Rock/Soil Zonation Card Description (HYDT-KE)

The zonation or distribution of rock/soil types across the computational domain is declared via the Rock/Soil Zonation Card. Several options are available through this card for declaring the distribution of rock/soil types: explicit declaration, external files, or IJK Indexing. Explicit declaration is a good choice for simulations involving a limited number of rock/soil types. Under this option the user associates rock/soil type names with portions of the computational domain. Rock/soil names must be unique and contain no more than 64 characters. The following key words have special meanings when used within a rock/soil name: 'skip conv,' 'dp, 'dual porosity,' 'fractured;' where, 'skip conv' is used to skip convergence checks on nodes with associated rock/soil types, and 'dp,' 'dual porosity,' and 'fractured' is used to declare the rock/soil type as having dual porosity characteristics. When explicitly declaring the rock/soil zonations, rock/soil names can be repeatedly applied to a grid cells or domain of grid cells, with only the last definition being applied. For example, to simplify the zonation of a problem with a dominant rock/soil type and isolated pockets or bands of another rock/soil type, the user should initially declare the dominant rock/soil type as covering the entire problem domain. With subsequent input lines, the user can overwrite the original rock/soil type for selected nodes with another rock/soil type. This layering approach is recommended and will often avoid leaving nodes of undeclared rock/soil types. External files can be useful when the rock/soil zonation data are automatically generated (e.g., geologic visualization programs). IJK Indexing should be used when every grid cell is associated with a unique rock/soil type, as common with statistically generated rock/soil distributions. With IJK Indexing the concept of rock/soil types is abandoned for a system where the intrinsic properties of the geologic media are associated with the grid cell. The rock/soil type of a grid cell is extended to boundary surfaces adjacent to the grid cell (i.e., intrinsic properties of the geologic media on boundary surfaces are those of the rock/soil type property or IJK Indexing property descriptions for the node adjacent to the boundary surface). Intrinsic properties for rock/soil types are specified through the Mechanical Properties Card, Hydraulic Properties Card, Thermal Properties Card, Saturation Function Card, Aqueous Relative Permeability Function Card, Gas Relative Permeability Function Card, NAPL Relative Permeability Function Card and Salt Transport Card.