EVAPOTRANSPIRACÃO REAL DA BANANA- NANICA DETERMINADA PELO ALGORITMO METRIC NO SEMIÁRIDO DO CEARÁ
DOI:
https://doi.org/10.15809/irriga.2021v26n3p701-716Abstract
The present work aimed to estimate the daily real evapotranspiration (ETr) through the application of the METRIC (Mapping evapotranspiration at high resolution and with internalized calibration) algorithm by means of remote sensing techniques, in an irrigated area cultivated with dwarf cavendish banana in the municipality of Barbalha, CE and to compare the ETr with the one calculated by the Penman-Monteith method. Landsat-8 OLI / TIRS satellite images and meteorological data obtained in an automatic meteorological station were used. After processing the images, the daily estimated ETr’s were determined from the latent heat flux density (LE), obtained as a result of the energy balance equation. The daily evapotranspiration’s in the studied area presented values estimated by the METRIC algorithmic between 5.0 and 6.8 mm day-1, which of them corroborate with the results .found in the bibliography. Comparing the values of ETr estimated by the METRIC in relation to the Penman-Monteith method, low differences were observed, less than 6.0%, which fits as satisfactory and acceptable level of precision, so this is a good tool for the determination of the crop water requirements and in the decisions-making regarding to the use of water resources.
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