The Canadian

Centre for Environmental Modelling and Chemistry

EQC Software Update

Version 2.02 - May 2003

Since version 2.01, released May 22, 2003:

The calculation of the concentration in the suspended particles (ug/m3 of particles) has been corrected after the identification of a typographical error.

The sum of the losses due to advection, in units of kg/h has been corrected. The individual loss rates and percent losses were unaffected by the error in the summation.

Since version 2.00, released May 16, 2003:

For the Level III calculation results, a unit conversion from the concentration of chemical present in the solid phases of soil and sediment, and in aerosols and suspended particles from g/m3 of solids to ug/g of solids was incorrect. This gave values 12 orders of magnitude too small in the tables. The unit conversions for the concentrations in air and water displayed (and printed) were performed twice making the values shown incorrect by many orders of magnitude.

The Splash screen contained the word "Beta". This has been removed.

Since version 1.01, released May 1997:

The model equations have been retained but the layout has been changed, additional options have been implemented, and various improvements made as follows.

Layout
  • The layout of information is consistent between model windows, and with other models developed at the Canadian Environmental Modelling Centre. The main window displays a schematic of the model with categories of input properties on the left and output parameters and results on the right. A Compute button separates the two halves to clearly distiguish between the model requirements and results. All input properties must selected by the user prior to the calculations being performed. None of the output parameters can be viewed until after the Compute button is pressed. The model schematic replaces the menu bar used previously.
  • Terminology has been updated to be consistent with recent work.

    Help
  • Help files have been improved and expanded.

    Calculations
  • The calculations used in the EQC model can be viewed, but not changed, by the user.

    Model Input
  • The user can input a simulation identifier and additional comments but is no longer required to do so.
  • Error checking on the chemical properties and emissions has been improved to avoid input errors.
  • All Environmental Properties are displayed on as model inputs, not just the Transport Velocities. None of these values can be changed by the user. It should be noted that it was always the intent to maintain a set environment within the EQC model. This model is designed to focus on chemical-to-chemical differences in environmental fate, not the influence of environmental properties.

    Model Output
  • The results of the Level I, II, and III calculations are displayed together to facilitate the forward progression in understanding from the simple case of thermodynamic equlibrium and no loss processes, through to steady-state.
  • The diagrams and charts now display a consistent set of information for all three Levels.
  • All printing is done from a single location. The user can select to print the data tables (including all input values and results for all three Levels), the summary diagrams, or the charts.
  • All input values are italicized in the printed output to facilitate future simulation duplication.
  • The entire simulation data (input and results) can be save to a file viewable by most common spreadsheet software.
  • A date and time stamp was added to both the save-to-file and the printed output.
  • All model output, whether viewed on screen, printed, or saved to a file, are identical except that values in the file are not formatted. This allows the user to see the whole number calculated by the model without any rounding effects.

    Model Description

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    Last updated August 12, 2011.