Estimativa da evapotranspiração de referência com ausência de elementos meteorológicos

Abstract

There are several methods of estimating reference evapotranspiration (ETo), those using various meteorological elements and those using few elements, such as those based on air temperature. The objective was to verify the performance of the Hargreaves-Samani method and the Penman Monteith method of estimation of ETo daily in the absence of local data relative humidity, wind speed and solar radiation. Climatic variables obtained through the Stations network of the National Institute of Meteorology were used from January 1, 2017 to December 31, 2017. The data obtained by the stations were maximum and minimum air temperature, maximum and minimum relative humidity air, average wind speed and global solar radiation. The cities of studies were Aquidauana, Bela Vista and Jardim all of the Mato Grosso do Sul State, Brazil. The empirical methods evaluated were the Hargreaves-Samani, Penmam-Monteith methods with local absence of global solar radiation, relative humidity and wind speed. The analysis for the accuracy of the following statistics, the correlation coefficient, the concordance index and the performance index. The recommendation for use occurred when the methods presented "c" indices greater than 0.65. It is concluded that the Hargreaves-Samani, Penmam-Monteith methods with local absence of global solar radiation, relative humidity and wind speed can be used in the cities of Aquidauana, Bela Vista and Jardim.