HydroGeoSphere/Discrete Fractures

Default discrete fracture transport values

By default, all fracture zones (and elements) in the domain will be assigned default transport properties which are listed in Table 5.22:

Table 5.22: Default Values for Discrete Fracture Transport Properties
Parameter Value Unit
Longitudinal dispersivity ${\displaystyle {\alpha }_{l}}$  1.0 m
Transverse dispersivity ${\displaystyle {\alpha }_{t}}$  0.1 m

The following instructions can be applied to discrete fractures, as discussed in Section 5.8.1, to modify the default transport parameters. For each instruction we will indicate its scope (i.e. .grok, .fprops). Recall that if an instruction is used in the prefix.grok file, it will affect the current set of chosen zones, while in a properties (e.g. .fprops) file, it will only affect the named material of which it is a part.

Longitudinal dispersivity

Scope: .grok .fprops

1. val

Longitudinal dispersivity [L], similar to ${\displaystyle {\alpha }_{l}}$  in Equation 2.97.

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Transverse dispersivity

Scope: .grok .fprops

1. val Transverse dispersivity [L], similar to ${\displaystyle {\alpha }_{t}}$  in Equation 2.97.
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Coupling dispersivity

Scope: .grok .oprops

1. val Dispersivity value [L] to be applied during exchange between the overland flow and subsurface domains.

Default value is 0.0.

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