Air Pollution Dispersion Lab

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Presentation transcript:

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

ATMOSPHERIC CONDITIONS WHICH AFFECT AIR POLLUTION Wind direction and speed Cloud cover radiation reaching earth temperature profile turbulence Precipitation

Neutral Stability

Unstable

Stable

Inversion in Los Angeles, CA

Inversion at Four Corners power plant

Fig 7-17: Land Breeze during night

Fig 7-18: Land Breeze during day

Fig 7-19: Effect of lake breeze on plume dispersion

Fig 7-21: Plume dispersion coordinate system

Fig 7-22: Horizontal dispersion coefficient

Fig 7-23: Vertical dispersion coefficient

PLUME RISE

Fig 7-24: Effect of elevated inversion on dsipersion

sz = 0.47 ( L - H )

Building Downwash

Building Downwash

Building Downwash

Building Downwash

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