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Multiple-Year Water Balance of Soil Covers in a Semiarid Setting

Pacific Northwest National Laboratory, Richland, WA 99354

View larger version (134K): [in a new window]   Fig. 1. Artistic rendering of the Field Lysimeter Test Facility (FLTF) at the Hanford Site.

View larger version (110K): [in a new window]   Fig. 2. Hanford Barrier (HB) layering sequence within a drainage lysimeter (adapted from Fig. 1 of Fayer et al., 1992).

View larger version (44K): [in a new window]   Fig. 3. Water content changes in the silt loam layer of two Hanford Barrier (HB) lysimeters: (a) D4 (ambient precipitation, deep-rooted plants) and (b) D10 (enhanced precipitation, no plants).

View larger version (20K): [in a new window]   Fig. 4. Water storage changes in the silt loam layer of two Hanford Barrier (HB) drainage lysimeters: W1 (ambient precipitation, deep-rooted plants) and W4 (enhanced precipitation, no plants).

View larger version (32K): [in a new window]   Fig. 5. Soil matric head changes at the 1.5-m depth in three Hanford Barrier (HB) and two Hanford Barrier erosion–dune sand deposition (HB–dune sand) lysimeters, which received enhanced precipitation since November 1990. The HB lysimeters had no plants; the HB–dune sand lysimeters had shallow-rooted plants, but deep-rooted plants invaded lysimeter D12 for a short period during 1999.

View larger version (19K): [in a new window]   Fig. 6. Cumulative drainage from three Hanford Barrier (HB) and two Hanford Barrier erosion–dune sand deposition (HB–dune sand) lysimeters, which received enhanced precipitation since November 1990. The HB lysimeters had no plants; the HB–dune sand lysimeters had shallow-rooted plants, but deep-rooted plants invaded lysimeter D12 for a short period during 1999.

View larger version (21K): [in a new window]   Fig. 7. Year-to-year variations in apparent vapor-induced drainage during late-summer to fall under various test conditions. AP, ambient precipitation; EP, enhanced precipitation; NV, no vegetation; SRV, shallow-rooted vegetation; DRV, deep-rooted vegetation.