Evaluation of pluviometric and fluviometric indices in the Paraíba do Sul river basin.

IF 1.1 4区综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES

Anais da Academia Brasileira de Ciencias Pub Date : 2025-07-14 eCollection Date: 2025-01-01 DOI:10.1590/0001-3765202520240575

Agueda T DE Carvalho, Celso B M Ribeiro, Aline S Procópio

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Abstract

Rainfall and river flow indices in the Paraíba do Sul river basin from 1962 to 2022 were evaluated to characterize extreme maximum flow and rainfall events. Data were collected from pluviometric and fluviometric stations in 10 municipalities using the HIDROWEB platform. Extreme values for rainfall and flow were identified using the 99th percentile and the Gumbel distribution, respectively. The Mann-Kendall test analyzed trends in extreme events and historical time series. Results indicated that extreme events were mostly not statistically significant. However, the historical series showed a balance of positive and negative trends in precipitation, while all flow trends were negative. A spatial distribution map of accumulated rainfall averages was created using the Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) platform, revealing spatial rainfall heterogeneity across the basin. Additionally, a double-mass graph from CHIRPS data compared changes within sub-basins to the basin's average. This work concludes that while there is a trend of decreasing streamflow in the Paraíba do Sul basin, precipitation levels have not shown a corresponding decrease, suggesting that the reduction in streamflow is not primarily due to meteorological factors.

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Paraíba Sul河流域降水计量指标及河流计量指标评价。

利用1962 - 2022年Paraíba do Sul河流域的降雨和河流流量指标对极端最大流量和降雨事件进行了表征。使用HIDROWEB平台从10个城市的雨量测量站和河流测量站收集数据。降雨量和流量的极值分别使用第99百分位和甘贝尔分布来确定。曼-肯德尔检验分析了极端事件和历史时间序列的趋势。结果表明，极端事件大多无统计学意义。历史序列降水呈正负平衡趋势，而流量均为负趋势。利用CHIRPS （Climate Hazards Group Infrared Precipitation with Stations）平台绘制了累积平均降雨量的空间分布图，揭示了整个流域的降雨空间异质性。此外，来自CHIRPS数据的双质量图将子盆地内的变化与盆地平均值进行了比较。这项工作的结论是，虽然Paraíba do Sul盆地有减少流量的趋势，但降水水平并没有显示出相应的减少，这表明流量的减少主要不是由于气象因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Anais da Academia Brasileira de Ciencias 综合性期刊-综合性期刊

CiteScore

2.20

自引率

0.00%

发文量

347

审稿时长

1 months

期刊介绍： The Brazilian Academy of Sciences (BAS) publishes its journal, Annals of the Brazilian Academy of Sciences (AABC, in its Brazilianportuguese acronym ), every 3 months, being the oldest journal in Brazil with conkinuous distribukion, daking back to 1929. This scienkihic journal aims to publish the advances in scienkihic research from both Brazilian and foreigner scienkists, who work in the main research centers in the whole world, always looking for excellence. Essenkially a mulkidisciplinary journal, the AABC cover, with both reviews and original researches, the diverse areas represented in the Academy, such as Biology, Physics, Biomedical Sciences, Chemistry, Agrarian Sciences, Engineering, Mathemakics, Social, Health and Earth Sciences.