Table of Contents - The Atmospheric Studies Group at TRC

Section 9: CALPUFF
9.14 Mass Flux Boundary Data File (FLUXBDY.DAT)
When the IMFLX variable in Input Group 5 of the control file is 1, CALPUFF will compute the hourly
mass that crosses boundaries specified in the external file FLUXBDY.DAT. This file contains a set of
points that serve to define one or more boundaries that separate regions. The mass is said to either pass
into or out of a region depending on how the user defines "in" and "out" for each boundary. Multiple
boundaries (up to "MXBNDRY", see the PARAMS.PUF file) are allowed within a single file.
The FLUXBDY.DAT file is a sequential, formatted data file (see Table 9-48 for an example) consisting
of two types of records: a single header record and a variable number of sets of data records. Each set of
data records includes one record that establishes which side of the boundary is considered "in" and
provides a name for the boundary, and a variable number of records containing the coordinates (km) of
each point defining the boundary.
The side of the boundary that is considered "in" may lie either to the left or the right of the boundary as
one travels in the direction of the data points provided in the file. The choice is made by specifying either
IR to indicate that the region to the right is inside, or by specifying IL to indicate that the region to the left
is inside.
FLUXBDY.DAT File - Header Record
The header record of the FLUXBDY.DAT file contains the name, version, and label of the data set, the
UTM zone of the coordinates, and the number of boundaries defined in the file (see Table 9-49). A
sample Fortran read statement for the header record is:
READ(iunit,*)DATATYPE,NBNDRY,IUTMBDY,VRSBDY,LABBDY
where the following declaration applies:
CHARACTER*12 DATATYPE,VRSBDY,LABBDY.
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