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Comprehensive Measurement of Evaporation in Sprinkler Irrigation Systems

Explore a novel technique to accurately measure total evaporation and its components during sprinkler irrigation. Learn about the methodology, results, and conclusions of the study, including overcoming limitations of traditional measurement methods.

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Comprehensive Measurement of Evaporation in Sprinkler Irrigation Systems

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  1. 2012 IAL Conference Jasim Uddin Rod Smith Nigel Hancock Joseph Foley National Centre for Engineering In Agriculture (NCEA) University of Southern Queensland, Toowoomba QLD 4350 Australia A novel technique to measure the total evaporation and its components during sprinkler irrigation

  2. Presentation layout • Background • Hypothesis • Objectives • Methodology • Results • Conclusions

  3. Background Figure 1: Components of evaporation losses during sprinkler irrigation Droplet evaporation Canopy evaporation Soil evaporation

  4. Background

  5. Limitations of the catch-can method • Laborious and time consuming • Unable to measure ET over crop (Source : Smith, Cotton CRC) Catch-can

  6. Limitations of the lysimeter method Figure 3: Measured ET using lysimeter and predicted ET (source : Thompson et al. 1997) Irrigation period Lysimeter could not measure ET during irrigation

  7. Background Hypothesis: Eddy covariance – sap flow method can be used to measure total ET and its components during sprinkler irrigation Objectives: • To measure the total ET and transpiration • To estimate the components of ET

  8. Methodology Figure 4: Experimental set up Eddy covariance system Sap flow system

  9. Methodology Eddy covariance (ECV) system Infrared Gas analyzer Sonic anemometer Net radiometer

  10. Sap flow system Datalogger Hub sensor Interface

  11. Methodology Measurements • Latent heat flux (λE) and sensible heat flux (H) Eddy covariance technique • Net radiation (Rn) Four components net radiometer • Soil heat flux (G) Soil heat flux plates • Transpiration (T) measured by Sap flow method • Air temperature (Ta) and Relative humidity (RH) Temperature and RH probe

  12. Methodology Data processing • Calculation of λE: Bowen Ratio, • Calculations of ET in mm/hr : • Calculations of ETref: FAO Penman-Monteith

  13. Results Figure 3: Measurement of ET and tarnspiration over mature cotton

  14. Results Figure 4: Components of total ET measured by ECV-sap flow method

  15. Conclusions Measurement of total ET during sprinkler irrigation is possible which includes: • canopy evaporation and droplet evaporation during irrigation • reduction of transpiration during irrigation • canopy interception • soil evaporation

  16. Thanks for your attendanceQuestions

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