Air Pollution Dispersion LabATMOSPHERIC CONDITIONS WHICH AFFECT AIR POLLUTIONSlide 3Slide 4Slide 5Inversion in Los Angeles, CAInversion at Four Corners power plantSlide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Building DownwashSlide 26Slide 27Slide 28Air Pollution Dispersion LabTim Ellis, Ph.D., P.E.CE 326 Principles of Environmental EngineeringDepartment of Civil, Construction and Environmental EngineeringIowa State UniversitySpring 2008ATMOSPHERIC CONDITIONS WHICH AFFECT AIR POLLUTIONWind direction and speedCloud cover radiation reaching earth temperature profile turbulencePrecipitationNeutral StabilityNeutral StabilityUnstableUnstableStableStableInversion in Los Angeles, CAInversion at Four Corners power plantFig 7-17Fig 7-17: Land Breeze during night: Land Breeze during nightFig 7-18Fig 7-18: Land Breeze during day: Land Breeze during dayFig 7-19Fig 7-19: Effect of lake breeze on plume dispersion: Effect of lake breeze on plume dispersionFig 7-21Fig 7-21: Plume dispersion coordinate system: Plume dispersion coordinate system 22,0,5.0exp5.0expzyxyHxySHSyuSSE 22,0,5.0exp5.0expzyxyHxySHSyuSSEFig 7-22Fig 7-22: Horizontal dispersion coefficient: Horizontal dispersion coefficientFig 7-23Fig 7-23: Vertical dispersion coefficient: Vertical dispersion coefficient894.0axsy894.0axsyfcxsdzfcxsdzPLUME RISEPLUME RISEdTTTpudvHsass))(1068.2(5.12dTTTpudvHsass))(1068.2(5.12Fig 7-24Fig 7-24: Effect of elevated inversion on dsipersion: Effect of elevated inversion on dsipersionsszz = 0.47 ( L - H ) = 0.47 ( L - H )Building DownwashBuilding DownwashBuilding DownwashBuilding
View Full Document
Unlocking...