Air Pollution Dispersion Lab

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Air Pollution Dispersion Lab

• Tim Ellis, Ph.D., P.E.
• CE 326 Principles of Environmental Engineering
• Department of Civil, Construction and
  Environmental Engineering
• Iowa State University
• Spring 2008

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ATMOSPHERIC CONDITIONS WHICH AFFECT AIR POLLUTION

• Wind direction and speed
• Cloud cover ??radiation reaching earth
  ??temperature profile?? turbulence
• Precipitation

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Neutral Stability
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Unstable
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Stable
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Inversion in Los Angeles, CA
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Inversion at Four Corners power plant
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Fig 7-17 Land Breeze during night
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Fig 7-18 Land Breeze during day
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Fig 7-19 Effect of lake breeze on plume
dispersion
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Fig 7-21 Plume dispersion coordinate system
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Fig 7-22 Horizontal dispersion coefficient
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Fig 7-23 Vertical dispersion coefficient
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PLUME RISE
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Fig 7-24 Effect of elevated inversion on
dsipersion
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sz 0.47 ( L - H )
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Building Downwash
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Building Downwash
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Building Downwash
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Building Downwash