Determinação e desempenho de modelos de evapotranspiração de referência no sul do Mato Grosso do Sul

Abstract

The objective of this work was to determine the performance and accuracy of the empirical methods that are based on the absence of solar radiation: Benevides-Lopez, Camargo, Hamon, Hargreaves-Samani, Klarrufa and methods using solar radiation: Jensen-Haise, Makkink , Priestley-Taylor, Solar and Turc, compared to the Penman-Monteith FAO-56 method, in the southern region of Mato Grosso do Sul. The work was carried out using the meteorological data obtained between January 2010 To December of 2015, in the network of stations of the National Institute of Meteorology (INMET) of the municipalities of Amambai, Dourados, Itaquirai, Ivinhema, Juti, Ponta Porã and Sete Quedas. The daily values of the reference evapotranspiration estimate (ETo) were determined in mm day-1 and the mean values of ETo (mm-1), determination coefficient (r2), correlation (R) and standard error estimation (EEP). For the evaluation of the accuracy of the evaluated methods, the agreement index (d) and the performance index (c) were determined. In all municipalities evaluated in the southern region of Mato Grosso do Sul, the best empirical method of estimating ETo to be used was the Priestley-Taylor method. Among the methods that do not use solar radiation, the Hargreaves-Samani method presented the best indexes and can be used in all evaluated sites.