Variation of the calculated fractal dimensions with profile number is exemplified in Fig. 2b for the model fractures Fr1, Fr2 and Fr3 presented in Fig. 2a.
In addition to the fractal modelling (Dva), another surface roughness parameter was also calculated as the ratio between total fracture surface area (At) and planar surface area (Ap): At/Ap. The measured values are listed in Table 1 for