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Scale Dependence of Soil Permeability to Air: Measurement Method and Field Investigation
Author(s) -
Garbesi Karina,
Sextro Richard G.,
Robinson Allen L.,
Wooley John D.,
Owens Jonathan A.,
Nazaroff William W.
Publication year - 1996
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/95wr03637
Subject(s) - loam , soil water , soil science , air permeability specific surface , environmental science , permeability (electromagnetism) , advection , hydrology (agriculture) , geology , geotechnical engineering , chemistry , biochemistry , physics , organic chemistry , layer (electronics) , membrane , thermodynamics
This work investigates the dependence of soil permeability to air on sampling scale in near‐surface unsaturated soils. A new dual‐probe dynamic pressure technique was developed to measure permeability in situ over different length scales and different spatial orientations in the soil. Soils at three sites were studied using the new technique. Each soil was found to have higher horizontal than vertical permeability. Significant scale dependence of permeability was also observed at each site. Permeability increased by a factor of 20 as sampling scale increased from 0.1 to 2 m in a sand soil vegetated with dry grass, and by a factor of 15 as sampling scale increased from 0.1 to 3.5 m in a sandy loam with mature Coast Live Oak trees ( Quercus agrifolia ). The results indicate that standard methods of permeability assessment can grossly underestimate advective transport of gas phase contaminants through soils.
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