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Modeling
Materials Developed for
"Introduction
to Vadose Zone Hydrology & Modeling"
Shortcourse
Link to other Vadose Zone Modeling Software
VLEACH
VLEACH is a one-dimensional, finite difference model for making
preliminary assessments of the effects on ground water from the
leaching of volatile, sorbed contaminants through the vadose zone. The
program models four main processes: liquid-phase advection, solid-phase
sorption, vapor-phase diffusion, and three-phase equilibration. In an
individual run, VLEACH can simulate leaching in a number of distinct
polygons, which may differ in terms of soil properties, recharge rates,
depth of water, or initial conditions. Modeling results in an overall,
area-weighted assessment of ground-water impact (cited from the EPA
website). The original version
can be found at the EPA website:
Link
to EPA's VLEACH website
An updated, more user-friendly version is available here. Simply double click
on the file below and your browser should ask you where you want to save the
file for download.
This version of VLEACH (version
2.2c) has been modified from the EPA version:
1. The input
file is more user friendly
2. The
program now accepts up to 100,000 model cells. Time steps can be as
small
as 0.0001 years. with up to 500 output times.
3. A new
transient profile output file is created to allow for easy plotting in
spreadsheet programs such as Microsoft Excel(tm), or Corel Quattro Pro
(tm).
4.
This version has been compiled for Windows XP (April 2006).
Please use vleach11b.zip for older versions of Windows (maximum of
9,999 model cells).
The files include the following:
 vl22c.exe
(executable code, 300KB)
vlch22c.for
(FORTRAN source code, 28KB)
vleach-input.txt
(sample input file, 3KB)
vleach.prm (sample
output file, 25KB)
vleach.out (sample
output file, 30KB)
vleach.prf (sample
output file, 286KB)
gwimp.dat (sample
output file, 313KB)
soilimp.dat
(sample output file, 15KB)
trnsprof.dat
(sample output file, 83KB)
readme.txt (readme
file, 7KB)
VLEACH.pdf
(EPA's VLEACH manual, 348KB)
This zip-file contains all of
the above (for Windows XP):
vleach22c.zip
(pkzip file, 552KB)
This zip-file contains an older version compiled on Windows'95:
vleach22b.zip
(pkzip file, 142KB)
NEUROMULTISTEP
This is a pedotransfer function program to predict soil water retention
and
unsaturated hydraulic conductivity from basic soil properties (texture, bulk density, etc.). Here, a unique
dataset consisting of about 310 soil water retention and unsaturated
hydraulic conductivity functions is presented, with hydraulic data
obtained using the multi-step outflow method. Using neural network
analysis, soil water retention and hydraulic conductivity
characteristics are predicted from basic soil properties, i.e., sand,
silt, and clay content, bulk density, saturated water content, and
saturated hydraulic conductivity. Because the training data sets consists of soil hydraulic
data that are obtained using the same measurement technique, hydraulic property predictions improved
significantly when
compared to predicted hydraulic functions using the program
Rosetta.
Reference:
Minasny, B., Hopmans, J.W., Harter, T., Eching, S.O., Tuli, A., Denton,
M., 2004. Neural networks prediction of soil hydraulic functions from
multi-step outflow data. Soil Science Society of America Journal 68,
417-429. (pdf
file for personal use only)
Link
to NeuroMultiStep Website
Download Neuro
Multistep
(Contact the Webmaster)
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