Principal Plume Dispersion Models: TVA Power Plants

AMS Workshop on Stability Classification Schemes and Sigma Curves—Summary of Recommendations

“…For an elevated plume undergoing "fumigation" (i.e., rapid downward mixing to the ground) the prefumigation ffy values are probably best estimated from available experience on the behavior of power plant plumes that are emitted high in the nocturnal stable layer and from tall tower wind direction fluctuation data obtained in stable conditions. Direct experience of postfumigation ffy values (Carpenter et al, 1971) has indicated a broadening comparable to the depth of the layer through which the fumigation proceeds.…”

Mathematical Modeling of Air Pollutants: An Application to Indian Urban City

“…Most of the analytical methods for predicting the concentration from stack need the plume rise height   Δh of stack (power plants). There are numerous methods for calculating the plume rise height; in this study it has been calculated, given by Carpenter et al, 1970: ; V s is the stack gas exit velocity, in m/s; d is the stack exit diameter in m; u is the speed at the stack exit in m/s; T s is the stack gas temperature; T a is the environmental temperature and g is the gravitational acceleration, m/s 2 . This method is especially useful because the potential temperature gradient factor is used for adjusting the different stability conditions.…”

Final Review of Safety Assessment Issues at Savannah River Site, August 2011

“…As the name suggests, the Briggs urban parameterization is appropriate for urban environments and includes the influence of increased mechanical turbulence from air flow through building canopies as well as buoyant turbulence during the evening/nighttime hours from the release of stored heat in structures and pavement. The Briggs open country parameterization is appropriate for more rural environments, like SRS, and is based on the combined results of several diffusion experiments (Pasquill [1961], Brookhaven National Laboratory [Smith 1961], and the Tennessee Valley Authority [Carpenter et al 1971]). The Briggs parameterizations are discussed by several authors, including Gifford (1976) and Hanna et al (1982).…”