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Soil Water Evaluation Using a Hydrologic Model and Calibrated Sensor Network

^a NASA–GSFC Hydrologic Sciences Branch, Code 974, Greenbelt, MD 20771 USA
^b USDA–SWRC, 2000 E. Allen Road, Tucson, AZ 85719 USA

View larger version (45K): [in a new window]   Fig. 1 Map of the Walnut Gulch Experimental Watershed showing its geographical location in the state of Arizona

View larger version (13K): [in a new window]   Fig. 2 Calibration curve for electrical resistance sensors . Points represent matched time domain reflectometer and electrical resistance sensor measurements used to derive the calibration curve represented by the solid line

View larger version (23K): [in a new window]   Fig. 3 Scatterplot of predicted Simultaneous Heat and Water model volumetric water content values vs. calibrated electrical resistance sensor volumetric water content measurements at 5- and 15-cm depths under bare soil

View larger version (27K): [in a new window]   Fig. 4 Predicted Simultaneous Heat and Water model volumetric water content values and calibrated electrical resistance sensor volumetric water content measurements at 5- and 15-cm depths under bare soil plotted as an hourly time series (August 1990–July 1991)

View larger version (23K): [in a new window]   Fig. 5 Scatterplot of predicted Simultaneous Heat and Water model volumetric water content values vs. calibrated electrical resistance sensor volumetric water content measurements at 5- and 15-cm depths under creosote cover

View larger version (27K): [in a new window]   Fig. 6 Predicted Simultaneous Heat and Water model volumetric water content values and calibrated electrical resistance sensor volumetric water content measurements at 5- and 15-cm depths under creosote cover plotted as an hourly time series (August 1990–July 1991)