iTOUGH2 (inverse TOUGH2) is a computer program
that provides inverse modeling capabilities for the
TOUGH2 code,
a simulator for multiphase, multicomponent, non-isothermal flows in fractured-porous media.
A source-code license for commercial and
academic users is available.
iTOUGH2 solves the inverse problem
by automatically calibrating a TOUGH2 model against observed data.
Any TOUGH2 input parameter can be
estimated based on any observation for which
a corresponding TOUGH2 output can be calculated.
An objective function measures the difference between the
model calculation and the observed data, and a
minimization algorithm proposes new parameter sets that iteratively improve the match.
Once the best estimate parameter set is identified,
iTOUGH2 performs an extensive error analysis which
provides statistical information about residuals, estimation uncertainties,
and the ability to discriminate among model alternatives. Furthermore, an
uncertainty propagation analysis allows one to quantify prediction errors.
iTOUGH2 runs in three application modes:
iTOUGH2 is documented in the following reports:
iTOUGH2 has been applied to synthetic, laboratory and field data
(see examples).
The procedure of inverse modeling using iTOUGH2
is visualized in the flow chart below. Click on a box to obtain additional information.
Page updated: November 10, 2007