Tensiometer Data Acquisition System for Hydrologic Studies Requiring High Temporal Resolution
- John W. Nyhan and
- Barry J. Drennon
Commercially available differential pressure transducers, tensiometers, and a data acquisition system were combined to evaluate soil water tension changes with time within two landfill cover designs used for the shallow land burial of waste materials. A typical error for the differential pressure transducers in the voltage-pressure calibration curve was estimated to be 0.14 V at a transducer output of 4 V. Tensiometer data collected simultaneously using the data-acquisition system and a hand-held manual pressure-transducer system agreed well (r2 = 0.994). The utility of the tensiometer data acquisition system to collect field data was demonstrated successfully using reference tensiometers with known hydraulic heads. Diurnal fluctuations in tensiometer data collected in the field are discussed relative to future experiments to be performed with the system. In addition, tensiometers with unknown and variable hydraulic heads were used to determine tensiometer response times of approximately 50 min.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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