Hydraprobe calibration O. Merlin, J. Walker, R. Panciera, H. Meade, D. Biasioni, R. Young, L. Siriwardena, A. Western 3 rd NAFE Workshop 17-18 Sept. 2007.

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Presentation transcript:

Hydraprobe calibration O. Merlin, J. Walker, R. Panciera, H. Meade, D. Biasioni, R. Young, L. Siriwardena, A. Western 3 rd NAFE Workshop Sept. 2007

Objective Derive/validate a calibration equation for: Roving HP measurements (HDAS) Continuous HP measurements (stations)

Hydraprobe (HP) Dielectric sensor at 50MHz of 0-5cm soil Measure real ( ε r -> SM) and imaginary ( ε i -> SAL) dielectric constant (DC) + Temperature Output is 4 voltages: V1, V2, V3 (DC) and V4 (temperature)

Calibration data sets NAFE’06 field measurements: 1 volumetric sample at 5 points in each of the 6 farms, every sampling day + 1 (or more) HP measurement Complementary laboratory experiments – Goulburn soils (Lab’05, Daniele Biasioni) – Yanco soils (Lab’06, Hanna Meade) – Goulburn soils (Temp’06, Rocco Panciera)

Calibration approaches Comparison HP / Grav measurements Two different approaches: – Polynomial interpolation – General (multi-data) equations Account for a range of: – Moisture conditions (linearity) – Soil types (from sand to clay) – Other parameters (temperature, ?) HP Grav

Calibration 1.Direct comparison between HP response (silt) and grav measurements 2.Estimate temperature effect on DC measurements 3.Test different calibration approaches: Polynomial fit Multi-data equations (from measured DC) 4.Apply calibration equations to Roving measurements Station-based HP data

Manufacturer-supplied algo versus grav measurements Saturation of the predicted SM + soil-dependent Linear behaviour of the real DC εrεr SM HP response

Temperature effect Effect of a 15°C increase on the measured DC εrεr εiεi Correction proposed

Application to Y2 Temperature correction Uncorrected DCT-corrected DC

Loss-corrected equation Seyfried et al., 2005 Function of loss tangent Real DC Grav

Comparison of calibration approaches General equation (Seyfried et al., 2005) Loss-corrected equation (Seyfried et al., 2005)

Polynomial fit NAFE’05 Saturation

Intrinsic limitation Moisture content (% v/v) Voltages (% v/v)

Assumptions tan δ ~ tan δ sat T HP ~ T 0-5cm Applicability of the loss-corrected equation and temperature correction to roving measurements

Illustration

Conclusions Seyfrield et al.’s equation validated with NAFE’06 data set Developed a temperature correction for the measured real DC from lab data Calibration applied to the NAFE data sets (about measurements for NAFE’06) The application of this calib to all the new sites (20) in the Murrumbidgee is underway