(the SBL formulation for F

za) with the urban PBL assumed to be neutral (i.e.,N= 0). For thelateral dispersion in the urban boundary layer, F

yais calculated using the SBL formulation givenby 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 above

ziu, and is assumed to be equal to a smallpositive value below

ziu; i.e.,For plumes below

ziu, the effective reflection surface is set equal to the height of the urbanboundary layer (i.e.,

zieff = ziu). Plumes that rise aboveziu(hes>ziu) are modeled with azieffthat iscalculated from eq. (68) with zim replaced by

ziu. Plume rise in the urban stable boundary layer iscalculated from eqs. (95) - (99) with M2

/Mz taken from eq.(107).Use of this value for M2

/Mzprovides an appropriate near-neutral plume rise formulation that isexpected within the nocturnal urban boundary layer. However, plume height in these conditions

is not allowed to exceed 1.25

ziu.For daytime conditions (

L< 0) in urban areas, AERMOD uses the same formulations as inrural areas (i.e., no urban-related adjustments to boundary layer characteristics).

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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