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| Modflow - Surfact - The Most Versatile MODFLOW-Based Comprehensive Flow and Transport Model Available |
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MODFLOW-SURFACT is a comprehensive three-dimensional finite-difference flow and contaminant transport modeling code based on the USGS modular groundwater flow code, MODFLOW. Using new computational modules based on robust, efficient, and mass-conserving algorithms, MODFLOW-SURFACT overcomes limitations and eliminates restrictions associated with MODFLOW and its current transport counterparts. Examples include rewetting of drained cells, handling of pumping wells, solute mass balance problems, numerical dispersion and oscillations, and the implicit assumption of the negligible impact of transient flow storage effects on transport. MODFLOW-SURFACT is fully compatible with MODFLOW. This feature allows the user to import any previously created MODFLOW files with minimal effort.
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| New Features Available In MODFLOW-SURFACT Version 3.0 |
New PCG5 Module, developed by Dr. Peter Forsyth at the University of Waterloo, for increased robustness and efficiency. This solver can be up to 20 times faster than the PCG4 solver.
New FWL5 Package that uses a logarithmic well function to depict flow from the matrix block to the well node (as per the multi-node well (MNW) package of MODFLOW 2000). The FWL4 package in Version 2.2 assumes superposition to add the well-flow equations to those of the porous matrix.
New Reaction Module for specific reactions of interest in biodegradation of industrial contaminants as well as the capability of incorporating user-defined reactions among several mobile and immobile chemical component species.
New Curvilinear Grid option for non-rectangular grids in the areal plane.
Revised ET and RCH Packages to include zonal input of values via a separate time-series file, that is independent of the stress-period setup for varying boundary conditions.
Additional Packages from later versions of MODFLOW96 and 2000 including the Lake Package (LAK3), Gage Package (GAGE), Transient Flow and Head Boundary (FHB) package, and the Evapotranspiration Segments Package (ETS1).
Many more useful features such as cell-by-cell mass balance output and internal restart capability.
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MODFLOW-SURFACT
offers the following additional advanced capabilities:
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Fully and variably saturated flow and transport modeling
Treatment of prescribed-ponding recharge and seepage face conditions, as well as delayed yield
Linear or nonlinear retardation for each species
Adaptive time stepping provides robustness and efficiency to promote stability and convergence for both flow and transport simulations
Recharge package enhanced to overcome unphysical predictions for unconfined systems (e.g. the water table reaches or is above land surface)
Total Variation Diminishing (TVD) schemes for physically correct solutions with adaptive temporal weighting (between Crank-Nicholson and fully implicit) for maximum accuracy
Vapor flow for SVE and air sparging simulations
Multiphase, multicomponent contaminant transport modeling with biodegradation
Robust and efficient Newton-Raphson solver for nonlinear problems
Fractured porous media simulation with dual porosity
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| Visualization & Animation |
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MODFLOW-SURFACT is compatible with available MODFLOW-based Graphical User Interfaces (GUI), including GroundWater Vistas, Visual MODFLOW, GMS, PMWIN, ModIME, and Argus ONE for 2-D and 3-D visualization and animation capabilities. Two-dimensional visualization is utilized in both plan and cross-sectional views for contour plots, pathlines, and velocity vectors. Three-dimensional animation is the most effective way to observe the changes in parameters such as head and contaminant concentrations in a transient simulation. Three-dimensional visualization and animations have been used to depict but are not limited to: piezometric surfaces, pathlines, velocity vectors, and isosurfaces of contaminant plumes. |
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| Helping Communities |
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Project Review
Ecoseal reviewed the ACIAR Project on Sustainable Agriculture in Saline Environments through Serial Biological Concentration, which was carried out in Pakistan and Australia. |
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Seawater Intrusion Model for the Island of Kayts, Sri Lanka
Assessing sustainable water supply options for Kayts to limit the impact of saline groundwater upconing and saltwater intrusion along the northwest coast of Sri Lanka. |
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Groundwater Management Model for the Lower Murray, Australia
The aim of this project was to develop a groundwater management model which was used by natural resource managers and the community to better manage the groundwater resources of the Lower Murray. This region has been designated as a potential high-risk aquifer system.
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