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Fig. 8. Independent test of new models of air permeability as a function of air-filled porosity, ka(
), for Hjørring subsurface soils (12 samples from 4–5-m depth and 12 samples from 6–7-m depth): (a) log-transformed air permeability at matric potential of –100 cm H2O, log(ka,100), as a function of air-filled porosity, 100 [estimated and regression curves for ka,100 (Eq. [12] with equivalent pore diameter for gas flow = 150 µm and Eq. [13]) are given]; (b) scatterplot comparison of predicted and measured log(ka). Calculated RMSE values by Eq. [2] using log(ka) data are given.
