1-D Modeling of Natural Attenuation Processes

BioTracker is a specialized natural attenuation screening model that incorporates unique visualization tools for assessing the natural attenuation of chlorinated solvents. Special calibration tools allow you to quickly assess the fit between the modeling results and your field data.

The BioTracker model interface is integrated with the same Project Data Management System and chemical properties database (CHEMbase) used by other MoNA ToolKit products such as SEQUENCE and BioTrends. This means that the model simulation results can easily be compared to field data which is automatically extracted from the project database.

The simulation code behind the BioTracker system is based on a 3-D finite difference numerical model called BioRedox. This model was developed based on MT3D to simulate coupled biodegradation-redox reactions. The current version of BioTracker is capable of modeling one-dimensional, multi-species contaminant transport in groundwater using a uniform groundwater velocity. BioTracker is capable of simulating straight-chain sequential transformation reactions for any number of chlorinated solvent or radio nuclide daughter products.

BioTracker is also capable of simulating the accumulation of chloride which is known to occur during the sequential reduction of chlorinated species such as TCE, DCE, and vinyl chloride.

BioTracker has been developed with a unique visualization tool that allows model simulation results to be overlaid directly on a site map. A special particle tracking algorithm is used to delineate the primary flowpath downgradient from the source zone, based on observed groundwater elevations. The one-dimensional grid is then aligned along this flowpath, and "stream-tube" contours are used to show the model results on the site map.

The image below shows an example of a BioTracker 1-D model grid that was determined based on a particle tracking routine (which used a Surfer contour (GRD) file of measured groundwater elevations as input).

Potential applications for BioTracker include the following:

  • Calibrate biodegradation rates for petroleum hydrocarbons, chlorinated solvents (including optional chloride accumulation) or radio nuclides;
  • Assess the future extent of plume migration downgradient from source areas;
  • Evaluate remediation time frames for natural attenuation;
  • Calculate trigger levels for key monitoring wells downgradient from source areas; and/or
  • Simulate the effects of source removal on off-site plumes.

Distinct advantages of BioTracker include:

  • More accurate representations of chlorinated solvent reactions than public domain screening models
  • Significantly faster to implement than 2-D or 3-D models
  • Unique visualization capabilities for viewing model results on a site map (e.g., stream-tube contours and SEQUENCE diagrams)
  • Direct link between BioTracker and SEQUENCE for efficient calibration of multi-species models

Click Here To Go To The MoNA ToolKit Page

Click Here For Information On The Project DMS

Click Here For More Information On SEQUENCE

Back to BioTrends Main Page


BioTracker includes a comprehensive user's manual containing easy-to-follow instructions and step-by-step tutorials to guide you through the process of creating a project database and using the data analysis tools.

Hardware Requirements

  • PC Pentium (100 MHz)
  • 32 Mb RAM
  • 25 Mb free disk space
  • SVGA display and mouse
  • Windows 95/98 or NT installed

BioTrends Detailed Description