AERMOD UPDATES
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Transcript of AERMOD UPDATES
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AERMOD UPDATESBeth EchelsKeith Zimmermann, P.E.
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The goal today is to discuss the progress and status of TCEQs implementation of AERMOD and how to streamline the review of your modeling.
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RECENT NEWSRECENT CHANGES TO: AERMET AERMAP AERMOD
OTHER NEWS
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AERMOD FAQsWhat are the most frequently asked questions that we hear from you?
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AERMET QUESTIONChoice of Preprocessed Meteorological DataShould I use:Low Roughness?Medium Roughness?High Roughness?
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Example of Low Roughness
Relatively flat area with homogeneous characteristics within the modeling domain.
Low grassFew treesVery low vegetationBarren land, mostly desert
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Example of Medium Roughness
Typical rural or suburban area with a mixture of vegetation (low and high) and scattering of trees, and buildings within the modeling domain.Tall crops and grassesScattering of treesSuburban areaMixture of low buildings and open areas
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Example of High Roughness
Typical urban and/or industrial area. Many buildings and structures or forested area.Buildings and structures closely packedForested areasHighly congested industrial area
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AERMAP QUESTIONUse of Terrain DataShould I:use DEMS?zero out the receptors, etc.?use the Non-regulatory default option?
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AERMOD QUESTIONMay I use the Urban Option?Requires:Roughness parameter valuePopulation valueIs it appropriate?
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We must all rely on experience and judgment in the proper use of dispersion models to demonstrate a reasonable worst case.
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How can I streamline my modeling review?
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RecommendationsUse the model input TemplatesAllows electronic submittal of data in a form conducive to automated checking.
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RecommendationsDocument your workExplain what you did and why you did it.Use current guidance for your report format.Submit all spreadsheets with calculations (Flare calculations, scaling calculations, etc.).
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RecommendationsProvide electronic copy of modeling input, output, and plot files.Input, output, downwash, and plot filesElectronic plot plan
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Questions?