Open-File Report 2006–1104
U.S. GEOLOGICAL SURVEY
Open-File Report 2006–1104
Table 5. Select output files produced by MODFLOW-2000 by active processes.
[Modified from Hill and others, 2000, p. 28. File contents: Observation process: For each observation, the listed items are followed by the variables OBSNAM and PLOT-SYMBOL. File contents: Parameter estimation outputs from MODFLOW-2000, which are inputs for post-processing programs RESAN-2000, BEALE-2000, and YCINT-2000 (Hill and others, 2000) are not included in this table. Abbreviation: SEN, Sensitivity Process]
| Extension | File contents |
|---|---|
| If the Observation Process is active: | |
| _nm | Weighted residuals and probability plotting positions |
| _os | Unweighted simulated equivalents and observations |
| _r | Unweighted residuals |
| _w | Weighted residuals |
| _ww | Weighted simulated equivalents and observations |
| _ws | Weighted simulated equivalents and residuals |
| If the Sensitivity Process also is active, the following files also are produced: | |
| _sc | Composite scaled sensitivity for each parameter, preceded by the PARNAM.1 |
| _sd | Dimensionless scaled sensitivities for each parameter, preceded by OBSNAM2 and PLOT-SYMBOL.3 Repeated for each observation. |
| _s1 | One-percent scaled sensitivities for each parameter, preceded by OBSNAM2 and PLOT-SYMBOL3. Repeated for each observation. |
| If the Parameter-Estimation Process also is active, the following files also are produced: | |
| _b | Information from each parameter-estimation iteration, including parameter values formatted for easy substitution into the Sensitivity Process input file, sum of squared weighted residuals, maximum calculated fractional parameter change and the associated parameter number (as listed in the SEN file), and value of the Marquardt4 parameter. |
| _pa | Parameter values for each parameter-estimation iteration, formatted for easy production of graphs showing parameter values for each iteration. This file is not produced until the end of the program; to access parameter values as each iteration is performed, use the _b file described below. |
| _ss | Sum of squared weighted residuals for each type of observation and prior information and the total; values are listed for all parameter-estimation iterations. |
1PARNAM is a parameter name that is specified in a Ground-Water Flow Process package and the SEN Process.
2OBSNAM are characters used to identify an observation.
3PLOT-SYMBOL is an integer assigned to each observation in an observation input file that is echoed to many output files.
4The Marquardt parameter is used to improve regression for ill-posed problems (Hill, 1998, p. 8-9).
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