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Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon

2017; Brazilian Academy of Sciences; Volume: 89; Issue: 3 suppl Linguagem: Inglês

10.1590/0001-3765201720170147

1678-2690

Renato Oliveira da Silva Júnior, Everaldo Barreiros de Souza, Alexandra Lima Tavares, José Aroudo Mota, Douglas Batista da Silva Ferreira, Pedro Walfir Martins e Souza Filho, Edson José Paulino da Rocha,

Environmental and biological studies

This study estimated the reference evapotranspiration rate (ETo) for the Itacaiúnas River Watershed (IRW), Eastern Amazonia, and measured the accuracy of eight empirical equations: Penman-Monteith (PM), Priestley-Taylor (PT), Hargreaves and Samani (HS), Camargo (CAM), Thornthwaite (TH), Hamon (HM), Kharrufa (KF) and Turc (TC) using monthly data from 1980 to 2013. In addition, it verifies the regional applicability to the IRW using a for the Marabá-PA station. The methods TC and PM (FAO56) presented the best results, which demonstrate that radiation and higher temperatures are the dominant drivers in the Evapotranspiration process, while relative humidity and wind speed have a much smaller impact. The temporal and spatial variability of ETo for IRW show has strong seasonality, increasing during the dry season and decreasing during the rainy season. The statistical analyses at 1% level of significance, indicates that there is no correlation of the residuals between the dry and rainy seasons, and test of the physical parameters such as mean temperature, solar radiation and relative air humidity explains the variations of ETo.