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- Title
Evaluating time domain reflectometry and coaxial impedance sensors for soil observations by the U.S. Climate Reference Network.
- Authors
Wilson, Timothy B.; Diamond, Howard J.; Kochendorfer, John; Meyers, Tilden P.; Hall, Mark; Casey, Nancy W.; Baker, C. Bruce; Leeper, Ronald; Palecki, Michael A.
- Abstract
The objective of this study was to evaluate the performance of two commercial-grade electromagnetic sensors in measuring soil water content for the U.S. Climate Reference Network (USCRN). One sensor was a 50-MHz coaxial impedance dielectric sensor (model HydraProbe, StevensWaterMonitoring Systems). The second sensorwas a 1-GHz time domain reflectometry (TDR) sensor (model TDR-315L, Acclima). There was no substantial difference between both probes in daily mean volumetric soil water content and soil temperature measurements at a 0.1-m depth in a customized uniform loamy soil testbed in Oak Ridge, TN, from 2016 to 2018, and at select USCRN stations with a variety of soils. However, the TDR-315L provided more representative soil water content measurements for stations with high-clay-content soils than the HydraProbe. These results confirm the necessity of using site-specific soil properties for soil sensors like the HydraProbe for estimating soil water content in different soil environments. They also suggest that TDR sensors may provide an opportunity to improve USCRN soil moisture measurements in higher-clay-content soils.
- Subjects
TIME-domain reflectometry; SOIL temperature measurement; SOIL depth; DETECTORS; SOIL moisture
- Publication
Vadose Zone Journal, 2020, Vol 19, Issue 1, p1
- ISSN
1539-1663
- Publication type
Article
- DOI
10.1002/vzj2.20013