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Probes Calibration

Probes Calibration. Dr. Jeffrey Walker. Daniele Biasioni. THE UNIVERSITY OF MELBOURNE Dept. of Civil and Environmental Engineering. HydraProbe equipment. Field Calibration (tools and method). Soil sampling. HydraProbe. Hydra values (V/V)%. ThetaProbe. Water content (V/V)%.

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Probes Calibration

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  1. Probes Calibration Dr. Jeffrey Walker Daniele Biasioni THE UNIVERSITY OF MELBOURNE Dept. of Civil and Environmental Engineering

  2. HydraProbe equipment Field Calibration (tools and method) Soil sampling

  3. HydraProbe Hydra values (V/V)% ThetaProbe Water content (V/V)% Theta values (mV) Water content (V/V)% Field calibration Rmse = 9,70% Rmse = 9,75 %

  4. Theta values (mV) ThetaProbe Water content (V/V)% Field calibration per team HydraProbe Hydra values (V/V)% Water content (V/V)%

  5. ThetaProbe Theta values (mV) Water content (V/V)% Field calibration per farm HydraProbe Hydra values (V/V)% Water content (V/V)%

  6. Preliminary preparation of soil sample Adding water Laboratory Calibration

  7. Putting the samples in oven Theta Probe testing Hydra Probe testing Laboratory Calibration

  8. Laboratory Calibration Weighing of the sample

  9. HydraProbe (farm calibration) HydraProbe (general calibration) Rmse = 8.9% Rmse = 8.2% Lab calibration T=45º • Sandy soil farms: • Roscommon • Cullingral • ----------------------------------------- • Clayey-soil farms: • Stanley • Merriwa Park • Illogan • Midlothian • Pembroke • Dales Hydra values (V/V)% Water content (V/V)%

  10. Theta values (mV) Water content (V/V)% Lab calibration T=45º ThetaProbe

  11. HydraProbe Hydra values (V/V)% Clayey Soil Water content (V/V)% Sandy Soil ThetaProbe Theta values (mV) Water content (V/V)% Calibration relationships Field calibration trend line

  12. Conclusions • Field calibration of the Hydra probe and the Theta probe was unsatisfactory, due to various errors in the sampling procedure • HydraProbe is highly sensible to the type of soil • ThetaProbe is more stable at extreme values • Further work will include the evaluation of the temperature effect on the response of the probes

  13. Doing 4 measurements around the cylinder and taking the average value Specific vegetation and soil sampling team different sampling equipment Sticking the probe too far from the soil sample Losing soil in the procedure of pushing it out from the cylinder (clayey soil), or extracting it from the ground (sandy soil) Bad soil sample labelling on plastic bags or/and on HydraProbe Swapping of soil sample ID in the drying procedure PROBE SAMPLE Common errors in NAFE ’05 and possible improvements for NAFE ‘06 Errors Improvements

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