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Fig. 3. (a) Gas diffusivity and (b) air permeability of Tachikawa loam and Toyoura sand as a function of air content. The solid and dotted lines in gas diffusivity represent the predicted curves of the Porosity Enhanced (POE) model (Moldrup et al., 2005) against measured data of both soils. The solid and dotted lines in air permeability indicate the approximations of measured data by the soil-water-characteristic-based model (Moldrup et al., 2003a) for both soils. Bars show the standard error of measured data (n = 5).
