Volume 1: TRAQS User Guide (2018) / Chapter Skim
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Pages 125-137
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TRAQS User Guide Page 125 9. AERMOD OPTIONS Under the TRAQS main window, press the AERMOD Options button to have access to the input data for the AERMOD air quality analysis.
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TRAQS User Guide Page 126 Options Under this section, the following options are available: Title: Specify here a description for your TRAQS AERMOD project (optional)
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TRAQS User Guide Page 127 Dispersion Options In this section, you should specify if your modeling site is in an Urban or Rural setting. Urban Dispersion Options Population: This is the population for the urban area that will influence the heat island effect calculated by AERMOD.
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TRAQS User Guide Page 128 Population Density Procedure: Compute the average population density, p, per square kilometer with Ao as defined above - o If p > 750 people/km2, select the Urban option, o If p <= 750 people/km2, select the Rural option. Of the two methods above, the Land Use Procedure is considered a more definitive criterion.
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TRAQS User Guide Page 129 Meteorological Data Files If you selected "PM Project-Level Conformity Analysis" as the Analysis Type, then representative meteorological data, preprocessed by the US EPA AERMET program, for the most recent five consecutive years should be used. Under this section, you must specify the following: Surface Met File (SFC)
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TRAQS User Guide Page 130 Anemometer Base Elevation (MSL) Base Elevation (m)
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TRAQS User Guide Page 131 Parameter Urban Rural Bowen Ratio (Bo) - Average Wintertime 1.5 1.5 Surface Roughness Length, Zo (m)
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TRAQS User Guide Page 132 Source Pathway Options Source Parameters File: This file contains the information for all the road links and off-network links specified under the Map & Links module. These links are converted into the proper AERMOD source type and an input file is generated which includes the AERMOD keywords and parameters which fully describe the links and off-network links.
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TRAQS User Guide Page 133 9.4. AERMOD – RECEPTOR PATHWAY The Receptor Pathway tab of the AERMOD Options window contains the following options: Discrete Receptors Under the Discrete Receptors tab you will be able to specify and/or view discrete receptor locations to be included in the AERMOD modeling runs.
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TRAQS User Guide Page 134 5. Specifying: You can manually specify discrete receptors by pressing the Add button and entering X and Y coordinates directly into the grid.
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TRAQS User Guide Page 135 Grid Receptors Under the Grid Receptors tab you will be able to specify a Uniform Cartesian grid by specifying the following parameters: Center Coordinates (m) : X and Y coordinates, in meters, for the center of the grid.
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From page 136... ...
TRAQS User Guide Page 136 Additional Receptor Options You will be able to specify an external receptor pathway file using the option below. Include Receptors from External File: This option allows you to specify an external receptor file to be included in the AERMOD input files.
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TRAQS User Guide Page 137 9.5. RECEPTOR FILE FORMAT TRAQS allows you to specify an external Receptor Pathway file (*
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