Intensidade pluviométrica anual no alto curso do rio Pirapó-PR: uma comparação entre duas propostas metodológicas (Annual rainfall intensity on the upper course of Pirapó River-PR: a comparison between two methodological proposals)

Abstract

A B S T R A C TThis research aims at assessing the rainfall intensity and its correlation with water resource management, as well as the recurrent impacts on the upper course of Pirapó River basin. For carrying out this study, data related to the rainfall from 1980 to 2014, and from 2009 to 2013 were obtained. The information was collected in the weather stations of Apucarana, which belongs to both, the Agronomic Institute of Paraná (IAPAR) and the Meteorological System of Paraná (SIMEPAR), as well as in the station of Maringá, which belongs to the National Institute of Meteorology (INMET). These data were analyzed on an annual scale. The descriptive statistics was applied to the rainfall data of the two municipalities by using the following parameters: mean, standard deviation and coefficient of variation, in addition to the standard year technique proposed by Monteiro (1976). The Manual of Meteorological Observations (INMET, 1999) and Reichardt's proposal (1990) were used as methodology for classifying the rainfall intensity. It was concluded that although Apucarana and Maringá have similar climatic characteristics and are located in the upper course of Pirapó river basin, they show significant differences related to the precipitation variability. Regarding the intensity classification, it was seen that the light intensity class predominates in relation to the moderate and heavy classes. Considering the heavy intensity class, there was a significant difference in the number of occurrences between the two weather stations. Concerning the intensity classification proposed by Reichardt (1990), it was seen that the number of occurrences of light rains was lower than that of the moderate and heavy ones, which are higher in the classification proposed by INMET (1999).