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A Dynamic Air Permeameter for Coarse-Textured Soil Columns and Cores

Biosyst. Eng. and Environ. Sci., The Univ. of Tennessee, 2506 E. J. Chapman Drive, Knoxville, TN 37996

View larger version (27K): [in a new window]   Fig. 1. Schematic of apparatus to measure and log over time differential pressure (P), volumetric airflow rate (Q), inlet relative humidity (RHin), and outlet relative humidity (RHout).

View larger version (26K): [in a new window]   Fig. 2. Schematic of apparatus to measure volumetric water content () and dry bulk density (db) as a function of location and time. For clarity, the airflow system is not shown.

View larger version (18K): [in a new window]   Fig. 3. Volumetric water content () as a function of time for each of the five measured intervals from the single-layer hand-packed soil column. Air enters on the left side and exits on the right.

View larger version (24K): [in a new window]   Fig. 4. Volumetric airflow rate (Q), differential pressure (P), inlet relative humidity (RHin), and outlet relative humidity (RHout) as a function of time for each of the five measured intervals from the single-layer hand-packed soil column.

View larger version (25K): [in a new window]   Fig. 5. Air permeability (ka) as a function of volumetric water content () for each of the five measured intervals from the single-layer hand-packed soil column.

View larger version (12K): [in a new window]   Fig. 6. Dry bulk density (db) of the single-layer hand-packed soil column.

View larger version (9K): [in a new window]   Fig. 7. Dry air permeability (ka) as a function of dry bulk density (db) from the single-layer hand-packed soil column. Each data point represents the most dense db measurement collected within each air permeability interval.

View larger version (15K): [in a new window]   Fig. 8. Differential pressure (P) as a function of volumetric airflow rate (Q) for each of the five measured intervals from the single-layer hand-packed soil column. The smallest R2 was 0.999, which indicates that Eq. [1] was valid for the range of Q applied during permeability testing.

View larger version (21K): [in a new window]   Fig. 9. Dry air permeability (ka) as a function of volumetric water content () for each of the five measured intervals from a two-layer hand-packed soil column.

View larger version (22K): [in a new window]   Fig. 10. Dry air permeability (ka) as a function of volumetric water content () for each of the five measured intervals from an intact soil core. The pressure sensor for Interval 2 failed during testing.