Download User Manual of the Multicomponent Variably - PC

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hence for each solution) should be specified for each SOLUTION key word in the
phreeqc.in file. Alternatively, the SOLUTION_SPREAD key word can be used to
define solutions with varying amounts of water and temperatures as a function of
depth.
The input file phreeqc.in must contain the keyword TRANSPORT together with the
option -cells indicating the number of cells. No additional information is required
after the keyword (e.g., dispersivity and molecular diffusion are all defined in the
input files of HYDRUS-1D), although –punch_cells and –punch_frequency
can be used to control the output.
The different input files are most conveniently created using the interactive graphic-based
user interfaces of the original models. These interfaces are public domain and can be
downloaded from the World Wide Web for both the HYDRUS-1D and PHREEQC models.
The HYDRUS-1D model is located at http://www.pc-progress.cz/Fr_Hydrus.htm. The main
part of the input-files required for the water flow, heat and solute transport parts of the
problem can be constructed using the HYDRUS-1D interface (section B of Šimůnek et al.,
1998).
A
graphical
interface
for
PHREEQC
can
be
found
at
or
at
http://www.geo.vu.nl/users/posv/phreeqc/index.html
http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqci/. This interface is helpful for
constructing the phreeqc.in input file for the geochemical reactions in the problem.
3.2 Running the model and output
An extra file, path.dat, must be placed in the same directory as the executable of the HP1
model (i.e., HP1.exe) and two dynamically linked libraries with HYDRUS-1D (i.e.,
Hydrus.dll) and PHREEQC (i.e., Phreeqc.dll) subroutines and functions. The path.dat file
specifies the path to the input and output file folder. All input files should be placed in the
same folder (except the database file for which the path and name is defined in the species.in
file). The simulation is started by activating the executable. Output files are created in the
same folder as the input files. The content of the output files created by HYDRUS-1D are
described in section 11 of Šimůnek et al. (1998). The output file of PHREEQC contains userdefined output data (the SELECTED_OUTPUT key word in the input file, see Parkhurst and
Appelo, 1999). Part of the created output can be viewed through the interfaces.