Urban power plant plume studies: Final report

TL;DRAbstract

The behavior of a buoyant plume emitted from a power plant stack located near the center of Indianapolis, Indiana was studied. Emitted sulfur dioxide was measured with a ground-based sensing device and particulate concentrations with an airborne sensing device. Additionally, sulfur hexafluoride (SF/sub 6/) gas was injected into the stack. Coincident ground level SF/sub 6/ concentrations were measured by an array of approximately 175 automated syringe samplers placed on eight to nine arcs downwind of the stack. Contemporaneous continuous measurements of wind velocities and temperature at up to four sites were augmented by frequent radiosonde measurements, humidity, incoming and net radiation, and atmospheric turbulence levels. Using these measurements, three versions of a gaussian model used for regulatory estimates of ground level concentration were evaluated. The findings demonstrated important shortcomings in all the models tested, including a general inability to estimate hour-by-ho

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