Dispersion from Non-point Sources

# Dispersion from Non-point Sources - 9/13/11 Aerosol &...

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Unformatted text preview: 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 11 Line Sources - = 2 2 1 exp 2 2 ) , ( z z H u q x C σ σ π Q: The difference from a point source? If wind direction is normal to the line of emission When the wind is not perpendicular to the line source ) 45 ( sin ) 90 ; , ( ) ; , ( o o x C x C = φ φ φ φ Wind direction Line of emissions ( 29 ( 29 φ φ sin 90 u u = q : source strength per unit distance Examples of line sources? 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 22 Q: Wind at 4 m/s is blowing perpendicular to the highway. Traffic density along the highway is 8000 vehicles per hour with an average vehicle speed of 40 mi/hr. The average vehicle emission rate is 2 10-2 g/s. Estimate the concentration at a point 300 m downwind from the highway at 5:30 pm. 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 33 If the line is short, consider the end effect (F inite L ength L ine S ource ) +- + -- × - × = 2 2 2 2 1 exp 2 1 exp 2 exp 2 z z y y z H z H z y u qdy dC σ σ σ σ πσ ∫- × +- + -- × = 2 1 2 ) 5 . exp( 2 1 exp 2 1 exp 2 ) , ( 2 2 2 p p z z z dp p H z H z u q x C π σ σ σ π y y y p y p σ σ / / 2 2 1 1 = = 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate...
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## This note was uploaded on 09/11/2011 for the course ENV 6146 taught by Professor Staff during the Spring '11 term at University of Florida.

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Dispersion from Non-point Sources - 9/13/11 Aerosol &...

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