Scholarlink

<p>Accurate estimates of actual evapotranspiration (ET<sub>a</sub>) are essential for irrigation management in vineyards. This study locally calibrated and validated the Simple Algorithm for Evapotranspiration Retrieving (SAFER) model for California vineyard systems using Landsat 8 imagery and multi-year eddy covariance (EC) measurements collected between 2013 and 2016 in the Central Valley of California. Two calibration approaches were implemented: k-fold cross-validation and a split-sample (two-year) strategy. SAFER performance was evaluated using both closed and unclosed energy balance EC fluxes to assess the influence of energy balance closure on model calibration and validation. Energy balance closure ratios ranged from 0.67 to 0.95, with moderate interannual variability and lower closure observed during some periods. Local calibration of SAFER resulted in regression coefficients that differed substantially from the original parametrization. Compared to the original coefficients, root mean square error (RMSE) was reduced by approximately 71–77%, with values below 0.70&#xa0;mm d<sup>− 1</sup> for both calibration approaches. Model validation showed strong agreement between SAFER ET<sub>a</sub> and EC observations after calibration. RMSE ranged from 0.57 to 0.71&#xa0;mm d<sup>− 1</sup> and mean absolute error (MAE) ranged from 0.46 to 0.55&#xa0;mm d<sup>− 1</sup>. Overall, the results indicate that SAFER provides reliable estimates of daily vineyard ET<sub>a</sub> when locally calibrated, supporting its application for field-scale irrigation management in perennial cropping systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Calibration and validation of the safer evapotranspiration model using Landsat 8 and eddy covariance data in vineyards

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年8月5日

查看全文
  • Anderson L. S. Safre,
  • Alfonso Torres-Rua,
  • Joao Carlos Cury Saad,
  • Antônio Heriberto de Castro Teixeira

摘要

Accurate estimates of actual evapotranspiration (ETa) are essential for irrigation management in vineyards. This study locally calibrated and validated the Simple Algorithm for Evapotranspiration Retrieving (SAFER) model for California vineyard systems using Landsat 8 imagery and multi-year eddy covariance (EC) measurements collected between 2013 and 2016 in the Central Valley of California. Two calibration approaches were implemented: k-fold cross-validation and a split-sample (two-year) strategy. SAFER performance was evaluated using both closed and unclosed energy balance EC fluxes to assess the influence of energy balance closure on model calibration and validation. Energy balance closure ratios ranged from 0.67 to 0.95, with moderate interannual variability and lower closure observed during some periods. Local calibration of SAFER resulted in regression coefficients that differed substantially from the original parametrization. Compared to the original coefficients, root mean square error (RMSE) was reduced by approximately 71–77%, with values below 0.70 mm d− 1 for both calibration approaches. Model validation showed strong agreement between SAFER ETa and EC observations after calibration. RMSE ranged from 0.57 to 0.71 mm d− 1 and mean absolute error (MAE) ranged from 0.46 to 0.55 mm d− 1. Overall, the results indicate that SAFER provides reliable estimates of daily vineyard ETa when locally calibrated, supporting its application for field-scale irrigation management in perennial cropping systems.