Models and Applications

The Toxics Program develops computer simulation and statistical models as an integral part of the Program's field investigations. The increased knowledge gained from the development and application of models greatly enhances the transfer value of research conducted at the sites and can have a significant effect on decisions related to human and environmental exposure and remedial alternatives. Information on the types of simulation and statistical models used by the program is available.

General Access to USGS Modeling Software:

• National Research Program Ground Water Software Page
  
• Surface-Water-Quality Modeling Interest Group (SMIG)
  
• Water Resources Applications Software

USGS Modeling Information

• Surface Water Hydrology, Mathematical Modeling Principles
  
• One Dimensional Transport with Inflow and Storage (OTIS): A Solute Transport Model for Streams and Rivers
• One Dimensional Transport with Equilibrium Chemistry (OTEQ): A Reactive Transport Model for Streams and Rivers (Internal access only)
• Precipitation - Runoff Modeling of Watershed Systems
  
• Solute Transport Simulation in Ground-Water Systems
  
• Fate and Transport of Immiscible Contaminants in the Subsurface
  
• Multiphase Flow, Transport, Reaction and biodegradation
  
• Application of Stochastic Processes in Hydrogeology
  
• Reaction-Transport Modeling In Ground-Water Systems
• Mathematical Simulation of Subsurface-Water Flow Using Uncertain and Incomplete Data
  
• Unsaturated Zone Field Studies -- Unsaturated Zone Transport Models
  

Headlines

• Tracer-Tests Steer Cleanup of Mined Watersheds

Fact Sheets

• Modeling Solute-Transport and Biodegradation with BIOMOC (Essaid and Bekins, 1998)
  
• Improving Ground-Water Flow Model Calibration with the Advective-Transport Observation (ADV) Package to MODFLOWP (Anderman, and Hill, 1998)
  
• Using OTIS to Model Solute Transport in Streams and Rivers (Runkel, 2000)
  
• Simulating Contaminant Attenuation, Double-Porosity exchange, and Water Age in Aquifers Using MOC3D (Goode, 1999)
  
• Simulating Transport of Volatile Organic Compounds in the Unsaturated Zone using the Computer Model R-UNSAT (Lahvis, and Baehr, 1998)
  
• Using Geochemical and Statistical Tools to Identify Irrigated Areas that Might Contain High Selenium Concentrations in Surface Water (Naftz, 1996)
  
• Nitrogen in the Mississippi Basin--Estimating Sources and Predicting Flux to the Gulf of Mexico (Goolsby and Battaglin, 2000)

Bibliographies

• Computer Simulation and Statistical Models
  
• Model Applications