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Table 4: Template example for a two-dimensional array
comprised of four different numbers
1.2345
1.2345
1.2345
1.2345
1.2345
8.4352
8.4352
8.4352
8.4352
1.2345
1.2345
1.2345
1.2345
1.2345
1.2345
8.4352
8.4352
8.4352
1.2345
1.2345
1.2345
1.2345
1.2345
1.2345
1.2345
8.4352
8.4352
1.2345
1.2345
9.6521
9.6521
9.6521
9.6521
9.6521
9.6521
8.4352
1.2345
1.2345
9.6521
9.6521
9.6521
9.6521
9.6521
9.6521
9.6521
6.7543
6.7543
6.7543
9.6521
9.6521
9.6521
9.6521
9.6521
9.6521
6.7543
6.7543
6.7543
6.7543
9.6521
9.6521
9.6521
9.6521
9.6521
6.7543
6.7543
6.7543
6.7543
6.7543
9.6521
9.6521
9.6521
9.6521
# par1 # # par1 # # par1 # # par1 # # par1 # # par2 # # par2 # # par2 #
# par1 # # par1 # # par1 # # par1 # # par1 # # par2 # # par2 # # par2 #
# par1 # # par1 # # par1 # # par3 # # par3 # # par2 # # par2 # # par2 #
# par1 # # par1 # # par1 # # par3 # # par3 # # par3 # # par2 # # par2 #
# par1 # # par1 # # par1 # # par3 # # par3 # # par3 # # par3 # # par2 #
# par4 # # par1 # # par1 # # par3 # # par3 # # par3 # # par3 # # par3 #
# par4 # # par4 # # par1 # # par3 # # par3 # # par3 # # par3 # # par3 #
# par4 # # par4 # # par4 # # par3 # # par3 # # par3 # # par3 # # par3 #
# par4 # # par4 # # par4 # # par4 # # par3 # # par3 # # par3 # # par3 #
For a spatially distributed parameter occupying a two-dimensional array the model
domain must be subdivided into a handful of zones where the parameter is constant. If
each number in the array is replaced by an appropriate parameter space, the array of
numbers as represented in the model input file becomes an array of parameter spaces.
Each zone of parameter constancy within the array is then identified as having the same
parameter name.
The first part of Table 4 illustrates a two-dimensional array of numbers subdivided into
four zones of equal value. The second part of T able4 shows part of a template file
constructed from it. Before PEST runs the model, it replaces the parameter spaces
found in the template file by the current values pertaining to those parameters, thus
building an array consisting of four separate numbers and defining four separate zones
of parameter constancy
For parameters supplied to MODFLOW or MT3D on a cell-by-cell basis the cells can
be divided into zones of similar value in the same way. For example, Table 5 shows
part of a MODFLOW .DRN file for the Drain Package.
PEST Template Files
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