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release.txt
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release.txt
MODFLOW-USG Release Notes
This file describes changes introduced into MODFLOW-USG with each
official release; these changes may substantially affect users. In this
file, packages are referred to by their 3-or 4-character abbreviation.
For information and references related to these packages, see mfusg.txt
("Summary of MODFLOW-USG").
NOTE: Any use of trade, product or firm names is for descriptive purposes
only and does not imply endorsement by the U.S. Government.
o Version 1.5 02/27/2019
MFUSG -- Updated program version and date.
GLO2BASU1 -- DDREFERENCE was not implemented correctly and so the drawdown
reference array was never reset when DDREFERENCE was specified in the
output control file.
GWF2BASU1 -- Fixed DDREFERENCE bug.
GWF2BCF-LPF-U1 -- Fixed horizontal anisotropy rotation equation.
GWF2EVT8U1 -- Adding missing variable to use statement.
GWF2WEL7U1 -- Initialized variable to zero.
UTL7U1 -- Modified UBDSVBU to use correct node number.
Executables -- Compiled using Intel Fortran 2019.2.190
o Version 1.4 10/27/2017
MFUSG -- Updated program version and date. Added calls for the
ETS and DRT Packages. Revised the way flow terms are written
to the budget file for CLN.
GLO2BASU1 -- Added JA symmetry check. Program now terminates
with an error if the user-provided JA is not symmetric.
GWF2BCF-LPF-U1 -- Removed the minimum saturation value. Difficult
problems behave better by allowing saturation to go to zero
and letting the solver handle it. Revised the way CLN-GW flows
are written to the budget file.
GWF2ETS8U1 -- This is the Segmented Evapotranspiration Package
added in this release.
GWF2DRT8U1 -- This is the Drain with Return Flow Package added
in this release.
GWF2WEL7U1 -- Revised the way flow terms are written to the
budget file for CLN.
GWF2DRN7U1 -- Revised the way flow terms are written to the
budget file for CLN.
GWF2RIV7U1 -- Revised the way flow terms are written to the
budget file for CLN.
GWF2GHB7U1 -- Revised the way flow terms are written to the
budget file for CLN.
GWF2FHB7U1 -- Revised the way flow terms are written to the
budget file for CLN.
GWF2LAK7U1 -- Added ability to read bathymetry and stage/volume
tables.
GWF2SFR7U1 -- Corrected an error in saving stream flows to
a compact budget file.
GWF2SUB7U1 -- Corrected errors in the unstructured subsidence
formulation and output.
CLN2BASU1 -- Removed the minimum saturation value. Revised the
way GW-CLN flow terms are written to the CLN budget file.
GLO2SMS-U1 -- Modified the way constant head and inactive cells
are handled at the matrix level. In the present version,
these cells are handled by inserting a 1.0 on the diagonal,
zeroing out the off-diagonal terms, and putting the head
value on the right-hand side.
UTL7U1 -- Added two new subroutines for writing flow terms
to budget files.
PARUTL7 -- Corrected an error that caused list-based parameter
to work incorrectly for structured grids.
GMODULES -- Added a placedholder variable (IATS) that is not
used by the program.
ZONBUDUSG -- Updated to version 1.01. A bug could be
encountered with non-compact budget files, output in the
CSV format, and a changing number of budget types in the
budget file. The program now terminates with an error
if this condition is encountered and recommends use of the
COMPACT BUDGET format.
Executables -- Compiled using Intel Fortran 2017.4.210.
o Version 1.3 12/01/2015
GLO2BASU1 -- Added DDREFERENCE option so that the reference head
used to calculate drawdown can change during the simulation.
GWF2BASU1 -- Removed calls to u1drel8 and replaced with calls to
generalized u1drel array reader. Time information was being
written to the listing file more frequently than necessary
for an unstructured simulation. This was corrected to be
consistent with MODFLOW-2005.
GWF2BCF-LPF-U1 -- Fixed a problem with BCF input that occured
when LAYCON was assigned a value of 2.
GLO2SMSU1 -- Modifed approach for handling matrix terms for
rows with IBOUND <= 0.
DISU2GNCN1 -- In BD routines changed AMAT to AMATFL to allow
for new approach for handling IBOUND <= 0.
GWF2HFBU1 -- Implemented IVC=1 for vertically staggered staggered
grids.
GWF2WELU1 -- Fixed issue for case where wells were assigned to
CLN nodes and structured GWF nodes.
GWF2GHB7U1 -- Changed call to ULSTRDU so that CLN nodes can be
specified.
GWF2RIV7U1 -- Changed call to ULSTRDU so that CLN nodes can be
specified.
GWF2DRN7U1 -- Changed call to ULSTRDU so that CLN nodes can be
specified. Fixed bug related parameters.
GWF2CHD7U1 -- Changed call to ULSTRDU so that CLN nodes can be
specified.
GWF2EVT8U1 -- For unstructured grids, the node number written
to the binary budget file may have been incorrect in some
cases.
