the plume and eventual reentrainment into the CBL. Figure 14 illustrates this three plume

approach; a fundamental feature of AERMOD’s convective model. In AERMOD, the total

concentration (Cc) in the CBL is found by summing the contribution from the three sources. For

the horizontal plume state, the Cc is given by

where Cd, Cr, and Cp are the contributions from the direct, indirect and penetrated sources,

respectively. The total concentration for the terrain-following state has the form of eq. (54) but

with zr replaced by zp.

The fraction fp of the source material that remains trapped in the CBL is found from

where )hh = zi - hs, and )heq is the equilibrium plume rise in a stable environment. The )heq

has the form Berkowicz et al. (1986)

where: P F uN h is the penetration parameter, and the stack buoyancy flux (Fb), and s b h h = 2Δ 3

Brunt-Vaisala frequency (Nh) are given respectively by

Here, u is the wind speed at stack height; g is the gravitational acceleration; ws, rs,, and Ts are the

stack exit velocity, radius, and temperature, respectively; and 2 is the ambient potential

temperature. The Nh in eq. (58) is based on the potential temperature gradient in the elevated

stable layer, provided by AERMET, capping the CBL. In general this layer is within zi and zi +

500 m.




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