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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

AERMOD Updates

Robert Opiela, Technical Specialist

Technical Program Support Section

TCEQ, Air Permits Division

Austin, Texas

April 30, 2008

introduction
Introduction
  • Model Updates
  • Modeling Guidance Updates
model updates
Model Updates
  • AERMET/AERMAP
    • 06341
    • Mainly bug fixes
  • AERMOD
    • 07026
    • Mainly bug fixes
    • Only works with AERMET 06341 data
model guidance updates
Model Guidance Updates
  • Meteorological Data Inputs
    • What to do
    • How to do it
    • How to document it
    • Does it make any sense?
appropriate roughness
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
appropriate roughness1
Appropriate Roughness
  • Qualitative Analysis
    • Land use is clearly dominant in modeling domain
    • Minimal explanation necessary
appropriate roughness2
Appropriate Roughness
  • Quantitative Analysis
    • Data source of values used
    • Define land use categories
    • Show ALL calculations
    • Document ALL selections
use of urban option
Use of Urban Option
  • Questionable Application
    • Light winds
    • Clear skies
    • May not be applicable in sub-tropical conditions
use of urban option1
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
use of terrain data
Use of Terrain Data
  • Document Data Source
  • Do Not Interpolate Data
    • Use value of grid
    • May supplement if grid resolution not sufficient
streamlining review process
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
summary
Summary
  • Use Latest Versions of AERMOD System
  • Follow Guidance on Model Selections
  • Assist in Streamlining Review Process
  • Be a Part of the Solution