Command Index

Syntax >>> EMPIRICAL ORTHOGONAL FUNCTIONS (MATRIX: ndim) (iTOUGH2) (CORRELATION) Parent Command >> ERROR Subcommand – Description This command must be used in combination with command >>> MONTE CARLO to invoke stochastic simulations of correlated parameters using Empirical Orthogonal Functions (EOF). EOF is a variant of Monte Carlo simulations to quantify the uncertainty of model predictions […]

Syntax >>> ALPHA: alpha (%) Parent Command >> ERROR Subcommand – Description alpha is a probability used for a variety of statistical tests within iTOUGH2. The choice of alpha does not affect the estimated parameter set, but is used in the residual analysis, the Fisher model test, the analysis of the resulting distribution when performing

Syntax >> ERROR Parent Command > COMPUTATION Subcommand >>> ALPHA >>> EMPIRICAL ORTHOGONAL FUNCTIONS >>> EOF >>> FISHER >>> FOSM >>> HESSIAN >>> LINEARITY >>> LIST >>> MONTE CARLO >>> POSTERIORI >>> PRIORI >>> TAU Description This is the parent command of a number of subcommands that deal with the a posteriori error analysis or

Syntax >>> WARNING Parent Command >> CONVERGE   Subcommand –   Description iTOUGH2 checks the consistency of the TOUGH2 and iTOUGH2 input, printing error and warning messages to the iTOUGH2 output file. The program stops if an error or warning is encountered. Command >>> WARNING makes iTOUGH2 continue despite the occurrence of a warning message.

Syntax >>> UPHILL: max_uphill Parent Command >> CONVERGE Subcommand – Description By default, an inversion is stopped if more than 10 consecutive unsuccessful parameter steps have been proposed. The default can be overwritten by max_uphill. Each unsuccessful step results in an increase of the Levenberg parameter (see command >>> LEVENBERG), leading to a smaller step

Syntax >>> STEP (UNSCALED): max_step Parent Command >> CONVERGENCE   Subcommand – Description This command defines the maximum allowable size of the scaled (fi = σpi, default; fi = pi; keyword CURRENT) or unscaled (fi = 1, keyword UNSCALED) update vector Δp per iTOUGH2 iteration. The step length of the scaled parameter update vector is

Syntax >>> SIMULATION: mtough2 Parent Command >> CONVERGE   Subcommand –   Description This command limits the number of TOUGH2 simulations performed during an inversion. A rough estimate of the total number of TOUGH2 simulations during an inversion can be made given the number of iterations requested (see command >>> ITERATION) and the type of

Syntax >>> SIGNAL Parent Command >> STOP Subcommand – Description This command bypasses the signal handler that intercepts signals sent by the user (ctrl-C on a PC, or those sent by script kit on unix systems). Bypassing the signal handler may be needed to debug the code, so that events throwing a signal can be

Syntax >>> REDUCTION: max_red Parent Command >> CONVERGE   Subcommand –   Description By default, a TOUGH2 simulation stops if 20 consecutive time step reductions have occurred without convergence. This command changes the maximum number of allowable time step reductions to max_red. Time step reductions occur if: (1) the initial time step is too large

Syntax >>> MARQUARDT: nue Parent Command >> CONVERGE Subcommand – Description This command sets the Marquardt parameter nue (default: 10.0). During the optimization process, the Levenberg parameter lambda (see command >>> LEVENBERG) will be divided by the Marquardt parameter nue after each successful iteration, and it will be multiplied by nue if the new parameter