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Effect of height and time lag on the estimation of sensible heat flux over a drip-irrigated vineyard using the surface renewal (SR) method across distinct phenological stages

Author

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  • Poblete-Echeverría, Carlos
  • Sepúlveda-Reyes, Daniel
  • Ortega-Farías, Samuel

Abstract

For drip-irrigated vineyards, sensible heat flux (H) is a key parameter to estimate water requirements, when actual evapotranspiration (ETa) is computed as a residual from the surface energy balance. In this regard, a field experiment was carried out to study the effect of measurement height (z) and time lag (r) on the estimation of H over a drip-irrigated vineyard using classical formulation of surface renewal (SR) method. For vineyards, previous studies have indicated that the calibration factor (α) and the accuracy of the SR method depend on z, however the combined effect of z and r on the estimation of H has not been studied in detail for key phenological stages. In this study 12 combinations of 4 time lags (r1=0.2s, r2=0.5s, r3=0.7s and r4=1.0s) and 3 measurement heights (z1=0.5, z2=1.0 and z3=1.5m above canopy) of high-frequency air temperature were evaluated to estimate H using the SR method (HSR) across distinct phenological stages. A three-dimensional sonic anemometer (CSAT3) was used to measure sensible heat (HEC) over the vineyard. Results indicated that the regression analysis between HSR and HEC was highly significant with determination coefficients (r2) between 0.70 and 0.93. Also, α values registered in this study varied from 0.67 to 1.01 for the different combinations and phenological periods. Calibrated HSR computed using z1 and r3 gave the best estimates of HEC in the validation period, with a root mean square error (RMSE) of 52.2Wm−2 and mean absolute error (MAE) of 35.2Wm−2 for all dataset analysis.

Suggested Citation

  • Poblete-Echeverría, Carlos & Sepúlveda-Reyes, Daniel & Ortega-Farías, Samuel, 2014. "Effect of height and time lag on the estimation of sensible heat flux over a drip-irrigated vineyard using the surface renewal (SR) method across distinct phenological stages," Agricultural Water Management, Elsevier, vol. 141(C), pages 74-83.
    • Handle: RePEc:eee:agiwat:v:141:y:2014:i:c:p:74-83
    DOI: 10.1016/j.agwat.2014.04.006
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    References listed on IDEAS

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    1. Zapata, N. & Martinez-Cob, A., 2002. "Evaluation of the surface renewal method to estimate wheat evapotranspiration," Agricultural Water Management, Elsevier, vol. 55(2), pages 141-157, June.
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    Cited by:

    1. Liu, Xiaoyin & Xu, Junzeng & Liu, Boyi & Wang, Weiguang & Li, Yawei, 2019. "A novel model of water-heat coupling for water-saving irrigated rice fields based on water and energy balance: Model formulation and verification," Agricultural Water Management, Elsevier, vol. 223(C), pages 1-1.
    2. Xu, Junzeng & Liu, Xiaoyin & Yang, Shihong & Qi, Zhiming & Wang, Yijiang, 2017. "Modeling rice evapotranspiration under water-saving irrigation by calibrating canopy resistance model parameters in the Penman-Monteith equation," Agricultural Water Management, Elsevier, vol. 182(C), pages 55-66.

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