EVAPOTRANSPIRAÇÃO REAL DO COQUEIRO - ANÃO DETERMINADA PELO MODELO METRIC PARAMETRIZADO NO SEMIÁRIDO PARAIBANO

Abstract

The objective of this work was to estimate the actual daily evapotranspiration by the parameterized METRIC model (Mapping evapotranspiration at high resolution with internalized calibration) using spectral data from Landsat-8 satellite images and meteorological data, and to compare the ET estimates with the Penman method -Monteith, in an area planted with irrigated dwarf coconut trees in the municipality of Sousa, PB. The ETa was estimated from the density of the latent heat flux, obtained as a residue of the energy balance by the parameterized METRIC model, which includes in its implementation radiometric calibration, computation of reflectance and biophysical variables, radiation balance, heat flux in the soil and parameterized iterative processes to obtain sensible heat. The balance of radiation, soil heat flux and real evapotranspiration estimated by the parameterized METRIC allowed obtaining the influence of seasonality in the seasons of the year and the water condition in the irrigated dwarf coconut crop. The parameterized METRIC was effective in estimating actual daily evapotranspiration in irrigated coconut palm crops during the dry season.