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A Handheld Device for Intrusive and Nonintrusive Field Measurements of Air Permeability

Marc Jalbert and Jacob H. Dane^*

Department of Agronomy and Soils, Auburn University, AL 36849-5412

View larger version (28K): [in a new window]   Fig. 1. Schematic diagram of permeameter.

View larger version (22K): [in a new window]   Fig. 2. Schematic and dimensions of (a) insertion probe (can probe: D = 95 mm, H = 25 mm), and (b) contact probe (D = 25 mm, D0 = 65 mm).

View larger version (19K): [in a new window]   Fig. 3. Geometric factor for insertion probes as a function of the probe proportion D/H. The solid circles represent Hydrus-2D simulations, while the solid line represents Eq. [4].

View larger version (16K): [in a new window]   Fig. 4. Permeameter characteristic curve (a) for 1.5-VDC pump and (b) for 120-VAC pump.

View larger version (25K): [in a new window]   Fig. 5. Comparison of experimental air permeability values obtained by application of the contact and insertion (can) probe. CS: coarse sand; MS: medium sand; FS: fine sand; VFS: very fine sand; TNH: loam soil, high in organic matter; ALH: sandy loam, high in organic matter; TNL: sandy loam, low organic matter.

View larger version (12K): [in a new window]   Fig. 6. The air flow rate Q as a function of the pressure difference P across a packed sand column (a) using the 1.5-VDC air pump (r2 = 0.984) and (b) using the 120-VAC air pump (r2 = 0.992).