Model Development, Improvement, and Application

A large part of the Toxic Substances Hydrology (Toxics) Program's technology transfer activities includes making computer simulation models available to the public for download. Models, developed as problem-solving tools, are published and supported by the developers and expert users.

Recent Model products:

• New Version of NAS (Natural Attenuation Software) Available
• Biodynamic Model is Unraveling the Complexities of Metal Bioaccumulation from Contaminated Sediments
• New Model Improves Understanding of the Transport of Carbon Isotopes in the Unsaturated-Zone
• A Simple Method for Calculating Growth Rates of Petroleum Plumes
• National Fish Mercury Model
• 1-D Transport with Inflow and Storage (OTIS): Solute Transport in Streams and Rivers
• VOC Transport in the Unsaturated Zone (R-UNSAT, Air 2-D, Air 3-D)
• Tracer-Tests Steer Cleanup of Mined Watersheds
• Natural Attenuation Software (NAS) Guides Remediation
• Simulating transient, variably saturated, coupled water-heat-solute transport in 2-D, variable density, ground-water systems
• Property-transfer models and Property transfer from particle and aggregate size to water retention
• Modeling Np and Pu transport -- implications for reactive transport modeling and performance assessments of nuclear waste disposal sites
• Comparison of approaches for simulating reactive solute transport involving organic degradation reactions by multiple terminal electron acceptors
• Simulation of the mobility of metal-EDTA complexes in groundwater--The influence of contaminant metals
• Modeling enhanced in situ denitrification in groundwater
• Reactive-transport simulation of phosphorus in the sewage plume at the Massachusetts Military Reservation
• Evaluating remedial alternatives for an acid mine drainage stream--Application of a reactive transport model
• Modeling hyporheic zone processes
• Flow and transport response to paleoclimatic forcing in thick desert vadose zones--measurement, modeling, and uncertainty
• Calculation of individual isotope equilibrium constants for implementation in geochemical models
• Simulated pond-aquifer interactions under natural and stressed conditions near Snake Pond, Cape Cod, Massachusetts
• The use of mass-loading studies and solute transport modeling to assist in the development of TMDL's for streams affected by mine drainage

The Toxics Program also transfers new technology to beneficiaries through the following mechanisms:

• Publications
• Training Courses, Workshops, and Lectures
• Conference Sponsorship
• Field and Laboratory Methods Development and Application

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