A presente pesquisa objetivou analisar o padrão de distribuição e possíveis tendências da precipitação média e da pluviosidade máxima em 24 horas anual na bacia do rio Pirapó-PR. Essa bacia está localizada no Terceiro Planalto Paranaense, entre as latitudes de 22º 30’ e 23º 30’ Sul e longitudes de 51º15’ e 52º15’ Oeste. Para a realização da pesquisa foram utilizados os totais pluviométricos diários de precipitação do período de 1980 a 2017 de 10 postos pluviométricos do Instituto das Águas do Paraná – SIH. Foi aplicada a estatística descritiva para os dados de pluviosidade dos 10 postos pluviométricos, utilizando-se os respectivos parâmetros: média, desvio padrão e coeficiente de variação. Por meio do teste não paramétrico de Mann-Kendall (1975), verificou-se possíveis tendências nas séries anuais da precipitação média anual e da precipitação máxima em 24 horas. Os resultados mostraram que há um aumento na distribuição da precipitação média anual do baixo para o alto curso da bacia, não sendo observado o mesmo padrão para a pluviosidade máxima diária semelhante. O teste de tendência demonstrou indícios de mudança no comportamento dos valores médios anuais de pluviosidade e máximos diários, porém não significativas.
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).
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