Table of Contents - The Atmospheric Studies Group at TRC

Section 9: CALPUFF
Table 9-3 (Continued)
CALPUFF Control File Inputs - Input Group 12
Dispersion and Computational Parameters
Variable Type Description Default Value
SYTDEP real Horizontal size of a puff (m) beyond which the timedependent
dispersion equation of Heffter (1965)
MHFTRZ integer Use Heffter formulas for z (0 = no; 1 = yes). If yes, the
distance at which the Heffter formula will be applied for
z is determined by when y switches to Heffter's eqn.
(see SYTDEP).
JSUP integer Stability class used to determine dispersion rates for puffs
above the boundary layer (e.g., 6 = F stability)
550.
0
5
CONK1 real Vertical dispersion constant for stable conditions 0.01
CONK2 real Vertical dispersion constant for neutral/unstable
conditions
TBD real Factor for determining transition-point from Schulman-
Scire to Huber-Snyder Building Downwash scheme (SS
used for Hs < Hb + TBD * HL)
TBD < 0 always use Huber-Snyder
TBD = 1.5 always use Schulman-Scire
TBD = 0.5 ISC transition-point
0.10
0.5
IURB1,
IURB2
integer Land use categories associated with urban areas. If
10,19
MDISP = 3 or 4, MP dispersion coefficients are used
when puff is over land use type IURB1 through IURB2
(Site characterization parameters for single-point met. data files*)
*ILANDUIN integer Land use category for modeling domain 20
*Z0IN real Roughness length (m) for modeling domain 0.25
*XLAIIN real Leaf area index for modeling domain 3.0
*ELEVIN real Elevation (m) above sea level 0.0
*XLATIN real North Latitude (deg) of station; positive for the northern
hemisphere, negative for the southern hemisphere (used
for solar angle in RIVAD/ARM3 chem. transformation)
-999.
*XLONIN real West Longitude (deg) of station; positive west of 0.0, -999.
negative east of 0.0 (used for solar angle in
RIVAD/ARM3 chem. transformation)
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