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Modifications to the Conduit Flow Process Mode 2 for MODFLOW-2005.

Thomas Reimann1, Steffen Birk, Christoph Rehrl

  • 1TU Dresden, Institute for Groundwater Management, D-01062 Dresden, Germany. Thomas.Reimann@tu-dresden.de

Ground Water
|March 5, 2011
PubMed
Summary
This summary is machine-generated.

This study modifies the Conduit Flow Process Mode 2 (CFPM2) for MODFLOW-2005 to better simulate turbulent groundwater flow in karst aquifers. The enhanced model uses a generalized power function, improving accuracy and efficiency for conduit flow simulations.

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Area of Science:

  • Hydrogeology
  • Geosciences
  • Environmental Engineering

Background:

  • Karst aquifers feature conductive caves and conduits due to rock dissolution.
  • Groundwater flow in these conduits can be turbulent, requiring nonlinear functions.
  • Existing models like MODFLOW-2005 often simplify or struggle to accurately represent this turbulence.

Purpose of the Study:

  • To enhance the Conduit Flow Process Mode 2 (CFPM2) for MODFLOW-2005.
  • To improve the simulation of turbulent groundwater flow within karst conduit systems.
  • To overcome limitations of the original CFPM2 formulation regarding Reynolds numbers and convergence.

Main Methods:

  • Modified the existing CFPM2 code.
  • Implemented a generalized power function with a user-defined exponent.
  • Coupled continuum groundwater flow models with pipe network representations.

Main Results:

  • The modified CFPM2 accurately replicates turbulent flow in both porous media and pipes.
  • The new formulation eliminates the need for iterative hydraulic conductivity adjustments, reducing computational time.
  • Successfully validated against simple benchmark test problems.

Conclusions:

  • The modified CFPM2 provides a more efficient and accurate approach for simulating turbulent groundwater flow in karst conduits.
  • This advancement aids in better understanding and modeling complex karst aquifer systems.
  • The generalized power function offers flexibility for various flow regimes.