I am using discrete feature to represent fracture and have a question about the parameters to use for Darcy and Hagen-Poiseuille equations.
Here is the hypothetical fracture - The fracture is visible on the ground surface for a length of about 800 m and it extends from the ground surface to a depth of 50 m. The fracture gap on the geologic formation is 1 cm. The fracture physical dimension is 800 m long, 50 m deep and 1 cm wide. I am using a vertical face selection for a layer thickness of 50 m to represent it.
There is a Geometry/thickness parameter for both Darcy and Hagen-Poiseuille equations. Based on the feflow book, this parameter seems the thickness in the vertical direction. In the fracture case above, the thickness will be 50 m. Besides, the Hagen equation has a hydraulic aperture parameter. This seems the fracture gap of 1 cm. Is this parameterization correct? On the other hand, the feflow default parameter for the Geometry/thickness parameter is 0.001 m. This looks like a small number similar to the hydraulic aperture in stead of the thickness in the vertical direction.
