Hydraulische Modellierung und die Ermittlung des repräsentativen Elementarvolumens (REV) im Kluftgestein

The objective of the following study is the development of a method for the evaluation of the hydraulic conductivity and the representative elementary volume (REV) in fractured rock aquifers, which can be used for the hydraulic modelling of large-scale fractured systems. Two-dimensional stochastic discrete fracture networks were simulated for the evaluation of hydraulic conductivity. Due to the strongly variable fracture density in the considered area, a sensitivity study was performed which examined three various fracture densities according to their hydraulic properties. The flow behaviour in the discrete fracture networks is described with the cubic law. The hydraulic modelling in the fractured rock showed that an REV could not be determined for all discrete fracture networks. With one exception, an REV with a size of 10 m × 10 m could be determined for discrete fracture networks with a medium (P₂₁ = 13.1 m^–1) and high fracture density (P₂₁ = 16.9 m^–1). In contrast, no REV could be found for discrete fracture networks with a low fracture density (P₂₁ = 5.1 m^–1).