Paul van der Heijde
International Ground Water Modeling Center
Colorado School of Mines,
Golden, Colorado, 80401-1887
Phone: +1 303 273 3103
Fax : +1 303 384 2037
World Wide Web : http://www.mines.edu/igwmc/
Environmental Impact System/Geomedia Waste Containment Migration (EIS/GWM) is an environmental modelling platform that integrates databases, flow and contaminant migration models. Manages the geographical, physical, and chemical data collected for a case study, as well as grid design and editing, parameter allocation, execution and interaction of simulation module, and visualisation. Models can be built in 6 steps: (1) import the raster image from GIS, satellite, MS-Windows Clipboard, or AutoCAD images; (2) select modelling features using the toolbox; (3) generate 3D grid and assign parameters using kriging (generalised covariance scheme) (diagnosis phase); (4) run 3D modelling analyses and view heads, concentrations, fluxes, velocities and time series graphs, compare predictions with measured values for calibration; (5) examine health risk based upon EPA criteria (prognosis phase); (6) assess the quality of results and documentation in a text editor or word processing package. (7) use subgriding feature to achieve higher simulation granularity (resolution). Modelling tools include: zoom, pointer, distance, logpoints, transects, elevation contours, rivers, lakes, evapotranspiration area, recharge area, liner, slurry wall, annotation, rectangular area, polygonal area, subkriging domain, wells, drains, contamination source, pesticide zone, faults, data capturing window, rotation of the 3D view, add vertical or horizontal grid, and define boundary conditions (constant head, inactive head, variable head). Supports the following simulation capabilities: MODFLOW (USGS) for 3D flow modelling; MIFLOW generalised flow module including slurry walls, liners and faults; BIOREM-3D code for 3D multispecies (4 contaminants) migration simulation and interaction with up to six aerobic (oxygen) and anaerobic (nitrates, sulphates, ferrous iron, methane) nutrients; and CAPTURE for a 3D capture zone delineation including the formation's assimilative capacity. Output graphics include 2D and 3D contours of heads, health exposure risk and concentrations, 2D and 3D visualisation of vector fields (fluxes, velocities), time series graphs and zone-budget. Risk of exposure is assessed from the Lifetime Average Daily Intake (LADI) estimates based on concentration levels at "receptors" as projected (simulated) by the models. Distributed in two versions: 1) Lite includes: 2-dissolved species, one contaminant, one Electron Acceptor, all 3D, and capture zone 2) Pro includes: Full Kriging, Subgriding, Risk of Exposure, Cost Module, multispecies, 4 contaminants, aerobic/anaerobic biodegradation, 6 Electron Acceptors, bioslurry walls, other treatment/ containment features, and capture zone.