MODFLOW-SURFACT™

Overview:

MODFLOW-SURFACT is a powerful 3D finite-difference flow and transport modeling code for analyzing subsurface systems. It offers substantial advancements over public-domain versions of MODFLOW. For example, MODFLOW-SURFACT addresses rewetting of drained cell, handling of pumping wells, solute transport problems, numerical dispersion and oscillations, and impacts of transient flow storage effects on transport. MODFLOW-SURFACT includes advanced computational modules that are based on robust, efficient, mass-conserving algorithms, making it faster and more accurate than its transport modeling counterparts.

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Comprehensive Simulation Capabilities:

  • Fully and variably saturated flow and contaminant transport modeling
  • Prescribed-ponding recharge and seepage face conditions, as well as delayed yield
  • Time-varying material properties
  • Density-dependent groundwater flow and  solute transport
  • Fractured porous media simulation with discrete fractures and dual porosity conceptualization
  • Non-aqueous phase liquid (NAPL) source release in the vadose zone, vapor flow for soil vapor extraction (SVE), and air sparging (AS) simulations
  • Multi-phase, multi-component contaminant transport modeling with biodegradation
  • Reaction Module with several reactions of mobile and immobile chemical species—invaluable for modeling biodegradation of industrial contaminants
  • Groundwater flow and heat transport – capability to perform subsurface thermal energy storage/ recovery and geothermal simulations

Robust and Efficient Computational Algorithms:

  • Curvilinear Grid option for orthogonal structured grids in the areal plane and option to use distorted grid in the vertical plane
  • Axi-symmetric (2-D vertical plane) grid option for single well flow and transport simulations
  • Robust and efficient Newton-Raphson scheme for nonlinear problems
  • Robust PCG5 Module up to 20 times faster than PCG4 solver. (Developed by Dr. Peter Forsyth at the University of Waterloo.)
  • Adaptive time-stepping to promote stability and convergence for flow and transport simulations
  • Total Variation Diminishing (TVD) schemes for no-oscillation transport solutions with adaptive temporal weighting

Rationale for Selecting MODFLOW-SURFACT™

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