MODFLOW-NWT - Version: 1.1.3
Newton Formulation for MODFLOW-2005
NOTE: Any use of trade, product or firm names is for descriptive purposes
only and does not imply endorsement by the U.S. Government.
MODFLOW-NWT version 1.1.3 is packaged for personal computers using one of the
Microsoft Windows operating systems. Executable files for personal
computers are provided as well as the source code at the following URL:
http://water.usgs.gov/ogw/modflow-nwt/
The executable files were compiled on a personal computer with the Intel(R)
Core(TM) i7-4702HQ CPU, running the Microsoft Windows 7 Professional
operating system, using the Microsoft Visual Studio 2013 Version 12.0.21005.1
development environment and the Intel® Parallel Studio XE 2017 Update 1 Composer
Edition for Fortran Windows* Integration for Microsoft Visual Studio* 2013,
Version 17.0.0040.12 compiler. The source code is provided to aid users in
compilation on other computers. However, no support is provided for compilation.
IMPORTANT: Users should review the file Summary_MODFLOW-NWT.txt for a description
of, and references for, this software. Users should also review the file
release.txt, which describes changes that have been introduced into MODFLOW-NWT
with each official release; these changes may substantially affect users.
Instructions for installation, execution, and testing of this version of
MODFLOW-NWT are provided below.
TABLE OF CONTENTS
A. DISTRIBUTION FILE
B. INSTALLING
C. EXECUTING THE SOFTWARE
D. TESTING
E. COMPILING
A. DISTRIBUTION FILE
The following distribution file is for use on personal computers:
MODFLOW-NWT_1.1.3.zip
The distribution file contains:
Executables and source code for MODFLOW-NWT.
MODFLOW-NWT documentation.
Eleven MODFLOW-NWT sample problems.
The MODFLOW-NWT program and related files can be extracted from the
distribution file. Extracting these files is all that is required
for installation. It is recommended that the directory structure
in the zip file be maintained when the files are extracted. The
recommended installation directory is C:\WRDAPP. The distribution
file contains the following directory structure.
|
|--MODFLOW-NWT_1.1.3
| |--bin ; Compiled MODFLOW-NWT executables for personal computers
| |--data ; Sample problems
| |--doc ; Documentation report for MODFLOW-NWT and the Surface-
Water Routing Package
| |--output_test ; Output files from running the sample problems
| |--output_test_64 ; Output files from running the sample problems, 64 bit versions
| |--src ; Source code for MODFLOW-NWT
Included in directory MODFLOW-NWT_1.1.3\doc is the MODFLOW-NWT documentation
report, which is a Portable Document Format (PDF) file. The PDF file is
readable and printable on various computer platforms using Acrobat Reader
from Adobe. The Acrobat Reader is freely available from the following World
Wide Web site:
http://www.adobe.com/
B. INSTALLING
To make the executable versions of MODFLOW-NWT accessible from any
directory, the directory containing the executables (MODFLOW-NWT_1.1.3\bin)
should be included in the PATH environment variable.
As an alternative, the executable files, MODFLOW-NWT.exe and MODFLOW-NWT_64.exe,
in the MODFLOW-NWT_1.1.3\bin directory can be copied into a directory already
included in the PATH environment variable.
C. EXECUTING THE SOFTWARE
A 32 bit and a 64 bit executable are provided in the MODFLOW-NWT_1.1.3\bin
directory. Two executables are provided because computers often use either
the 32 bit Windows XP or the 64 bit Windows 7 operating systems. Large
simulations may not run on a 32 bit operating system due to limitations
in the amount of available random access memory (RAM). A 64 bit operating
system provides much more available RAM than a 32 bit operating system.
Thus, it is recommended that a 64 bit executable be used on a 64 bit operating
system for large simulations.
After the executable files in the MODFLOW-NWT_1.1.3\bin directory are installed in
a directory that is included in your PATH, MODFLOW-NWT is initiated in
a Windows Command-Prompt window using the commands:
MODFLOW-NWT.exe [Fname]
or
MODFLOW-NWT_64.exe [Fname]
The optional Fname argument is the name of the MODFLOW-NWT Name File.
The data arrays in MODFLOW-NWT are dynamically allocated, so models are not
limited by hard-coded array limits. However, it is best to have at least
2 MB of RAM available to hold all of the required data. If there is
less available RAM than the model requires, which depends on the size of the
application, the program will use virtual memory; however, this can
slow execution significantly. If there is insufficient RAM to run
the model, then MODFLOW-NWT will not initiate the beginning of the
simulation; however, the Windows Command-Prompt window may continue to
indicate that MODFLOW-NWT is executing. For this circumstance, the program
must be terminated manually using the Windows Task Manager application.
