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In three-dimensional problems, a redefinition of a parameter inside a REGION causes the parameter to be redefined in all layers of the layer stack above the region.  To cause the parameter to be redefined only in a selected layer, use the LAYER qualifier, as in

 

LAYER number        name = new_expression

LAYER "layer_name"  name = new_expression

 

The LAYER qualifier acts on all subsequent parameter redefinitions, until a new LAYER qualifier or a functionally distinct clause breaks the group of redefinitions.

 

Example:

The following descriptor fragment shows the redefinition of a parameter K in various contexts:

 

DEFINITIONS

 K=1                { defines the default value }

 

BOUNDARIES

LAYER 1 K=2        { (valid only in 3D) defines the value in layer 1 of all regions }

REGION 1

   K=3        { redefines the value in region 1 only, in all layers of a 3D domain }

  LAYER 2 K=4        { (valid only in 3D) defines the value in layer 2 of region 1 only }

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