Integrated GIS and Model Simulation Output
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.
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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