Chemical Discharge Modeling System

CHEMMAP is a chemical discharge modeling and response system that predicts the transport, fate, and biological impacts of a wide variety of chemical substances in the marine environment and atmosphere.
Applications for CHEMMAP
  • Emergency response
  • Risk assessment
  • Contingency planning- including worst-case scenario
  • Natural resource damage assessment
  • Drills and education
  • Cost-benefit analysis
  • 3D chemical transport and fate model in water and air
  • Includes integrated GIS, compatible with other GIS tools
  • World-wide application
  • Includes algorithms for dissolution, evaporation, volatilization, sediment interaction, adsorption, shoreline interaction
  • Easy to interpret visualization of chemical concentrations over time
  • Seamlessly linked to AIRMAP
  • Biological exposure model to predict exposed fish and wildlife impacts
  • Extensive chemical database providing physical-chemical data for over 900 chemicals
  • EDS: Environmental Data Server integration
  • Available as Desktop application, Web-based tool, and ArcGIS extension

CHEMMAP Highlights

  • Chemical Fates Model
  • Atmospheric dispersion Model
  • Biological Exposure and Effects Model
  • Stochastic Model
  • Hazard Quotient Calculations
  • Interactive GIS
  • Access to real-time met-ocean data via EDS
CHEMMAP figure
Chemical Trajectory and Fates Module

    CHEMMAP simulates the following processes:

  • Initial plume dynamics
  • Slick spreading, transport, and entrainment of floating materials
  • Evaporation and volatilization (to atmosphere)
  • Transport and dispersion of dissolved and particulate materials in the water column and in the atmosphere
  • Dissolution and adsorption to suspended sediments
  • Sedimentation and resuspension
  • Natural degradation
  • Shoreline interaction
AIRMAP – Air Dispersion Module
  • Simulates 3D transport and fate of evaporated and volatilized chemical into the atmosphere
  • Integrates seamlessly with the results of the trajectory and fates model and associated meteorological data
  • Provides spatial and time varying predictions of atmospheric chemical concentrations
  • Calculates various time-weighted averages of atmospheric concentrations for evaluating hazardous conditions

CHEMMAP Hazard Quotient

For all CHEMMAP model options the Hazard Quotients also known as Predicted Effects Concentrations divided by Predicted No Effects Concentration (PEC/PNEC) can be readily calculated.

CHEMMAP figure
Biological Exposure and Effects Model

    The Biological Exposure model evaluates:

  • Area or water volume exposed above a selected threshold (i.e. a toxicological endpoint in US EPA ecological risk assessment terminology)
  • Dose aquatic biota are exposed to and the expected percent mortality from acute toxic effects
  • Direct-contact impacts to birds, mammals, and other wildlife
Stochastic Model

    The Stochastic Model predicts:

  • Range of expected contamination and the probability of exceeding thresholds of concern from a chemical discharge
  • Frequency distribution of model results, for which statistics are calculated and plotted
  • Worst case scenario