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Modeling the Gas Diffusion Coefficient in Analogy to Electrical Conductivity Using a Capillary Model

^a Dep. Physical Geography and Soil Sci., Univ. of Amsterdam, Nieuwe Prinsengracht 130, 1018 VZ, Amsterdam, The Netherlands
^b National Inst. of Public Health and the Environment, P.O. Box 1, 3720 BA, Bilthoven, The Netherlands

View larger version (14K): [in a new window]   Fig. 1 Measured and fitted relative gas diffusion coefficient (Dp/D0, y-axis) as a function of the volumetric water content (w, x-axis) for the Kootwijk soils. Parameter values of the relative gas diffusion coefficient model are given in Table 2. Soil type is indicated on top of each graph

View larger version (19K): [in a new window]   Fig. 2 Measured and fitted relative gas diffusion coefficient (Dp/D0, y-axis) as a function of the volumetric water content (w, x-axis) for the Harderbos, Eijsden, Belvedere, and Oss soils. Parameter values of the relative gas diffusion coeffient model are given in Table 2. Soil type is indicated on top of each graph

View larger version (14K): [in a new window]   Fig. 3 Measured and predicted relative unsaturated hydraulic conductivity (Kr, y-axis) as a function of the volumetric water content (w, x-axis) for the Kootwijk soils. Soil type is indicated on top of each graph