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Trend Detection in Annual Streamflow Extremes in Brazil

Brazilian National Water Agency (ANA), Setor Policial, Área 5, Quadra 3, Blocos “B”, “L”, “M” e “T”, s/n, Federal District, Brasília 70610-200, Brazil
Department of Civil and Environmental Engineering, Faculty of Technology, University of Brasilia, Brasília 70910-900, Brazil
Author to whom correspondence should be addressed.
Academic Editor: Chang Huang
Water 2022, 14(11), 1805;
Received: 25 April 2022 / Revised: 20 May 2022 / Accepted: 27 May 2022 / Published: 3 June 2022
(This article belongs to the Section Hydrology)
Changes in streamflow extremes can affect the economy and are likely to impact the most vulnerable in society. Estimating these changes is crucial to develop rational adaptation strategies and to protect society. Streamflow data from 1106 gauges were used to provide a comprehensive analysis of change in eight different extreme indices. The modified trend-free prewhitening and the false discovery rate were used to account for serial correlation and multiplicity in regional analysis, issues shown here to distort the results if not properly addressed. The estimated proportion of gauges with significant trends in low and high flows was about 23% and 15%, respectively. Half of these significant gauges had more than 60 years of data and were associated with changes greater than 5% per decade. A clear spatial pattern was identified, where most increasing trends in both low and high flows were observed in Southern Brazil, and decreasing trends in the remaining regions, except for the Amazon, where a pattern is not clear, and the proportion of significant gauges is low. Results based only on gauges unaffected by reservoirs suggest that reservoirs alone do not explain the increasing trends of low flows in the southern regions nor the decreasing trends in high flows in the remaining hydrographic regions. View Full-Text
Keywords: trend detection; streamflow extremes; serial correlation; multiplicity of hypothesis test trend detection; streamflow extremes; serial correlation; multiplicity of hypothesis test
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MDPI and ACS Style

Souza, S.A.d.; Reis, Jr., D.S. Trend Detection in Annual Streamflow Extremes in Brazil. Water 2022, 14, 1805.

AMA Style

Souza SAd, Reis, Jr. DS. Trend Detection in Annual Streamflow Extremes in Brazil. Water. 2022; 14(11):1805.

Chicago/Turabian Style

Souza, Saulo A. de, and Dirceu S. Reis, Jr. 2022. "Trend Detection in Annual Streamflow Extremes in Brazil" Water 14, no. 11: 1805.

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