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Modeling Dewatered Domains in Multilayer Analytic Element Models.

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This study introduces a stable numerical technique for multilayer analytic element models during dewatering. The method ensures sensible behavior by simulating dewatered layers as thin confined domains, allowing vertical flow while minimizing horizontal flow.

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Area of Science:

  • Hydrogeology
  • Numerical Modeling

Background:

  • Multilayer analytic element models are crucial for groundwater flow simulation.
  • Dewatering in these models can lead to numerical instability as saturated thickness approaches zero.

Purpose of the Study:

  • To develop a numerically stable technique for multilayer analytic element models experiencing layer dewatering.
  • To ensure sensible model behavior when saturated thickness diminishes.

Main Methods:

  • The proposed technique treats dewatered domains as very thin confined layers with a minimum saturated thickness (M).
  • M is an adjustable parameter to control horizontal flow in dewatered zones.
  • The method allows vertical flow through dewatered layers.

Main Results:

  • The technique provides sensible and numerically stable behavior in multilayer models during dewatering.
  • Horizontal flow in dewatered domains can be made negligibly small by adjusting M.
  • Vertical flow pathways are maintained through dewatered layers.

Conclusions:

  • The developed technique effectively handles dewatering in multilayer analytic element models.
  • This approach enhances the reliability of groundwater flow simulations in scenarios with reduced saturated thickness.
  • The method is validated through an example of mine dewatering simulation.