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MODFLOW/MT3DMS-based simulation of variable-density ground water flow and transport.

Christian D Langevin1, Weixing Guo

  • 1US Geological Survey, Fort Lauderdale, FL 33315, USA. langevin@usgs.gov

Ground Water
|May 10, 2006
PubMed
Summary

This study introduces a coupled MODFLOW and MT3DMS approach for simulating variable-density groundwater flow and solute transport. The SEAWAT code accurately models complex scenarios, validated by benchmark problems.

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Area of Science:

  • Hydrogeology
  • Computational Fluid Dynamics
  • Environmental Engineering

Background:

  • Simulating variable-density groundwater flow is crucial for understanding saltwater intrusion and contaminant transport.
  • Existing models often require significant modifications or specialized pre/post-processors.

Purpose of the Study:

  • To present a modified approach for coupling MODFLOW and MT3DMS to simulate variable-density groundwater flow.
  • To minimize changes to existing MODFLOW and MT3DMS input files for broader applicability with the SEAWAT code.

Main Methods:

  • Modified MODFLOW routines to solve the variable-density groundwater flow equation.
  • Incorporated an equation of state to calculate density based on MT3DMS solute concentrations.
  • Tested the coupled approach using the Henry problem and two salt pool laboratory experiments.

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Main Results:

  • Simulations for the Henry problem showed good agreement with analytical and finite-element solutions.
  • Breakthrough curves for the salt pool experiments demonstrated reasonable agreement with laboratory data, especially for low-density cases.
  • Salinity isosurface comparisons for the salt pool experiments showed good agreement for both low- and high-density cases.

Conclusions:

  • The coupled MODFLOW/MT3DMS approach, implemented in the SEAWAT code, provides accurate solutions for variable-density groundwater flow and solute transport.
  • The method is efficient, requiring minimal changes to existing input files, thus enhancing usability with various pre- and post-processors.