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Quantifying Ephemeral Streambed Infiltration from Downhole Temperature Measurements Collected Before and After Streamflow

^a USGS, Water Resources Discipline, 520 North Park Ave. Ste. 221, Tucson, AZ 85719 and University of Arizona, Department of Hydrology and Water Resources, 1133 E. North Campus Dr. Bldg. 11, Tucson, AZ 85721
^b USGS, Water Resources Discipline, 520 North Park Ave., Ste. 221, Tucson, AZ 85719
^c University of Arizona, Department of Hydrology and Water Resources, 1133 E. North Campus Dr. Bldg. 11, Tucson, AZ 85721

View larger version (64K): [in a new window]   Fig. 1. Illustration of 5 by 5 m infiltration area with an access borehole and an adjacent borehole with buried thermocouples.

View larger version (126K): [in a new window]   Fig. 2. Hermetically sealed thermistor encapsulated in glass and a protective plastic shield.

View larger version (16K): [in a new window]   Fig. 3. Paired measurements of the temperature of a water bath and thermistor resistance from 11 calibration experiments performed during a 12-mo period.

View larger version (19K): [in a new window]   Fig. 4. A comparison of temperature profiles measured with downhole thermistor and buried thermocouples. Profiles are labeled with the elapsed time since the beginning of infiltration.

View larger version (29K): [in a new window]   Fig. 5. Comparison of the predicted temperature profile for a constant infiltration rate of 0.34 m d-1 with temperatures measured using a downhole thermistor during the constant flux infiltration experiment. Profiles are labeled with the elapsed time since the beginning of infiltration. The initial temperature profile measured before infiltration is shown for comparison.

View larger version (21K): [in a new window]   Fig. 6. Sensitivity of the RMSE of the modeled temperature profile 114.5 h after the beginning of infiltration to select hydraulic and thermal properties and boundary and initial conditions. The remaining parameters (van Genuchten's n, initial water content, thermal conductivity at full saturation, and residual water content) showed very low sensitivity and are not displayed here.