hgprieto

Syntax >>> CHARACTERISTIC Parent Command >> OUTPUT   Subcommand –   Description This command generates a file in the format specified by command >>> FORMAT containing the characteristic curves (relative permeability and capillary pressure functions) of all rock types used in the TOUGH2 model. The file name contains the string “_ch”. Example > COMPUTATION >> […]

Syntax >>> WORTH (PARAMETER/PREDICTION) (DETERMINANT/TRACE) (SET) (METRIC: imetric) (PERCENT) Parent Command >> OPTION Subcommand – Description This command makes iTOUGH2 perform a data-worth analysis. The significance of an observation for an inversion (or prediction) is assessed by evaluating how much the parameter uncertainty (keyword PARAMETER) or prediction uncertainty (keyword PREDICTION) is increased when adding potential

Syntax >>> TORNADO (: n_std_dev / BOUNDS) Parent Command >> OPTION Subcommand – Description This command generates a Tornado plot by evaluating the objective function at a reference parameter set (i.e., the initial guess) and at discrete points along each of the parameter axes. By default, two additional points per parameter are evaluated by adding

Syntax >>> STEADY-STATE (SAVE) (: (-)time_step) Parent Command >> OPTION   Subcommand –   Description This command allows TOUGH2 to reach steady state prior to or after a transient simulation. This option can be used to calibrate against steady-state data (only or in combination with transient data), or to reach an equilibrium as initial conditions

Syntax >>> SENSITIVITY SALTELLI/SOBOL Parent Command >> OPTION Subcommand >>>> SAMPLES Description This command performs a global sensitivity analysis using the method proposed by Sobol’ and modified by Saltelli; for details, see Saltelli et al., Global Sensitivity Analysis, The Primer, John Wiley & Sons, Ltd., 2008. Example > COMPUTATION >> OPTION >>> perform a global

Syntax >>> SENSITIVITY MORRIS Parent Command >> OPTION Subcommand >>>> PATH >>>> PARTITION Description This command performs a global sensitivity analysis using the Morris method. The parameter range is partitioned uniformly into a discrete set of values. Starting from a randomly chosen initial set, parameters perturbed one at a time in random order. Multiple random

Syntax >>> SENSITIVITY or >>> DESIGN Parent Command >> OPTION Subcommand – Description This command makes iTOUGH2 evaluate the sensitivity matrix without performing any optimization. By default, the scaled Jacobian matrix, i.e., the sensitivity coefficients scaled by the standard deviation of the observation and expected parameter variation, respectively, is printed to the iTOUGH2 output file:

Syntax >>> SIMPLEX Parent Command >> OPTION Subcommand – Description This command selects the downhill simplex method to minimize the objective function. The downhill simplex method does not calculate derivatives and can therefore be used for discontinuous objective functions. The initial simplex is defined by the initial parameter set p0 and n additional points given

Syntax >>>> TRUNCATE (: (-)trunc) Parent Command >>> SELECT >>> SUPER   Subcommand – Description This command defines one of the criteria used for automatic selection of parameters or superparameters (see Tonkin and Doherty [2005]). The parameter space can be truncated based on the eigenvalues of the Fisher Information matrix. Parameter trunc defines the cut-off

Syntax >>>> SENSITIVITY: (-)rsens Parent Command >>> SELECT   Subcommand – Description This command defines one of the criteria used for automatic parameter selection. It examines the potential of a parameter to reduce the objective function based on the sensitivity coefficient: dD = |delta S|where |delta S| is the change of the objective function if