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A Multi-Conceptual Model Approach to Untangling the MADE Experiment.

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Summary
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This study addresses unresolved issues in modeling solute transport at the Macrodispersion Experiment (MADE) site. By integrating a knowledge framework and multi-conceptual models, it offers a holistic approach to understanding flow and transport in heterogeneous porous media.

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Area of Science:

  • Environmental Science
  • Hydrogeology
  • Geochemistry

Background:

  • The Macrodispersion Experiment (MADE) investigated solute transport in heterogeneous porous media.
  • Previous modeling efforts often overlooked critical experimental complexities.

Purpose of the Study:

  • To systematically assess knowns and unknowns in MADE tracer experiments using a knowledge framework.
  • To develop multi-conceptual models for a holistic understanding of flow and transport.
  • To address unresolved issues in modeling the MADE tracer experiments.

Main Methods:

  • Review of original field tracer experiments at the MADE site.
  • Integration of experimental issues (non-stationary flow, hydraulic conductivity reliability, mass imbalance, 3D architecture, vertical gradients) into a knowledge framework.
  • Generation of multi-conceptual models.

Main Results:

  • Identified significant issues in previous MADE modeling efforts.
  • Demonstrated a workflow integrating a knowledge framework and multi-conceptual models.
  • Provided a pathway for improved interpretation of tracer concentrations at heterogeneous sites.

Conclusions:

  • A knowledge framework coupled with multi-conceptual models enhances understanding of flow and transport in heterogeneous media.
  • This approach facilitates a more accurate interpretation of tracer data in complex subsurface environments.
  • The study offers a constructive dialogue for resolving modeling challenges at sites like MADE.