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. Forthe horizontal plume state, the

Ccis given bywhere

Cd,Cr, andCpare 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

zrreplaced byzp.The fraction

fpof the source material that remains trapped in the CBL is found fromwhere )

hh = zi - hs, and )heqis the equilibrium plume rise in a stable environment. The )heqhas the form Berkowicz et al. (1986)

where:

P F uN his the penetration parameter, and the stack buoyancy flux (Fb), ands b h h= 2Δ 3Brunt-Vaisala frequency (

Nh) are given respectively byHere,

uis the wind speed at stack height;gis the gravitational acceleration;ws, rs,, andTsare thestack exit velocity, radius, and temperature, respectively; and 2 is the ambient potential

temperature. The

Nhin eq. (58) is based on the potential temperature gradient in the elevatedstable layer, provided by AERMET, capping the CBL. In general this layer is within

ziandzi+500 m.

n951 - n952 - n953 - n954 - n955 - n956 - n957 - n958 - n959 - n960 - n961 - n962 - n963 - n964 - n965 - n966 - n967 - n968 - n969 - n970 - n971 - n972 - n973 - n974 - n975 - n976 - n977 - n978 - n979 - n980 - n881 - n982 - n983 - n984 - n985 - n986 - n987 - n988 - n989 - n990 - n991 - n992 - n993 - n994 - n995 - n996 - n997 - n998 - n999 - n1000

castellano: DISPER CUSTIC DESCAR RADIA italiano:

castellano: DIS CUS DES RAD english: DIS CUS DES RAD

português: DIS CUS DES RAD italiano: DIS CUS DES RAD