Comparação de métodos da estimativa da evapotranspiração de referência para o município de Cocal-PI

Abstract

This study aimed to identify the most accurate method to estimate ET0 and evaluate the local profile in relation to ET0 indices in the municipality of Cocal. Six indirect methods were compared with the Penman-Monteith method, the latter being considered as the standard method. To do this, we estimate the daily reference evapotranspiration during a given period (time series between 1990 and 2017) using different empirical methods. These methods consisted of Thornthwaite, Hargraves-Samani, Andrade Júnior, Makkink, Radiação Solar, Camargo which were all compared to the Penman-Monteith FAO-56 standard. The data was obtained from the meteorological station in Parnaíba. After analyzing the data, they presented results tending to the standard method, mainly in the Andrade Júnior method, which is more accurate for the study area, being the most suitable method for the use of evapotranspiration