A Guide for Using the Transient Ground-Water Flow Model of the Death Valley Regional Ground-Water Flow System, Nevada and California

Open-File Report 2006–1104

U.S. GEOLOGICAL SURVEY
Open-File Report 2006–1104

Table 7. Modes of MODFLOW-2000 produced by activating different combinations of the Sensitivity and Parameter-Estimation Processes, and commonly used output when the Observation Process is active.

[Modified from Hill and others, 2000, p. 12. Abbreviations: OBS, Observation Process; PES, Parameter-Estimation Process; SEN, Sensitivity Process]

Active?			Mode	Commonly used model output	Model output filenames
PES	SEN	OBS	Mode	Commonly used model output	Model output filenames
Forward Mode
YES	NO or YES	YES¹	Forward with Observations and Parameter-Value Substitution	Head contour maps	Depends on print flags
				Water-budget terms	Depends on print flags
				Fit of simulated equivalents to observations	_os, _ww, _ws, _r, _w, and _nm
Parameter-Sensitivity Modes
YES	NO	YES	Parameter Sensitivity with Observations	Fit of simulated equivalents to observations	_os, _ww, _ws, _r, _w, and_nm
				One-percent scaled sensitivity maps (set print flags in SEN file)	GLOBAL file or _s1 (depends on print flags)
				Composite scaled sensitivities	_sc
				Prediction scaled sensitivities	³_s1
YES	YES²	YES	Sensitivity Analysis	Fit of simulated equivalents to observations	_os, _ww, _ws, _r, _w, and _nm
				Composite scaled sensitivities	_sc
				Prediction scaled sensitivities	³_s1
				Parameter 95-percent linear confidence intervals	GLOBAL file
				Parameter standard deviations	GLOBAL file
				Parameter coefficient of standard deviations	GLOBAL file
				Parameter correlation coefficients	GLOBAL file
				Parameter covariance matrix	GLOBAL file
				Calculated error variance	GLOBAL file
				Standard error of the regression	GLOBAL file
Parameter-Estimation Mode
YES	YES	YES	Parameter Estimation	Optimal parameter values or, if optimal values are not achieved, data from parameter-estimation iterations to diagnose problems.	GLOBAL file, _pc, and _pa

¹ISNEALL<0 in the Sensitivity Process input file.

²MAX-ITER=0 in the Parameter-Estimation Process input file.

³One-percent scaled sensitivities in this file are often used as prediction scaled sensitivities. Predictions scaled sensitivities can be calculated from one-percent scaled sensitivities (Hill, 1998, p. 15-17).

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