Análise de Fisher-Shannon da vazão do rio São Francisco: a influência de barragens e reservatórios

Autores

DOI:

https://doi.org/10.33448/rsd-v9i10.8852

Palavras-chave:

Análise de fisher-shannon; Rio São Francisco; Reservatórios.

Resumo

Investigamos como a construção das barragens de Sobradinho e Xingó afetaram a vazão diária do rio São Francisco, usando a análise de Fisher – Shannon. Foram analisadas as séries temporais de vazão diária das estações fluviométricas de Juazeiro/BA e Pão de Açúcar/AL, que estão a jusante dos reservatórios de Sobradinho e Xingó nos períodos anterior a construção de ambos os reservatórios, depois da construção de Sobradinho e após a construção de Xingó e após a construção de ambos os reservatórios. Aplicamos a análise de Fisher-Shannon nas amostras, e em janelas móveis avaliando as diferenças por meio do teste de Kruskal-Wallis. Este método quantifica simultaneamente as propriedades locais e globais da função de densidade de probabilidade do sinal analisado. Observamos que no regime natural, o grau de organização temporal das séries de vazão diminuiu com aumento de área de drenagem. Após a construção de Sobradinho o grau de regularidade da dinâmica da vazão diminuiu em relação ao regime natural, e após a construção de Xingó observamos uma dinâmica de vazão mais regular e mais organizada. Assim, as operações dos reservatórios alteraram o grau de regularidade, e de organização temporal das séries de vazão, conforme indicado por valores de entropia e de informação de Fisher, respetivamente.

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Publicado

06/10/2020

Como Citar

BARRETO, Íkaro D. de C. .; SANTOS, E. F. N. .; STOSIC, T. Análise de Fisher-Shannon da vazão do rio São Francisco: a influência de barragens e reservatórios. Research, Society and Development, [S. l.], v. 9, n. 10, p. e5159108852, 2020. DOI: 10.33448/rsd-v9i10.8852. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/8852. Acesso em: 30 jun. 2024.

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Ciências Agrárias e Biológicas