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An active region model for capturing fractal flow patterns in unsaturated soils: model development.

H H Liu1, R Zhang, G S Bodvarsson

  • 1Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA. hhliu@lbl.gov

Journal of Contaminant Hydrology
|August 16, 2005
PubMed
Summary

Preferential flow in unsaturated soils can contaminate groundwater. This study introduces a fractal active region model to better predict this rapid solute movement, improving groundwater protection strategies.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Hydrology

Background:

  • Preferential flow in unsaturated soils facilitates rapid solute transport to groundwater.
  • This bypasses soil volumes, increasing contamination risks.
  • Observed field patterns suggest fractal characteristics.

Purpose of the Study:

  • To develop a model incorporating fractal flow patterns into the continuum approach.
  • To address the limitations of traditional models in predicting preferential flow.
  • To enhance understanding of solute transport in heterogeneous soil environments.

Main Methods:

  • Developed a simple active region model dividing the flow domain into active (fractal) and inactive regions.
  • Derived a new constitutive relationship linking the active region portion to soil saturation.

Related Experiment Videos

  • Integrated fractal geometry into a continuum-based soil flow model.

    • Main Results:

    • The model successfully incorporates fractal flow patterns into the continuum approach.
    • A novel constitutive relationship for the active region was established.
    • Model predictions showed consistency with field observations of fractal flow.

    Conclusions:

    • The active region model provides a more accurate representation of preferential flow.
    • Fractal geometry is key to understanding and modeling rapid solute transport.
    • The model enhances the prediction of groundwater contamination risk from soil surface inputs.