Scale Dependence of Soil Permeability to Air: Measurement Method and Field Investigation

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This work investigates the dependence soil air-permeability 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 ... continued below

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51

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Garbesi, K.; Sextro, R.G.; Robinson, Arthur L.; Wooley, J.D.; Owens, J.A. & Nazaroff, W.W. November 1, 1995.

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This work investigates the dependence soil air-permeability 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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51

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  • Journal Name: Water Resources Research; Journal Volume: 32; Journal Issue: 3; Related Information: Journal Publication Date: 3/1/1996

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  • Report No.: LBL-35369
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1009512
  • Archival Resource Key: ark:/67531/metadc831342

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  • November 1, 1995

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • July 5, 2016, 1:44 p.m.

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Garbesi, K.; Sextro, R.G.; Robinson, Arthur L.; Wooley, J.D.; Owens, J.A. & Nazaroff, W.W. Scale Dependence of Soil Permeability to Air: Measurement Method and Field Investigation, article, November 1, 1995; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc831342/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.