Transcription of Gaussian Plumes from “Point” Sources
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Gaussian Plumes from “Point” Sources
1 GaussianPlumes from Point Sources Time averaged vs instantaneous Plumes Simplified steady-state plume model Eddy diffusion , advection/ diffusion equation Gaussian point source plume model plume sigma values vs stability and distance plume reflection Non- Gaussian Plumes plume Rise; plume trajectories Buoyancy-induced dispersion Stack downwashView from below of Coning plume under neutral atmospheric conditionsSource: Slade et al Meteorology and Atomic Energy, 1968 instantaneoustime-averaged2 InstantaneousPlume ShapeTime-averaged plume ShapeFig 4-3, in Martin et alwindDescribing plume Concentrations3 Tim s Simple plume Modelhx123mass/timepassingpoint 1=mass/timepassing thrudisk area 2mass/timepassing thrudisk area 3C1 > C2> C3=Simplified Steady-State plume Model*Pollutant is well mixed and confined within the cone*Pollutant is continuously swept thru the cone by the windConcentration vs.
• “Eddy” diffusion, advection/diffusion equation • Gaussian point source plume model • Plume sigma values vs stability and distance • Plume reflection ... wind speed area of disk 2 Mass emission rate Conc at 2 = 1 2 Simple Model #2: x z y X is the time-averaged wind direction, Y is the cross-wind direction, Z is the vertical ...
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