Air Dispersion Modeling: What the heck is it? · 2016. 2. 26. · Air Dispersion Modeling: What the...
Transcript of Air Dispersion Modeling: What the heck is it? · 2016. 2. 26. · Air Dispersion Modeling: What the...
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Air Dispersion Modeling:
What the heck is it?
Jim Haywood
Michigan Department of Environmental
Quality
517 284-6745
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Who will you hear from?
• Jim Haywood
Senior Meteorologist
• Jenifer Dixon
OEA Air Specialist
2
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Webinar Set Up • All lines will be muted
• Questions can be sent to us via the
question/chat box
• We will
record
webinar
and post
online
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Modeling and Permits
You’ve submitted your application form, site
description, technical information, and
regulatory summary….
Did you consider
modeling?
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Modeling and Permits
AQD Permit
Engineers
I agree! I’ll get this over to modeling!
This new process needs
modeling!
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Why Model? • Identify impacts from the construction or
modification of facilities that are seeking a
permit to install/operate air emission
sources.
• AQD Policy and Procedure AQD-22
(March 3, 2015)
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When Model? • You are a major OR minor source
• Emissions submitted do not demonstrate
protection of Air Quality standards
• Examples:
– Poor dispersion
– Close proximity to sensitive groups
– Potential existing problems in the area
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What is modeling
and how is it
done?
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Mission: Determine Impacts
from Emissions
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Measuring Impacts:
Pre-Permit/Construction
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Measuring Post-Permit Impacts:
Where to Locate?
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Monitor Impacts: Coverage
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Monitor Impacts: Coverage
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Can AQ Models Help With
These Problems?
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Air Quality Models are
Computer Simulations of
Pollutants in the Atmosphere
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Virtual Monitors Over Entire
Affected Area
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Predicting Locations &
Magnitude
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Basic Modeling Elements:
Stack Parameters Meteorology
Building Wake Effects Terrain Features
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Stack Parameters
• Emission Rate
• Stack Height
• Temperature
• Stack Diameter
• Flow Rate
• Stack Orientation
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Stack Orientation
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Building Wake Effect
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Building Wake Effect
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Meteorology
• Wind Speed
• Wind Direction
• Temperature
• Precipitation
• Upper Air Data
• Surface Features
• Representativeness
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Meteorology
Representativeness
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Meteorology
Representativeness
LANSING IRON MOUNTAIN
Wind Direction
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Terrain Features
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Terrain Features
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There’s the Devil in the Details…
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Other Considerations…
• Ambient Air
• Receptor spacing
• Fugitive Dust
• Secondary Pollutants
• Background Concentration
• Other Nearby Sources
• Additional Impacts
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Ambient Air: Where Do You
Model? “the portion of the atmosphere, external to buildings, to which
the public has general access”
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Receptor (Virtual Monitors)
Spacing Area Coverage and Spacing Sufficient to Identify the Location and
Magnitude of the Highest Ambient Impact
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Receptor (Virtual Monitors)
Spacing Area Coverage and Spacing Sufficient to Identify the Location and
Magnitude of the Highest Ambient Impact
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Fugitive Dust Modeling
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Secondary Pollutants: O3
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Secondary Pollutants: PM2.5
Reaction Sun
Ammonia
Products of Fuel
Combustion
NOx and SO2
Solvents
Water
Vapor
Indirect Formation
of Particles
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Total Ambient Impact
Total Impact is Your Proposed Process
PLUS
Nearby Sources Background +
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Additional Impacts
Soil Deposition Vegetative Damage
Fogging and Icing Odors
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CREATE AN INPUT FILE FOR THE MODEL
RUN THE MODEL
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Model Predictions Pass:
Permit Process Continues!
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Model Predictions Fail:
Then What?!?!?
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Model Predictions Fail:
Reduced Impact Strategies
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How Accurate Are the Models?
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AERMOD: EPA Preferred
Model
Simulates transport and dispersion from multiple points, area, and volume sources;
Employs hourly sequential meteorological data to estimate concentrations for averaging times ranging from one hour to one year.
Steady state plume dispersion model for assessment of pollutant concentrations from a variety of sources;
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AERMOD SOFTWARE
EPA
$Free
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AERMOD SOFTWARE
Lakes Environmental
$1,599
BEE-LINE
Software
$1,350
Breeze Software
$1,495
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QUESTIONS???
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What’s Coming Up?
Stack Testing: What is it and why is it necessary?
February 24, 2016 at 10:00AM
Air Monitoring: History and Rationale
March 16, 2016 at 10:00AM
Please join us!
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Wrap Up
• Recording
• Materials
• Evaluation
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Michigan Department of
Environmental Quality
800-662-9278
www.michigan.gov/deq
Sign up for email updates
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