Modeling Tip: Using 3D Receptor Grid in AERMOD

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Receptors are specific locations where AERMOD will compute a concentration or deposition value. In an AERMOD analysis, at least one receptor must be defined in order for the model to run successfully. To assist modelers in including receptors into their AERMOD scenarios, BREEZE AERMOD offers users with a wealth of options and ways for creating model objects and for entering their parameters. For example, in BREEZE AERMOD receptor elevations can be processed with the embedded U.S. EPA AERMAP program or they can be manually entered. BREEZE AERMOD also provides multiple ways for users to enter sources and receptors, whether it be by adding a model object in the Map tab, copying and pasting from an Excel spreadsheet, or manually entering the data in a data entry window.

Additionally, BREEZE AERMOD offers users the ability to quickly and easily generate 3D receptor grids via the Cartesian Grid model object, which allows for the computation of concentrations at multiple heights above ground level. A 3D Cartesian grid network includes an array of points identified by the X (east - west) and Y (north - south) coordinates, as well as the heights above ground level (Z Levels) for each 2D grid. This type of analysis is useful to determine the flow and density of the plume at a specific time, providing a more in-depth analysis.

  1. Navigate to the Map tab and select Cartesian Grid option in the Receptors dropdown menu.

Cartesian Grid option

  • For a Cartesian grid, place the mouse at the southwest corner of the desired grid and hold and drag the left mouse button until the desired receptor size is reached.
  • In the Gridded Receptor Network dialog, select the 3D Cartesian grid from the Grid type and enter the parameters of the receptor grid.

AERMOD - Setting up Cartesian Grid

  • After setting up your AERMOD scenario, in order to graphically display the concentrations at the receptors in the 3D Cartesian Grid, select the output you desire. A tab will be displayed for each output option selected for which you will need to select specific output criteria.

AERMOD - 3D Cartesian Grid Output

  • Run the model by selecting the Model Run icon in the Project Tab. Upon completion, launch the post-processor, 3D Analyst, which may be used to create graphical displays of results similar to the image shown below that was created in the 3D tab using the Plot file.

AERMOD-3D Catesian Grid Result

 

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