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Field Testing of a Soil Corer Air Permeameter (SCAP) in Desert Soils

Department of Hydrology and Water Resources, Univ. of Arizona, Tucson, AZ 85721. B. Nijssen, currently at 3TIER Environmental Forecast Group, Inc., 2001 Sixth Ave., Suite 2100, Seattle, WA 98121

View larger version (10K): [in a new window]   Fig. 1. Air flow lines associated with ex situ and in situ air permeability measurements. Ex situ measurement is made on a stand, as shown.

View larger version (14K): [in a new window]   Fig. 2. Standard soil core sampler with 3-cm-length soil retainer cylinders.

View larger version (20K): [in a new window]   Fig. 3. The soil corer air permeameter (SCAP) attached to a soil core barrel. Top insert: inner SCAP showing air diffuser and rubber O-ring. Bottom insert: underside view of SCAP showing air diffuser and pressure port.

View larger version (19K): [in a new window]   Fig. 4. Illustration of field setup for measuring in situ air permeability using the soil corer air permeameter.

View larger version (48K): [in a new window]   Fig. 5. Photographs of (A) gently pounding soil core barrel into soil, (B) connecting the soil corer air permeameter (SCAP) to the soil core barrel, and (C) connection of the digital instruments to the SCAP.

View larger version (17K): [in a new window]   Fig. 6. Linear relationships of pressure and Darcian flow for in situ air permeability measurements at 10 points along the Anthony transect (Data Set 3). All R2 values exceed 0.999.

View larger version (22K): [in a new window]   Fig. 7. Comparison of air permeability (ka) values obtained using mechanical and digital flow meters for Data Sets 1 and 2 (n = 71).

View larger version (21K): [in a new window]   Fig. 8. Comparison of air permeability (ka) values obtained from an unsealed soil corer and a sealed soil corer for Data Sets 1 and 2 (n = 71).

View larger version (16K): [in a new window]   Fig. 9. In situ vs. ex situ air permeability (ka) measurements for four agricultural soils in Tucson, AZ, for Data Set 3 (n = 40) using the Jalbert and Dane (2003) shape factor.

View larger version (15K): [in a new window]   Fig. 10. Log air permeability (ka) vs. log saturated hydraulic conductivity (Ksat) graphs for ex situ measurements for four agricultural soils and in situ measurements for one alluvial deposit (n = 39).