Figure 4. Comparison between granite and tuff at the minimum (0.8 mm) and maximum (3 mm) fracture aperture maximum (δ_f,max).

(a–d) Concentration plots for granite and tuff with varying δ_f,max, shortly after a barometric high pressure period (15 days) and during a barometric low (20 days). (e) Breakthrough curves at the centerline surface node for granite and tuff with δ_f,max of 0.8 and 3 mm and barometric pressure for the first 50 days.