Air dispersion models are only capable of calculating concentration at specific locations. These locations are called receptors. In the U.S. EPA’s AERMOD air dispersion model, concentration calculations at each receptor are done at the ground level as opposed to some height above ground.
A key feature of Lakes Software’s commercial products is the ability to easily import base maps in a wide variety of file formats. Supported formats include raster images (e.g., JPG, BMP, PNG, GIF, etc.), AutoCAD DXF, Digital Line Graphs (DLG), Shapefiles, and more.
One feature of the CALPUFF model is the ability to depict coastal interaction effects. Since the land surface can heat more rapidly than adjoining water, a Thermal Internal Boundary Layer (TIBL) can form and bring elevated source plumes close to the ground.
Previous Modeling Tips have covered different aspects of identifying plant boundaries in an AERMOD View project. This modeling tip describes plant boundary visualization capabilities and the ability to separate onsite and offsite impacts.
AERMAP is the US EPA’s terrain preprocessor for the AERMOD modeling system. AERMAP reads digital terrain and calculates base elevations for sources and receptors and hill height scale factors for receptors.
The AERMOD air dispersion model allows users to input time-varying concentration data to represent background sources to be added to the model’s calculations. This can be done by directly adding background concentrations to modeled pollutant concentrations or, in the case of nitrogen dioxide (NO2), by adding background ozone or NOx concentrations to assist in estimating how much NO2 is formed through chemical transformation.