Silva Renato O DA, Souza Everaldo B DE, Tavares Alexandra L, Mota José A, Ferreira Douglas B S, Souza-Filho Pedro W M, Rocha Edson J P DA
Programa de Pós-Graduação em Ciências Ambientais, Universidade Federal do Pará, Instituto Geociências, Av. Augusto Correa, 1 Guamá, 66075-110 Belém, PA, Brazil.
Instituto Tecnológico Vale, Rua Boaventura da Silva, 955, Nazaré, 66055-090 Belém, PA, Brazil.
An Acad Bras Cienc. 2017;89(3 Suppl):1985-2002. doi: 10.1590/0001-3765201720170147. Epub 2017 Oct 26.
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.
本研究估算了亚马孙东部伊塔卡尤纳斯河流域（IRW）的参考蒸散速率（ETo），并使用1980年至2013年的月度数据测量了八个经验方程的准确性：彭曼-蒙特斯（PM）、普里斯特利-泰勒（PT）、哈格里夫斯和萨马尼（HS）、卡马戈（CAM）、桑思韦特（TH）、哈蒙（HM）、卡尔鲁法（KF）和图尔克（TC）。此外，它还使用帕拉州马拉巴站的数据验证了这些方程在IRW的区域适用性。图尔克和彭曼-蒙特斯（粮农组织56号）方法得出了最佳结果，这表明辐射和较高温度是蒸散过程中的主要驱动因素，而相对湿度和风速的影响要小得多。IRW的ETo的时空变化具有很强的季节性，在旱季增加，在雨季减少。在1%显著性水平下的统计分析表明，旱季和雨季之间的残差没有相关性，对平均温度、太阳辐射和相对空气湿度等物理参数的检验解释了ETo的变化。
