Table of Contents - The Atmospheric Studies Group at TRC

Section 9: CALPUFF
9.13 Subgrid Scale Coastal Boundary Data File (COASTLN.DAT)
CALPUFF contains an option to treat subgrid scale coastal effects such as the development of a Thermal
Internal Boundary Layer (TIBL) within an individual grid cell. The subgrid scale coastal module is
controlled by the MSGTIBL variable in Input Group 2 of the control file. If MSGTIBL = 1, CALPUFF
will introduce a subgrid scale TIBL along a coastal boundary specified in an external file
(COASTLN.DAT) when appropriate meteorological conditions exist. The COASTLN.DAT file contains
a set of points that serve to define the coastline. Multiple coastlines (up to "MXCOAST", see the
PARAMS.PUF file) are allowed within a single file.
The COASTLN.DAT file is a sequential, formatted data file (see Table 9-44 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 a record indicating the location of the water body relative to the coastline (i.e., left
or right of the line as one travels in the direction of the data points in the file) and a variable number of
records containing the coordinates of each point defining the coastline.
COASTLN.DAT File - Header Record
The header record of the COASTLN.DAT file contain the name, version, and label of the data set, the
UTM zone of the coordinates, and the number of coastlines defined in the file (see Table 9-45). A
sample Fortran read statement for the header record is:
READ(iunit,*)FNAMEC,NCOAST,IUTMCST,VRSCST,LABCST
where the following declaration applies:
CHARACTER*12 FNAMEC,VRSCST,LABCST.
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