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Published online 4 August 2005
Published in Soil Sci Soc Am J 69:1361-1371 (2005)
DOI: 10.2136/sssaj2004.0332
© 2005 Soil Science Society of America
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Comparison of Air and Water Permeability between Disturbed and Undisturbed Soils

Atac Tulia, Jan W. Hopmansa,*, Dennis E. Rolstona and Per Moldrupb

a Dep. of Land, Air, and Water Resources, Univ. of California, Davis, CA 95616, USA
b Dep. of Environmental Engineering, Aalborg Univ., Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark



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  		Fig. 1. Soil water characteristic curves and independently measured equilibrium water content values for the undisturbed and disturbed soil samples.

 


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  		Fig. 2. Measured water permeability values as a function of volumetric water content for the undisturbed and disturbed soil samples.

 


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  		Fig. 3. Measured air permeability values as a function of volumetric air content for the undisturbed and disturbed soil samples.

 


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  		Fig. 4. Relative permeability of undisturbed and disturbed soil samples as a function of water saturation (Sw = {theta}/{theta}s). kfra and kvra represent the optimized relative air permeability with tortuosity–connectivity parameter from multistep outflow optimization (l1) and from fitting to independently measured air permeability data (l2) using Eq. [5], respectively.

 


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  		Fig. 5. Air and water tortuosity as a function of volumetric air and water content for undisturbed and disturbed soil samples.

 


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  		Fig. 6. Sensitivity of tortuosity ({tau}) on tortuosity–connectivity parameters, l1 and l2 of undisturbed soil samples for (a) water and (b) air phase and of disturbed soil samples for (c) water and (d) air phase, respectively. Shaded areas in each figure represent range of l1 and l2 parameters (Table 3) of water and air phase, respectively, for corresponding undisturbed and disturbed soil samples.

 




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