Calibração regional e local da equação de Hargreaves para estimativa da evapotranspiração de referência
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Data
2012-06
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Resumo
The FAO-56 Penman-Monteith equation (ETo PM ) has been recommended by the Food and Agriculture Organization
(FAO) of the United Nations as the standard equation for estimating reference evapotranspiration (ETo). The FAO-56 PM
equation requires numerous weather data that are not available in most of the stations of Brazil central. On the other hand, the
Hargreaves equation is a more simple equation for estimating ETo, and demands only maximum and minimum temperature
data. However, this equation requires local calibration. This paper examines the potential of using the Hargreaves equation
adjusted to estimate the ETo in Goiás State. For this, the Hargreaves empiric parameters, HC (empirical Hargreaves coefficient)
and HE (empirical Hargreaves exponent), were adjusted considering two procedures, local adjustment (HGL - Hargreaves local
adjustment) and regional adjustment (HGR - Hargreaves regional adjustment). For HGL, the adjustment of empiric parameters
was done for each weather station. For HGR, the adjustment of empiric parameters was done considering the data set of all
weather stations. The Hargreaves equation adjusted by both processes, local and regional, showed values of 17.95 and 21.93%
for ERQM respectively, considering the full range of climatic data. The Hargreaves equation adjusted by both processes is an
option to estimate the daily values of ETo in Goiás State where there are available data limitation.
Descrição
Palavras-chave
Temperatura atmosférica, Evapotranspiração, Calibração, Atmospheric temperature, Evapotranspiration, Calibration
Citação
FERNANDES, Diego Simões; HEINEMANN, Alexandre Bryan; PAZ, Rosidalva Lopes Feitosa; AMORIM, André de Oliveira. Calibração regional e local da equação de Hargreaves para estimativa da evapotranspiração de referência. Revista Ciência Agronômica, Fortaleza, v. 43, n. 2, p. 246-255, abr./jun. 2012.