Causes and consequences of seasonal changes in the water flow of the São Francisco river in the semiarid of Brazil

Santos, Anderson dos; Lopes, Pabrício Marcos Oliveira; Silva, Marcos Vinícius da; Jardim, Alexandre Maniçoba da Rosa Ferraz; Moura, Geber Barbosa de Albuquerque; Fernandes, Gabriel Siqueira Tavares; Silva, Douglas Alberto de Oliveira; Silva, John Lennon Bezerra da; Rodrigues, Joez André de Moraes; Silva, Emanuel Araújo; Oliveira‐Júnior, José Francisco de

doi:10.1016/j.indic.2020.100084

Cited by 35 publications

(18 citation statements)

References 46 publications

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“…Observou-se que a curva acentuada à direita -próxima à seção 2 -proporciona uma diminuição do fluxo de água, contribuindo, assim, para formação de banco de areias (Figura 7). Tal fato pode ser associado ao modelo de uso da terra a partir da degradação do solo e alterações do fluxo de velocidade de escoamento da água proporcionado pela construção do reservatório que passa a regular a vazão do rio, fato este também destacado por Almeida, Figueiredo e Oliveira (2016) no reservatório de Itacarambi (Brasil) e por Santos et al (2020) no rio São Francisco, entre as cidades de Sergipe e Alagoas.…”

Section: Resultsunclassified

Diagnóstico Batimétrico do Reservatório da Usina Hidrelétrica de Caçu-GO

Gentil

Ramalho

Braga

et al. 2021

Rev. Bras. Geog. Fis.

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O presente trabalho teve como objetivo avaliar as mudanças e os níveis de sedimentação ocorridos no reservatório da Usina Hidrelétrica (UHE) Caçu, entre janeiro de 2014 e março de 2015. Os procedimentos empregados para avaliar o processo de sedimentação do reservatório envolveram o diagnóstico dos locais assoreados por meio de levantamento batimétrico e análise da velocidade de escoamento da água com o uso do acoustic doppler current profiler (ADCP). Os resultados obtidos permitiram identificar alterações no perfil topográfico do reservatório, sendo a perda de volume inferior a 0,5% ao ano. O local de maior acúmulo de sedimentos encontra-se no trecho inicial do reservatório (primeiros 6km), ocorrendo a formação de bancos de areia. Os valores máximos de velocidade de escoamento da água nos períodos avaliados variaram entre 0,858m/s a 1,979 m/s. Os valores mínimos da velocidade de escoamento foram detectados nas áreas entre o córrego do Caju e a barragem da usina hidrelétrica de Caçu. The Bathymetric Diagnosis of the Hydroelectric Power Station from Caçu – GO. A B S T R A C TThis research job has as its goal to evaluate the changes and the sedimentation levels occurred in the reservoir of Hydroelectric Power Station (UHE) Caçu, between January 2014 and March 2015. The procedures employed to evaluate the sedimentation process of the reservoir involved the diagnosis of the locals silted through the bathymetric survey and analysis of the water drainage speed with the use of the acoustic doppler current profiler (ADCP). The results obtained permitted to identify changings on the topographic profile of the reservoir, being the loss of the volume under 0,5% per year. The local of the largest sediment accumulation is located in the initial excerpt (first 6 kilometers) occurring the formation of sandbanks. The maximum speed values of water drainage in the evaluated periods varied between 0,858m/s to 1,979 m/s. The minimum values of drainage speed were detected in the areas between the Caju water stream and the dam of the Hydroelectric Power Station of Caçu.Keywords: Sedimentation. Water Speed. ADCP.

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Section: Resultsunclassified

Diagnóstico Batimétrico do Reservatório da Usina Hidrelétrica de Caçu-GO

Gentil

Ramalho

Braga

et al. 2021

Rev. Bras. Geog. Fis.

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“…The São Francisco River in Brazil also has large dams built to produce electricity (Paiva & Schettini, 2021), and has recently been experiencing severe drought. Some studies have attributed the drought to an intensified El Niño phase of ENSO (Sun et al, 2016), while some have attributed it to increased agricultural and livestock activities (dos Santos et al, 2020). Small hydropower projects in semi‐arid regions of Brazil have experienced a reduction in electricity generation (approximately 3.2 MWh/year) despite an increase in precipitation, as scarce water resources have been prioritized for irrigation and water supply purposes (Medeiros et al, 2021).…”

Section: A Global Survey Of the Impact Of Climate Change On The Hydro...mentioning

confidence: 99%

Climate change and the hydropower sector: A global review

Wasti

Ray

et al. 2022

WIREs Climate Change

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Renewable sources of electricity, such as solar and wind, need to be paired with sources of reliable baseload. Hydropower is a renewable, low‐emission source of electricity baseload available throughout much of the world as an alternative to electricity conventionally provided by thermal combustion of fossil fuels; however, the global hydropower sector as it stands relies upon surface water flows of substantial and predictable volume. This makes it vulnerable to climate change. The impact of climate change on the hydropower sector is difficult to predict, and not globally uniform. It might be positive, negative, or inconsequential depending upon the local timing and magnitude of changes, reservoir size, allocation priority, and the energy market. The secondary effects of climate change on glacier lake outbursts floods, landslides, and sediment load are poorly understood. In addition, when planning hydropower projects for the future, attention must be given to the greenhouse gas contribution of the impounded waters behind storage dams, and the impact of dams on water temperature. In the past decade, sovereign nations and international development agencies worldwide have evaluated the potential of hydropower as a cost‐effective, clean, sustainable option for baseload electricity supply. There is therefore a crucial need to assess the opportunities and risks hydropower poses across a wide range of potential future climate conditions. This review paper conducts a global survey of the literature on the effect of climate change on hydropower and identifies room for improvement in current approaches to evaluation of the net benefits of hydropower projects under climate change. This article is categorized under: Vulnerability and Adaptation to Climate Change > Learning from Cases and Analogies Assessing Impacts of Climate Change > Evaluating Future Impacts of Climate Change

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“…Therefore, a convenient and efficient alternative is the use of Remote Sensing (RS) techniques, which indirectly allow the quality characterization of extensive water bodies for different periods, making it feasible to remotely analyze water quality characteristics ( Aman et al, 2020 ). More importantly, in-depth studies aimed at identifying and characterizing the environmental changes imposed by the reduction of human activity in the environment, followed by the assessment of the impacts generated, are essential for the development of public policies in the short and long term, in addition to raising population awareness ( Santos et al, 2020a ; Silva et al, 2020a , 2020b ; Buck et al, 2021 ). Moreover, the effective use of RS techniques and satellite image geoprocessing enables the expansion of environmental studies in an effective, reliable, practical, and fast way ( Silva et al, 2021a ).…”

Section: Introductionmentioning

confidence: 99%