Manual Page for Command >> REGION


Syntax
>> REGION (SINK/SOURCE, PERMEABILITY, OBSERVATION)

Parent Command
> PARAMETER

Subcommand
>>> MATERIAL (if keyword PERMEABILITY)
>>> MODEL
(if keyword OBSERVATION)
>>> SOURCE
(if keyword SINK/SOURCE)

Description
This command selects as a parameter the location and size of a region, in which either properties (i.e., permeability and porosity), a sink or source is provided, or observations are taken (for monitoring system design) are provided (see iTOUGH2 Command Reference, Appendix A4.3 for specifying a property region, and Appendix A11.4 for specifying an injection or production region). The specific geometric parameter XREGION(i) (see Appendices A4.3 and A11.4) is identified by command >>>> INDEX: i. Its meaning depends on the region geometry as defined by parameter IREGGEOM.

IREGGEOM i=1i=2i=3i=4i=5i=6i=7
1 (box) X-minY-minZ-minX-maxY-maxZ-max-
2 (ellispoid X-centerY-centerZ-centerX-semiaxisY-semiaxisZ-semiaxis-
3 (cylinder) X-startY-startZ-startX-endY-endZ-endRadius
4 (cube) X-centerY-centerZ-centerX-halflengthY-halflengthZ-halflength-

If i is negative, the estimated parameter is added to the initial values of the parameters; this feature is useful, for example, to shift multiple wells or discrete fault zones described by permeability regions.

If keyword OBSERVATION is present, the parameter refers to the region where observations are taken. Making the location of a potential measurement and adjustable parameter may be useful for assessing the impact of measurement location uncertainty and for optimal monitoring system design. If this option is used, the annotation of the parameter has to be exactly the same as that of the corresponding data set in the >> OBSERVATION block. Moreover, the observation location may not be defined by a list of elements or connections, but by providing the corrdinates of the region.

Example
> PARAMETER
>> cylindrical SOURCE REGIONs
>>> SOURCE: XYZ_1 +9
>>>> ANNOTATION: shift all wells N-S
>>>> INDEX : -2 -5
>>>> VALUE
>>>> GUESS : 10.0 [m]
>>>> RANGE : -50.0 50.0
<<<<
<<<

>> OBSERVATION REGION
>>> MODEL
>>>> ANNOTATION: concentration
>>>> INDEX : -3 (sampling depth)
>>>> VALUE
>>>> RANGE : -30 -20
<<<<
<<<
<<

> OBSREVATION
>> CONCENTRATION
>>> ELEMENT CUBE COORDINATES: 20. 45. -25. .5 .5 2.
>>>> ANNOTATION: concentration
>>>> NO DATA
>>>> DEVIATION: 1.0E-6
<<<<
<<<
<<

See Also
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Page updated: December 16, 2009