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Climate 2017, 5(3), 53;

Identification of Homogeneous Rainfall Regions in the Eastern Watersheds of the State of Paraná, Brazil

Department of Geography, University of São Paulo (USP), 338 Prof. Lineu Prestes Avenue, São Paulo 05508-000, Brazil
Authors to whom correspondence should be addressed.
Academic Editors: Valdir Adilson Steinke and Charlei Aparecido da Silva
Received: 19 April 2017 / Revised: 3 July 2017 / Accepted: 6 July 2017 / Published: 15 July 2017
(This article belongs to the Special Issue Studies and Perspectives of Climatology in Brazil)
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The objectives of this study are to use a clustering technique to identify homogeneous rainfall regions in the watersheds of the eastern region of the state of Paraná and to associate the spatial and temporal distribution of rainfall with the influences of orography, the ocean and regional atmospheric dynamics. Rainfall data were obtained from 54 pluviometric stations and from eight meteorological stations, which comprise the historical series from 1976 to 2015. A cluster analysis technique was used with the Euclidean distance for measuring proximity and Ward’s method for hierarchical grouping. The Litorânea watershed exhibited the highest rainfall totals in the study area, and the annual average was 2551 mm for the homogeneous group with the highest rainfall. The Ribeira river watershed exhibited the lowest total rainfall (1488 mm); therefore, it was considered a rain shadow region with a more tropical climate due to the concentration of rainfall in the period from September to March. The Alto Iguaçu watershed was characterized by the smallest spatiotemporal variation in rainfall due to its flatter relief and the influence of the subtropical climate. View Full-Text
Keywords: cluster analysis; oceanic influence; orographic effect cluster analysis; oceanic influence; orographic effect

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Terassi, P.M.B.; Galvani, E. Identification of Homogeneous Rainfall Regions in the Eastern Watersheds of the State of Paraná, Brazil. Climate 2017, 5, 53.

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