Spatial-temporal pluviometry of the Una Basin

Abstract

The Una River Basin holds a diversified rainfall regime. Due to the extension of this Basin, it is inserted in two mesoregions of the Pernambuco state (Zona da Mata and Agreste), which present different climatic patterns. In this context, this research aims to analyze the space-time rainfall behavior in the Una River Basin. This evaluation was carried out through the analysis of homogeneity by the K-Mean algorithm, filling of lacks with the regional vector and spatialization of the average monthly and annual data with the IDW algorithm. According to the monthly rainfall regimen the Cluster K-Mean algorithm coherently determined four clusters in the Una River basin. Regarding the pluviometric lacks, the regional vector method showed good results in the filling of monthly lacks. The double mass curve allowed the perception of consistency of the annual rainfall data. A great variability was observed in the spatialization of the annual total precipitations and of the months considered humid, from which the rainfall decreases in the East-West direction (inversely to the altitude).