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AERMOD Updates

AERMOD Updates. Robert Opiela, Technical Specialist Technical Program Support Section TCEQ, Air Permits Division Austin, Texas April 30, 2008. Introduction. Model Updates Modeling Guidance Updates. Model Updates. AERMET/AERMAP 06341 Mainly bug fixes AERMOD 07026 Mainly bug fixes

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AERMOD Updates

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  1. AERMOD Updates Robert Opiela, Technical Specialist Technical Program Support Section TCEQ, Air Permits Division Austin, Texas April 30, 2008

  2. Introduction • Model Updates • Modeling Guidance Updates

  3. Model Updates • AERMET/AERMAP • 06341 • Mainly bug fixes • AERMOD • 07026 • Mainly bug fixes • Only works with AERMET 06341 data

  4. Model Guidance Updates • Meteorological Data Inputs • What to do • How to do it • How to document it • Does it make any sense?

  5. Examples of Low Roughness

  6. Examples of Medium Roughness

  7. Examples of High Roughness

  8. Appropriate Roughness • Define Appropriate Modeling Domain • Depends upon sources in project • Low-level dominated, domain is small • High, hot stacks, domain is large • Area that influences the source most

  9. Appropriate Roughness • Qualitative Analysis • Land use is clearly dominant in modeling domain • Minimal explanation necessary

  10. Qualitative Example

  11. Appropriate Roughness • Quantitative Analysis • Data source of values used • Define land use categories • Show ALL calculations • Document ALL selections

  12. Quantitative Example

  13. Use of Urban Option • Questionable Application • Light winds • Clear skies • May not be applicable in sub-tropical conditions

  14. Use of Urban Option • Questionable Application • Uncertain of model implementation • Unclear on use of population data • Selection is Allowed • Provide a strong justification for selection

  15. Use of Terrain Data • Document Data Source • Do Not Interpolate Data • Use value of grid • May supplement if grid resolution not sufficient

  16. Streamlining Review Process • Use Modeling Input Data Templates • Consult with ADMT Staff Early in Process • Document ALL Selections, Assumptions, etc. • Not Following Guidance Causes Delays

  17. Summary • Use Latest Versions of AERMOD System • Follow Guidance on Model Selections • Assist in Streamlining Review Process • Be a Part of the Solution

  18. Questions

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