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The Influence of Hydraulic Nonequilibrium on Pressure Plate Data

^a Hydrology Group, Environmental Technology Division, Pacific Northwest National Laboratory, Richland, WA 99353, USA
^b Decagon Devices, Pullman, WA
^c Washington State University, Pullman, WA

View larger version (48K): [in a new window]   Fig. 1. Methods for measuring water-retention characteristics. Note that no single measurement method spans the full range of matric suctions (after Gee and Ward, 1999).

View larger version (38K): [in a new window]   Fig. 2. Time course of soil water matric suction for sand-equilibrated at 0.03 MPa (0.3 bar) on various pressure plates as indicated for (a), the 5-mm height (sample midpoint) and (b) the soil–plate interface.

View larger version (39K): [in a new window]   Fig. 3. Time course of soil water matric suction for sand equilibrated at 0.5 MPa (5 bar) on various pressure plates as indicated for (a), the 5-mm height (sample midpoint) and (b)the soil–plate interface.

View larger version (40K): [in a new window]   Fig. 4. Time course of soil water matric suction for silt loam equilibrated at 0.03 MPa (0.3 bar) on various pressure plates as indicated for (a), the 5-mm height (sample midpoint) and (b) the soil–plate interface.

View larger version (42K): [in a new window]   Fig. 5. Time course of soil water matric suction for silt loam equilibrated at 0.5 MPa (5 bar) on various pressure plates as indicated for (a), the 5-mm height (sample midpoint) and (b) the soil–plate interface.

View larger version (43K): [in a new window]   Fig. 6. Time course of soil water matric suction for sand equilibrated at 0.03 MPa (0.3 bar) on various thin plates of various conductivities for (a), the 5-mm height (sample midpoint) and (b) the soil–plate interface.

View larger version (43K): [in a new window]   Fig. 7. Time course of soil water matric suction for thin soil sample of sand equilibrated at 0.03 MPa (0.3 bar) on various pressure plates for (a), the 1-mm height (sample midpoint) and (b)the soil–plate interface.