Abstract

CASTANEDA-IBANEZ, Carlos Raúl et al. Estimation of evapotranspiration through an energy balance using remote sensors. Ecosistemas y recur. agropecuarios [online]. 2018, vol.5, n.15, pp.537-545. ISSN 2007-901X.  https://doi.org/10.19136/era.a5n15.1647.

Determining evapotranspiration (ET) is an important element in the water use and management process. Mapping Evapotranspiration at high Resolution with Internalized Calibration (METRIC) calculates ET as a residual of the energy balance using satellite images. The objective was to validate the functioning of METRIC to calculate the ET and estimate the efficiency of water use in the Rio Yaqui Irrigation District (ID). Eight Landsat satellite (TM and ETM+ sensors) images and turbulent flow measurements with turbulent covariance towers (Eddy Covariance - EC) were used in a plot with common wheat (Triticum aestivum) cultivation extending throughout the DR. The ET estimated with METRIC and the measurement with EC showed a high degree of correspondence; in the eight images, a root-mean-square error (RMSE) of 0.76 mm d-1 was obtained, along with an absolute mean error (AME) of 0.65 mm d-1, an agreement index (d) of 0.93 and an R2 of 0.83 in the daily estimates. The METRIC methodology is a viable tool to estimate the spatial, temporal variability of ET and the efficiency of water use.

Keywords : Efficiency; evapotranspiration; satellite imagery; METRIC; Triticum aestivum.

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