(the SBL formulation forFza ) with the urban PBL assumed to be neutral (i.e., N = 0). For the
lateral dispersion in the urban boundary layer,Fya is calculated using the SBL formulation given
by eq. (76).
The potential temperature gradient in the night-time urban boundary layer is set equal to the
upwind rural profile (Section 4.1.3) for all heights aboveziu, and is assumed to be equal to a small
positive value belowziu; i.e.,
For plumes belowziu , the effective reflection surface is set equal to the height of the urban
boundary layer (i.e.,zieff = ziu). Plumes that rise above ziu (hes > ziu) are modeled with a zieff that is
calculated from eq. (68) with zim replaced by ziu. Plume rise in the urban stable boundary layer is
calculated from eqs. (95) - (99) withM2/Mz taken from eq.(107).
Use of this value forM2/Mz provides an appropriate near-neutral plume rise formulation that is
expected within the nocturnal urban boundary layer. However, plume height in these conditions
is not allowed to exceed 1.25ziu.
For daytime conditions (L < 0) in urban areas, AERMOD uses the same formulations as in
rural areas (i.e., no urban-related adjustments to boundary layer characteristics).
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD