Rainfall characterization in the southern portion of the IX Hydrographic Region of the state of Rio de Janeiro

Authors

DOI:

https://doi.org/10.19180/2177-4560.v19n22025p138-149

Keywords:

Extremos de Precipitação, Índices Climáticos, Análise de tendência, Rio Carucango, Cachoeira da Amorosa

Abstract

This study aims to analyze the rainfall characteristics in the southern portion of Hydrographic Region IX (State of Rio de Janeiro) with a focus on the Imbé and Macabu watersheds. For this purpose, daily precipitation data from the meteorological station of the National Water and Sanitation Agency (ANA), located in Trajano de Morais/RJ, from January 1990 to June 2024 were used. In the comparative analysis, data from September 2023 to February 2024 were used from the simplified station located in the Águas Claras I and II Private Natural Heritage Reserves’ headquarter, in Conceição de Macabu/RJ. With the data from the ANA station, five climate indices based on precipitation data were applied. To detect statistically significant trends, the nonparametric Mann-Kendall statistical test was used. The magnitude of the trends was obtained by the Sen estimator. The results indicate that although the stations present similar rainfall characteristics in some aspects, there are differences in the intensity and distribution of rainfall. In the trend analysis of the climate indices of the data from the ANA station, in general, an increase in precipitation was observed in the Imbé river watershed region.

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Author Biographies

  • Gildo Rafael de Almeida Santana, Instituto Federal Fluminense
    Doutorando em Modelagem e Tecnologia para Meio Ambiente Aplicadas em Recursos Hídricos. Mestre em Engenharia Ambiental pelo Instituto Federal Fluminense.
  • Maria Inês Paes Ferreira, Instituto Federal Fluminense
    Doutorado em Ciência e Tecnologia de Polímeros pela Universidade Federal do Rio de Janeiro. Professora no Instituto Federal Fluminense.
  • Elias Fernandes de Sousa, Universidade Estadual do Norte Fluminense
    Doutorado em Produção Vegetal pela Universidade Estadual do Norte Fluminense Darcy Ribeiro.Professor Titular da Universidade Estadual do Norte Fluminense Darcy Ribeiro.
  • Rose Angela Hilda Wanzeler Braga, Instituto Federal Fluminense
    Mestrado em Engenharia Ambiental pelo Instituto Federal Fluminense. Técnico Judiciário - Área Administrativa do Tribunal Regional do Trabalho.

References

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Published

10-12-2025

Issue

Vol. 19 No. 2 (2025): Boletim do Observatório Ambiental - IFF

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Original articles

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Copyright (c) 2025 Gildo Rafael Almeida Santana, Maria Inês Paes Ferreira, Elias Fernandes de Sousa, Rose Angela Hilda Wanzeler Braga

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How to Cite

Rainfall characterization in the southern portion of the IX Hydrographic Region of the state of Rio de Janeiro. Boletim do Observatório Ambiental Alberto Ribeiro Lamego, [S. l.], v. 19, n. 2, p. 138–149, 2025. DOI: 10.19180/2177-4560.v19n22025p138-149. Disponível em: https://editoraessentia.iff.edu.br/index.php/boletim/article/view/23507.. Acesso em: 18 feb. 2026.

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