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Using Soil Freezing Characteristics to Model Multi-Season Soil Water Dynamics

USDA-ARS, Northwest Watershed Research Center, Boise, ID 83712

View larger version (20K): [in a new window]   Fig. 1. (a) Freezing temperatures and (b) associated water potential versus liquid water content for the silt loam Orchard Field Site C. Points of soil moisture curve measured by pressure plate shown for comparison.

View larger version (30K): [in a new window]   Fig. 2. Log-log plot of matric potential versus water content from the Orchard Field Site A (loamy sand), Site B (sandy loam), and Site C (silt loam). Plotted are the matric potential estimated from freezing temperatures for the 5- and 10-cm depths, the resulting best-fit curve for the soil freezing characteristic (SFC), and pressure plate measurements.

View larger version (23K): [in a new window]   Fig. 3. Simulated hourly water contents using soil moisture characteristic (SMC) parameters estimated from the soil freezing characteristic (SFC) and from pressure plate analyses. Plotted are total water content and simulated and measured liquid water content for the sandy loam Orchard Field Site B for the 5-, 10-, and 20-cm depths. The 10-cm soil temperatures are plotted for reference to freeze–thaw cycles.

View larger version (33K): [in a new window]   Fig. 4. Simulated hourly water contents using soil moisture characteristic (SMC) parameters estimated from the soil freezing characteristic (SFC) and from pressure plate analyses. Plotted are total water content and simulated and measured liquid water content for the silt loam Orchard Field Site C for the 5-, 10-, and 20-cm depths. (Legend is same as in Fig. 3.)

View larger version (16K): [in a new window]   Fig. 5. Log-log plot of matric potential versus water content from in situ measurement of the soil freezing characteristic (SFC) at the Lower Sheep site for the 10-cm depth.

View larger version (21K): [in a new window]   Fig. 6. Simulated total water content and simulated and measured hourly liquid water content for the Lower Sheep site for the near-surface, 10-, and 20-cm depths during the freezing period. Measured and simulated 10-cm soil temperatures are plotted for reference to freeze–thaw cycles.

View larger version (18K): [in a new window]   Fig. 7. Log-log plot of matric potential versus water content from in situ measurement of the soil freezing characteristic (SFC) at Pits 1 and 2 of the Boise Front site.

View larger version (16K): [in a new window]   Fig. 8. Simulated and measured hourly liquid water content for the Boise Front site for the 5-, 15-, and 30-cm depths during the nonfreezing period.