Spatial mapping of annual rainfall in the São Francisco River Basin

  • Willian dos Santos Oliveira Faculdade de Engenharia. Universidade Federal da Grande Dourados (UFGD), Rodovia Dourados/Itahum, Km 12, Unidade II, Caixa Postal: 364, Cep: 79804-970, Dourados, MS, Brazil.
  • Elias Silva de Medeiros Faculdade de Ciências Exatas e Tecnologia. Universidade Federal da Grande Dourados (UFGD), Rodovia Dourados/Itahum, Km 12, Unidade II, Caixa Postal: 364, Cep: 79804-970, Dourados, MS, Brazil.
  • Alessandra Querino da Silva Faculdade de Ciências Exatas e Tecnologia. Universidade Federal da Grande Dourados (UFGD), Rodovia Dourados/Itahum, Km 12, Unidade II, Caixa Postal: 364, Cep: 79804-970, Dourados, MS, Brazil.
  • Luciano Antonio de Oliveira Faculdade de Ciências Exatas e Tecnologia. Universidade Federal da Grande Dourados (UFGD), Rodovia Dourados/Itahum, Km 12, Unidade II, Caixa Postal: 364, Cep: 79804-970, Dourados, MS, Brazil.
DOI: https://doi.org/10.4136/ambi-agua.2762

Abstract

Precipitation is an important object of study and plays an important role in the dynamics of rainfall distribution in a region. This study investigated the spatial and temporal variation of precipitation in the São Francisco River Basin (SFRB). A historical series of data from 1989 to 2018 was analyzed, and a random function was decomposed into trend and residual components for analysis of precipitation. Interpolation techniques were used to analyze precipitation spatial behavior over time, using high-resolution precipitation maps. Our results showed that the exponential model prevailed in four periods. The findings also showed a high precipitation variability in the SFRB and enabled us to monitor precipitation behavior over the years, as well as in the different sub-regions in SFRB. Finally, important information was obtained, enabling, for instance, the identification of vulnerable areas suffering from lack of rainfall.

Keywords: kriging, R software, variogram.


Published
31/05/2022
Issue
Vol. 17 No. 3 (2022)
Section
Papers

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