Gaussian plume equation

Pasquill s dispersion parameters were restated in terms of a-y and Cj by Gifford (14, 15) to allow their use in the Gaussian plume equations. The... 

As an example of the use of the Gaussian plume equations using the Pasquill-Gifford dispersion parameters, assume that a source releases 0.37 g s of a pollutant at an effective height of 40 m into the atmosphere with the wind blowing at 2 m s . What is the approximate distance of the maximum concentration, and what is the concentration at this point if the atmosphere is appropriately represented by Pasquill stability class B ... 

This result may also be obtained by starting with Eq. (4.11), assuming a source at z = h and a fictitious source at z = -h, and adding the two expressions in the region 2 > 0. If we assume a totally absorbing earth, the corresponding form of the Gaussian plume equation is... 

Eq. (9.40) reduces to the Gaussian plume equation. Note that the asymptotic condition in Eq. (9.42) corresponds to zh > point source at or near the ground can also be examined. We can take the limit of Eq. (9.39) as h -> 0 using the asymptotic form of... 

The atmospheric dispersion is modeled by a modified Gaussian plume equation which estimates the average dispersion of the contaminants released from the source in each wind direction. The Gaussian model of a plume dispersion accounts for the gaseous contaminant transport from the source area to a downwind receptor and is represented by the equation of Pasquill as modified by Gifford (Chacki, 2000) ... 

We have seen that under certain idealized conditions the mean concentration of a species emitted from a point source has a Gaussian distribution. This fact, although strictly true only in the case of stationary, homogeneous turbulence, serves as the basis for a large class of atmospheric diffusion formulas in common use. The collection of Gaussian-based formulas is sufficiently important in practical application that we devote a portion of this chapter to them. The focus of these formulas is the expression for the mean concentration of a species emitted from a continuous, elevated point source, the so-called Gaussian plume equation. 

Derivation of the Gaussian Plume Equation as a Solution of the Atmospheric Diffusion Equation... 

APPENDIX 18.2 ANALYTICAL PROPERTIES OF THE GAUSSIAN PLUME EQUATION... 

To investigate the properties of the maximum ground-level concentration with respect to distance from the source and windspeed, we begin with the Gaussian plume equation evaluated along the plume centerline (y = 0) at the ground (z = 0) ... 

You have been asked to formulate the problem of determining the best location for a new power plant from the standpoint of minimizing the average yearly exposure of the population to its emissions of SO2. Assume that the long-term average concentration of SO2 downwind of the plant can be fairly accurately represented by the Gaussian plume equation. Let (X Y, Z ) be the location of the source in the (a, z ) coordinate system. Assume that... 

---