AERMOD
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Overview
- AERMOD is a steady-state plume model that incorporates air dispersion based
on planetary-boundary-layer turbulence structure and scaling concepts,
including treatment of both surface and elevated sources, and both
simple and complex terrain.
- It
uses other programs (AERMET and AERMAP) as run separately as
pre-processors to create the needed meteorology files and receptor
location files that can be used as input to AERMOD.
Used For*
- For short-range dispersion (within 50 km of the source).
- Source types: Multiple point, area and volume sources
- Source releases: Surface, near surface and elevated sources
- Source locations: Urban or rural locations. Urban effects are scaled by population.
- Plume types: Continuous, buoyant plumes
- Plume deposition: Dry or wet deposition of particulates and/or gases
- Plume dispersion treatment: Gaussian model treatment in
horizontal and in vertical for stable atmospheres. Non-Gaussian
treatment in vertical for unstable atmospheres
- Terrain types: Flat, or flat with simple hills (but not steep terrain mountains & valleys) **
- Building effects: Handled by BPIP-PRIME downwash algorithms
- Meteorology data height levels: Accepts meteorology data from multiple heights
- Meteorological data profiles: Vertical profiles of wind, turbulence and temperature are created
* from Wikipedia. ** from Stull.
Overview Slides by Davi Monticelli : How to organize work folders ; AERMET Download Met Data ; AERMET Stages 1-3 ; AERMOD Theory & Practice ; Examples .
Types of Inputs
- Intro slides by Stull.
- Useful values for the Bowen Ratio , Albedo , Roughness Length .
Example of AERMOD use in an Environmental Impact Statement (2017)
- Appendix C. Modeling Technical Support Document for the Miami (Arizona) Sulfur Dioxide (SO2) Nonattainment Area.
A python version of AERMOD by Costanzini et al, 2018. (not EPA approved)
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Links for the 2021 course:
The fortran source code, sample input files, and PC/Windows executables are available on the EPA web page:
https://www.epa.gov/scram/air-quality-dispersion-modeling-preferred-and-recommended-models#aermod
For Windows users…Good news:
- You can just download the pre-compiled executables from the web site above …no compiling required!
- Or, you can still follow along with the Mac/Linus instructions below, but using Powershell or Cygwin to run on the command line.
- But even better…AERMOD software was made with Windows users in mind, so all of the compilation scripts are already ready-to-go.
For Mac/Linux users, Tim Chui created these AERMOD installation instructions updated in Dec 2021 to install AERMOD + AERMET + AERMAP.
We’ll be following this for the AERMOD/AERMET/AERMAP installation class. Feel free to take a look before class, but it’s not necessary…we’ll be going through it all step-by-step in class.
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Links for the 2018 course:
The EPA recommended air quality dispersion models are AERMOD and CALPUFF: https://www.epa.gov/scram/air-quality-dispersion-modeling-preferred-and-recommended-models
AERMOD Model Dynamics, Physics & Parameterizations:
See AERMOD Model Formulation (2018):
https://www3.epa.gov/ttn/scram/models/aermod/aermod_mfed.pdf
We will discuss this in class, so that AERMOD is not a "black box" to you.
Here is a link to the installation instructions from the 2018 course at UBC.
There are 3 major sections below, for installing and testing:
A. AERMOD
B. AERMET
C. AERMAP
Additional links from the 2016 version of this course:
Model Dynamics, Physics & Parameterizations
- AERMOD Model Formulation Document http://www.epa.gov/ttn/scram/7thconf/aermod/aermod_mfd.pdf
- AERMOD addendum: http://www.epa.gov/ttn/scram/7thconf/aermod/Addendum_to_MFD_v15181.pdf
- AERMET User Guide & Addendum: http://www.epa.gov/ttn/scram/7thconf/aermod/aermet_userguide.zip
- BPIP-PRIME User Guide & Addendum:
Code sources
- AERMOD to calculate pollutant concentrations: http://www3.epa.gov/ttn/scram/dispersion_prefrec.htm#aermod
- AIRMET pre-processor for meteorology (run before running AERMOD) http://www3.epa.gov/scram001/metobsdata_procaccprogs.htm
- BPIPPRM pre-processor for building downwash (run before AERMOD) http://www3.epa.gov/ttn/scram/dispersion_related.htm#bpipprm
- AERMAP terrain pre-processor (run before AERMOD) http://www3.epa.gov/ttn/scram/dispersion_related.htm#aermap
- MMIF converts WRF output to AERMOD input (run before AERMOD) http://www3.epa.gov/ttn/scram/dispersion_related.htm#mmif
- AERPLOT converts AERMOD output to kmz file for Google Earth. (run after running AERMOD) http://www3.epa.gov/ttn/scram/dispersion_related.htm#aerplot
Utility Functions
- R scripts for drawing contour lines and filled contours. plot3D (Jan 2016) , bulit-in functions , more , more2 ,
Model running resources
- Install and compile AERMOD on your own Macs. (our TA Matt has step-by-step instructions -v1.2 )
- AERMOD Users Manual as pdf (or http://www.epa.gov/ttn/scram/models/aermod/aermod_userguide.zip )
- Install and compile AERMET meteorological pre-processor on your Mac. (tips from TA Matt, with help from Pedro)
Other Resources
- Paper by Stull & Ainslie 2006: A simple model for pollution dispersion in a convective boundary layer. JAMC.
- PowerPoint about Building Downwash - Problems, Solutions & Next Generation , by Ron Peterson, Aug 2015.
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