Surface characteristics in the form of albedo, surface roughness and Bowen ratio, plus

standard meteorological observations (wind speed, wind direction, temperature, and cloud

cover), are input to AERMET. AERMET then calculates the PBL parameters: friction velocity

(u*), Monin-Obukhov length (L), convective velocity scale (w*), temperature scale ( 2

*), mixing

height (zi), and surface heat flux (H). These parameters are then passed to the INTERFACE

(which is within AERMOD) where similarity expressions (in conjunction with measurements)

are used to calculate vertical profiles of wind speed (u), lateral and vertical turbulent fluctuations

( F

v, Fw), potential temperature gradient (d2/dz), and potential temperature (2 ).


The AERMIC terrain pre-processor AERMAP uses gridded terrain data to calculate a

representative terrain-influence height (hc), also referred to as the terrain height scale. The

terrain height scale hc, which is uniquely defined for each receptor location, is used to calculate

the dividing streamline height. The gridded data needed by AERMAP is selected from Digital

Elevation Model (DEM) data. AERMAP is also used to create receptor grids. The elevation for

each specified receptor is automatically assigned through AERMAP. For each receptor,

AERMAP passes the following information to AERMOD: the receptor’s location (xr , yr), its

height above mean sea level (zr), and the receptor specific terrain height scale (hc).

A comprehensive description of the basic formulation of the AERMOD dispersion model

including the INTERFACE, AERMET, and AERMAP is presented in this document. Included

are: 1) a complete description of the AERMET algorithms that provide quantitative hourly PBL

parameters; 2) the general form of the concentration equation with adjustments for terrain; 3)

plume rise and dispersion algorithms appropriate for both the convective and stable boundary

layers; 4) handling of boundary layer inhomogeneity; 5) algorithms for developing vertical

profiles of the necessary meteorological parameters; 6) a treatment of the nighttime urban

boundary layer; 7) treatment of building downwash (incorporation of PRIME); and 8)

enhancement of lateral dispersion due to plume meander. The model described here represents

the 04300 versions of AERMOD, AERMET and AERMAP. In addition, all of the symbols used

for the many parameters and variables that are referred to in this document are defined, with

their appropriate units, in the section titled “List of Symbols.”



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


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