How to determine hydraulic, mechanical and chemical apertures of natural fractures?

Philipp Blum1, Sina Hale1, Tobias Kling1 and Frank Wendler2, (1)Karlsruhe Institute of Technology (KIT), Institute of Applied Geosciences (AGW), Karlsruhe, Germany, (2)University of Erlangen-Nuremberg, Institute of Materials Simulation, Fürth, Germany