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A Practical Grid-Based Alternative Method to Advective Particle Tracking.

M A Sbai1

  • 1BRGM (French Geological Survey), Water and Environment Division (D3E), Water Management Group, 3, Avenue Claude-Guillemin, BP 36009, 45060 Orléans Cedex 2, France.

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Finite-difference, grid-based methods offer a more robust alternative to conventional particle tracking for groundwater modeling. This approach accurately visualizes groundwater flow paths and capture zones with computational efficiency.

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Area of Science:

  • Hydrogeology
  • Computational Fluid Dynamics
  • Environmental Engineering

Background:

  • Advective particle tracking is a common but limited groundwater modeling technique.
  • Existing methods lack robustness for general groundwater flow and transport applications.

Purpose of the Study:

  • To investigate finite-difference, grid-based methods as a robust alternative to particle tracking for groundwater modeling.
  • To demonstrate the utility of this method for delineating groundwater capture and swept zones.
  • To showcase its capability in simulating travel times and residence time distributions.

Main Methods:

  • Utilized industry-standard, finite-difference, grid-based numerical methods.
  • Classified the approach as a specific case of forward/backward-in-time advective-dispersive probabilistic transport.
  • Applied the method to visualize capture zones, swept zones, and partitions in groundwater systems.

Main Results:

  • Accurately delineated and visualized capture zones around abstraction wells and swept zones around injection wells.
  • Successfully visualized partitions for injection-pumping well doublets and boundary pairs.
  • Robustly simulated and visualized forward/backward travel times and residence time distributions with minimal computational effort.

Conclusions:

  • Finite-difference, grid-based methods provide a comprehensive and robust screening tool for groundwater applications.
  • The proposed method offers a superior alternative to conventional particle tracking, enhancing visualization and simulation accuracy.
  • This approach serves as an effective intermediate step before complex time-dependent advective-dispersive simulations.