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Este artigo discute a relacao entre dados observados de precipitacao de sete estacoes meteorologicas e os dados resultantes de interpolacao realizadas pelo Climate Prediction Center (CPC) para a area da bacia hidrografica do rio Itacaiunas (BHRI), Amazonia Oriental, no periodo de 1986-2005. O trabalho avalia tambem a aplicacao de metodologias expeditas para estimar vazoes medias mensais nas sub bacias, a partir de uma unica estacao de referencia situada em seu exutorio. As vazoes foram estimadas pelos metodos de correcao pela area de drenagem e de padronizacao de vazoes medias comparadas com vazoes medidas (1985-1995) em uma de suas sub bacias. Os resultados obtidos para a precipitacao mostraram-se compativeis com o comportamento sazonal definido para a regiao, cuja correlacao entre os dados observados e os interpolados pelo CPC demonstram que estes representam bem a variabilidade espaco-temporal da precipitacao na BHRI. A analise dos resultados das estacoes meteorologicas mostrou uma tendencia de incremento na precipitacao de leste para oeste, cujo comportamento pode estar associado a densa cobertura florestal que compoe o mosaico de Unidades de Conservacao (UC’s), combinado com altitudes elevadas (600-800 m) da Serra de Carajas. A avaliacao do comportamento das vazoes da unica estacao (Fazenda Alegria) com serie de dados fluviometricos disponiveis apresentou resultados consistentes com o comportamento sazonal das curvas de vazao dentro do ano hidrologico. Os metodos utilizados para a estimativa de vazoes mostraram resultados diferenciados em termos absolutos, porem, as curvas de vazoes estimadas acompanham o comportamento da curva de vazoes medidas na estacao Fazenda Rio Branco. A B S T R A C T This paper discusses the relationship between observed precipitation data from seven meteorological stations and the resulting interpolation data from the Climate Prediction Center (CPC) for the area of the Itacaiunas river basin (BHRI), Eastern Amazonia, in the period 1986-2005. The work also evaluates the application of expeditious methodologies to estimate monthly average flows in the sub basins, from a single reference station located in its exutorio. The flow rates were estimated by the methods of correction by the drainage area and standardization of average flows compared to measured flows (1985-1995) in one of its sub basins. The results obtained for the precipitation were compatible with the seasonal behavior defined for the region, whose correlation between the data observed and those interpolated by the CPC show that they represent well the spatio-temporal variability of the precipitation in the BHRI. The analysis of the results of the meteorological stations showed a tendency of increase in the precipitation from east to west, whose behavior may be associated with dense forest cover that composes the mosaic of Conservation Units (UC's), combined with high altitudes (600-800 m) of the Serra de Carajas. The evaluation of the flow behavior of the single station (Fazenda Alegria) with a series of available fluviometric data presented results consistent with the seasonal behavior of the flow curves within the hydrological year. The methods used for the estimation of flow rates showed different results in absolute terms, however, the estimated flow curves follow the behavior of the measured flow curve in Fazenda Rio Branco station. Keywords: Estimation, precipitation, flow, sub basin, Eastern Amazon

revista brasileira de geografia física

Estimativa de precipitação e vazões médias para a bacia hidrográfica do rio Itacaiúnas (BHRI), Amazônia Oriental, Brasil (Estimation of Precipitation and average Flows for the Itacaiúnas River Watershed (IRW) - Eastern Amazonia, Brazil)