The DIFS model (1) was developed to investigate and interpet DGT measurements of trace metals
in sediments and soils. By specifying various sediment and DGT parameters, it models the changing
trace metal concentrations in the pore waters and solid phase of the sediment and predicts the response of the DGT device.
In an effort to allow DGT practitioners to use DIFS to interpret measurements from a wide variety of
sediment systems, the model was refined and developed into a software simulation tool (2).
DIFS can be used in either simulation or parameter estimation modes. Its simulations allow users to
give a pictorial appreciation of how concentrations in sediments and soils change in time and space when a sink
such as DGT is introduced. A text file is used to input the parameters. DIFS produces output in the form of
figures and a text file, which can be imported into a spreadsheet such as Microsoft Excel.
Originally written for MATLAB 5.2, DIFS is now available as a 32 bit Windows 95/98/NT program. The MATLAB code was compiled
to C++ using MathsTools' MATCOM 4.
DIFS can be downloaded from the links below:
- DIFS Install (Basic).zip A compressed file containing all the files required to run DIFS
for Windows and sample input (example.dat) and output (example.out) files.
Basic installation puts all the files into one root directory,
thereby duplicating some windows operating files.
- DIFS Install (Advanced).zip A compressed file containing all the files required to run
DIFS for Windows, and sample input (example.dat) and output (example.out) files. Advanced installation packs the files
into different directories and the operating files can then be placed into the correct Windows files.
Only suggested for computer experts!
- Difs_source.zip DIFS Matlab source code. Requires MatLab version 5 or later.
- Difs guide.doc A Word 95 document containing instructions on installing and running DIFS.
Further information, and copies of the two DIFS manuscripts, are available upon request
- Harper, M. P.; Davison, W.; Zhang, H.; Tych, W. (1998) Kinetics of metal
exchange between solids and solutions in sediments and soils interpreted
from DGT measured fluxes. Geochim. Cosmochim. Acta 62, 2757-70)
- Harper, M. P.; Davison, W.; Tych, W. (2000) DIFS - a modelling and simulation
tool for DGT induced trace metal remobilisation in sediments and soils.
Environmental Modelling and Software 15(1), 55-66
2D DIFS
2D_DIFS.zip A compressed file containing all the files required to run 2D-DIFS
for Windows and sample input and output files.
A link to the 2D DIFS manuscript is here:
Sochaczewski L, Tych W, Davison B and Zhang H. 2007.
2D DGT induced fluxes in sediments and soils (2D DIFS).
Environmental Modelling and Software, 22, (1), 14-23.
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