Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Hydraulic conductivity and fracture frequency dependence in granite massifs
Abstract
We evaluated the correlations between number of fractures and hydraulic conductivities in three types of granites in the Bohemian Massif. The evaluation include the Podlesí, Melechov and Lipnice granites. Regardless of the granite type, the correlations have different trends in granites with the conductivities higher respectively lower than 10-8 m.s-1. The correlation between the two parameters is positive and sometimes it is statistically insignificant in granite with the conductivity below 10-8 m.s-1. The correlation is negative in the sections with the conductivity above 10-8 m.s-1. The less fractures are in the sections, the higher probability is that a single fracture with relatively very high conductivity is present. Combined mathematical models are the most suitable tools for groundwater flow simulation in heterogeneous fracture environment. They include equivalent continuum representation of small fractures and discrete fracture network of large conductive fractures or fractures zones.
