet number.
    • Longitudinal matrix diffusion has minimal long-term impact on concentration profiles.

    Conclusions:

    • The Green's function approach provides a robust method for modeling complex solute transport.
    • Longitudinal matrix diffusion is a significant factor influencing short-term concentration profiles.
    • The model accurately simulates Trichloroethylene (TCE) behavior in a DNAPL contamination scenario, showing high matrix storage.