GWF2RCH8U1 -- For unstructured grids, the node number written
to the binary budget file may have been incorrect in some
cases.
GWF2FHB7U1 -- Fixed a bug in the writing of FHB flows to the
binary budget file.
GWF2SFR7U1 -- Fixed several issues related to streams in dry
cells and streams in models with only a single layer.
CLN2BASU1 -- Minor changes to unit number handling and filling
of arrays. Fixed bug in assigning conduit node number. Fixed
bug in calculation of conduit height. Fixed bug in saving
of CLN IBOUND to binary file.
PCGU7 -- Added several variable initialization statements.
XMDLIB_2 -- Added some additional write statements for MUTPCG=0.
UTL7U1 -- Removed u1drel8. Generalized u1drel so that it can
read binary files in the same manner as u2drel.
Example problems -- Made a few minor changes to several of the
input files. The results from the simulations are the same,
but, the appearance of some output files is slightly different.
Executables -- Compiled using Intel Fortran 16.0.0.110
Build 20150815
Program version citation --
Panday, Sorab, Langevin, C.D., Niswonger, R.G., Ibaraki,
Motomu, and Hughes, J.D., 2015, MODFLOW-USG version 1.3.00:
An unstructured grid version of MODFLOW for simulating
groundwater flow and tightly coupled processes using a
control volume finite-difference formulation: U.S.
Geological Survey Software Release, 01 December 2015,
http://dx.doi.org/10.5066/F7R20ZFJ
o Version 1.2 03/21/2014
CLN2BASU1 -- Added transient IBOUND option so that CLN nodes can
change between prescribed head, active, and inactive. Added
capability to read CLN input in IA-JA format. Corrected bug in
cell-by-cell flow output for CLN so that flows between CLN nodes
are written in the IA-JA format. Description is provided in the
description of model input and output.
DISU2GNCN1 -- Slight change to method for constructing system of
equations. Fixed bug for case when node used for interpolation
goes dry.
GLO2BASU1 -- Change in method for constructing system of equations.
GLO2SMS-U1 -- Changed method for using PCGU7U1AR routine. Changed
method for deallocating linear solvers.
GMODULES -- Added items to CLN1MODULE.
GWF2BCF-LPF-U1 -- Corrected method for calculating nodal hydraulic
conductivity values when connection hydraulic conductivity values
are specified.
GWF2CHD7U1 -- Fixed bugs related to parameter values and case where
reusing CHDs from previous stress period.
GWF2DRN7U1 -- Fixed bug related to parameter values.
GWF2EVT8U1 -- Fixed bug that may affect structured models with
variable cell sizes.
GWF2GAG7U1 -- Small formatting change.
GWF2GHB7U1 -- Fixed bug related to parameter values.
GWF2RCH8U1 -- Fixed bug that may affect structured models with
variable cell sizes.
GWF2RIV7U1 -- Fixed bug related to parameter values.
MFUSG -- Added call to CLN1RP and changed allocation method for
linear solvers.
OPENSPEC -- Added comment about STREAM ACCESS.
PCGU7 -- Encapsulated all subroutines into the PCGUMODULE.
o Version 1.1 08/23/2013:
CLN2BASU1 -- Renamed some internal variables and changed how the CLN
constant-head budget terms are tabulated.
DISU2GNCB1 -- Minor source formatting changes.
DISU2GNCN1 -- Devised new approach for expanding the system of
equations to include ghost-node connections. New method should
be substantially faster for problems with many ghost nodes. Fixed
case where ghost-node contributing cell starts or becomes inactive.
GLO2SMS-U1 -- Added support for PCGU bgcs option.
GMODULES -- Renamed TMPA variable to FLOWJA and fixed an
initialization issue with this variable.
GWF2BCF-LPF-U1 -- Revised method for calculating constant-head flows.
Constant-head flows are now calculated from FLOWJA array instead
of being recalculated. Constant-head flows are tabulated by cell
face instead of by cell to provide a more accurate budget.
GWF2GHB7U1 -- Fixed the NOPRINT option.
GWF2LAK7U1 -- Fixed several bugs related to lakes and their use with
unstructured grid models.
GWF2SFR7U1 -- Fixed several bugs related to streams and their use
with unstructured grid models.
GWF2STR7U1 -- Added support for auxiliary variables and for reading
free format input files. The 'STREAM FLOW OUT' budget term is now
written in compact form when compact budgets are used.
GWF2WEL7U1 -- Removed inactivation of well package when there are no
active wells.
PCGU7 -- Added the bi-conjugate gradient stabilized acceleration
method for the PCGU linear solver. Changed default pcgu settings
for 'simple', 'moderate', and 'complex'. See input instructions for
additional details.
UTL7U1 -- Small formatting change.
XMD -- Added warning if reduced system (IREDSYS=1) is used.
MFUSG -- Small revisions and change in subroutine calls for tabulating
constant-head budget terms.
SPARSE -- Added new SPARSEMATRIX module to facilitate matrix expansion
for ghost nodes.
o Version 1.0 05/03/2013:
This version is the initial release.