Some of the files written by MODFLOW-NWT are unformatted files. The structure
of these files depends on the compiler and options in the Fortran write
statement. MODFLOW-NWT is compiled with the unformatted file type specified
as "BINARY". Any program that reads the unformatted files produced by
MODFLOW-NWT must be compiled with a compiler that produces programs that
use the same structure for unformatted files. For example, Zonebudget
and Modpath use unformatted budget files produced by MODFLOW-NWT.
Another example are head files that are generated by one MODFLOW-NWT
simulation and used in a following simulation as initial heads. Both
simulations must be run using an executable version of MODFLOW-NWT that uses
the same unformatted file structure.
D. TESTING
Eleven sample problems with MODFLOW-NWT data sets are provided to verify that
MODFLOW-NWT is correctly installed and running on the system. The sample
problems also may be looked at as examples of how to use the program. Five of
the test problems (Pr1a, Pr1b, Pr2, Pr3_lower (32 bit and 64 bit), and
Pr3_higher (32 bit and 64 bit) are documented in Niswonger and others (2011),
one test problems (l1b2k) is documented in Merritt and Konikow (2000) as Test
Simulation 1, one test problem (SwrSample05) is documented in Hughes and others
(2012), and one test problem (swi2ex4sww) is documented in Bakker and others (2013).
A test problem (Sfr2weltab) was added that was modified from the hypothetical test
simulation described by Niswonger and Prudic (2005) to provide an example of specifying
tabular time series input files for pumping rates. Another test problem
(Uzf_testoptions) was added that was modified from test simulation 2 of Niswonger and
others (2006) to provide as example of the new input options for UZF. Another test
problem (SFR_LAK_floodplain) was created that combines the SFR2, LAK7, and UZF1 packages
to demonstrate how the lake package can be used to simulate floodplains adjacent
to streams. These test problems can be run using either the 32-bit or 64-bit
versions of the MODFLOW-NWT executable. Saved results for these simulations are
included in the Output_test and Output_test_64 directories for comparison.
E. COMPILING
The executable files are provided in MODFLOW-NWT_1.1.3\bin. Although executable versions
of the program are provided, the source code also is provided in the MODFLOW-NWT_1.1.3\src
directory so that MODFLOW-NWT can be recompiled if necessary. However, the USGS cannot provide
assistance to those compiling MODFLOW-NWT.
F. REFERENCES
Bakker, Mark, Schaars, Frans, Hughes, J.D., Langevin, C.D., and Dausman, A.M., 2013,
Documentation of the seawater intrusion (SWI2) package for MODFLOW:
U.S. Geological Survey Techniques and Methods, book 6, chap. A46, 47 p. Available online at http://pubs.usgs.gov/tm/6a46/
Hughes, J.D., Langevin, C.D., Chartier, K.L., and White, J.T., 2012, Documentation
of the Surface-Water Routing (SWR1) Process for modeling surface-water flow with the
U.S. Geological Survey Modular Ground-Water Model (MODFLOW-2005): U.S. Geological
Survey Techniques and Methods, book 6, chap. A40 (Version 1.0), 113 p. Available online at http://pubs.usgs.gov/tm/6a40/
Merritt, M.L., and Konikow, K.F., 2000, Documentation of a computer program to simulate
lake-aquifer interaction using the MODFLOW ground-water flow model and the MOC3D
solute-transport model: Water-Resources Investigations Report 00-4167, 146 p. Available online at http://pubs.er.usgs.gov/publication/wri004167
Niswonger, R.G., Panday, Sorab, and Ibaraki, Motomu, 2011, MODFLOW-NWT, A Newton
formulation for MODFLOW-2005: U.S. Geological Survey Techniques and Methods 6-A37, 44 p. Available online at http://pubs.usgs.gov/tm/tm6a37/
Niswonger, R.G., and Prudic, D.E., 2005, Documentation of the Streamflow-Routing (SFR2) Package to include unsaturated flow beneath streams�
A modification to SFR1: U.S. Geological Survey Techniques and Methods 6-A13, 50 p.
Niswonger, R.G., Prudic, D.E., and Regan, R.S., 2006, Documentation of the Unsaturated-Zone Flow (UZF1) Package
for modeling unsaturated flow between the land surface and the water table with MODFLOW-2005: U.S. Geological
Survey Techniques and Methods 6-A19, 62 p