Table of Contents - The Atmospheric Studies Group at TRC

Section 9: CALPUFF
BDOWN real Building downwash flag
0. = building downwash not modeled,
1. = building downwash modeled
EMS real array Emission rate of each modeled species
Note: "NSPEC" values must be entered
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-
Table 9-3 (Continued)
CALPUFF Control File Inputs - Input Group 13
Point Source Parameters
Variable Type Description Default Value
(Optional Variables for Input Group 13b)
SIGMAYI real Initial sigma-y (m) associated with the release from this
source
SIGMAZI real Initial sigma-z (m) associated with the release from this
source
FMFAC real is a vertical momentum flux factor (0. or 1.0) used to
represent the effect of rain-caps or other physical
configurations that reduce momentum rise associated with
the actual exit velocity. FMFAC=1 is full momentum (no
obstruction).
0.0
-
0.0
1.0
ZPLTFM real is the platform height (m) for sources influenced by an
0.0
isolated structure that has a significant open area between
the surface and the bulk of the structure
The variables in Input Group 13b are entered for each of the "NPT1" point sources. The data for each
source is treated as a separate input subgroup, and therefore, must end with an input group terminator
(i.e., !END!). Note that the source number is an optional user comment which is outside of the delimiter
containing the required source data. The data for each source must follow an opening delimiter and "X=".
The data for each source is followed by a closing delimiter and an input group terminator.
The first two optional variables may be provided for point sources that have a characteristic distribution
much like volume sources. The values are entered in order between delimiters, following “SIGYZI=”.
The third optional variable is typically used for sources with rain-hats that eliminate the initial vertical
momentum of the release. These records must be placed before the input group terminates (i.e., !END!)
for the point source.
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