A grande aceleração e a construção de barragens hidrelétricas no Brasil

Oliveira, Nathalia Capellini Carvalho de

doi:10.1590/0104-87752018000200003

Cited by 25 publications

(14 citation statements)

References 3 publications

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“…These swarms were well monitored by local networks. The histogram also shows the increased monitoring and dam construction since 2002 (Oliveira, 2018).…”

Section: Reservoir-triggered Seismicity List Updated For the Databasementioning

confidence: 99%

Spatial database and website for reservoir-triggered seismicity in Brazil

Sayão¹,

França²,

Holanda³

et al. 2020

Nat. Hazards Earth Syst. Sci.

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Abstract. After confirming that impoundment of large reservoirs could cause earthquakes, studies on reservoir-triggered seismicity (RTS) have had a considerable scientific incentive. Most of the studies determined that the vertical load increase due to reservoir load, and the reduction of effective force due to the increase in pore pressure, can modify the stress field in the reservoir region, possibly triggering earthquakes. In addition, the RTS is conditioned by several factors such as pre-existing tectonic stresses, reservoir height/weight, area-specific geological and hydromechanical conditions, constructive interaction between the orientation of seismotectonic forces, and additional load caused by the reservoir. One of the major challenges in studying RTS is to identify and correlate the factors in the area of influence of the reservoir, capable of influencing the RTS process itself. A spatial seismicity-triggered reservoir database was created to facilitate the research in this field, based on the specifications of the national spatial data infrastructure (INDE), and to assemble data pertinent to the RTS study in the area of reservoirs. In this context, this work presents the procedures and results found in the data processing of seismotectonic factors (dam height, reservoir capacity, lithology, and seismicity) and compared first to the dams that triggered earthquakes and secondly to the Brazilian dam list. The list has been updated with four more cases, making a total of 30 cases. The results indicate that the occurrence of RTS increases significantly with dam height since dams less than 50 m high cause only 2 % of earthquakes while those higher than 100 m cause about 54 %. The reservoir volume also plays a role, and it was estimated that RTS occurrence requires a limiting minimum value of 1×10-4 km3. There was no clear correlation between the geology and geological provinces with RTS. The delayed response time of the reservoirs represents 43 % of the total; that is, almost half of them have hydraulic behavior. The highest magnitude, 4.2, was observed at a reservoir with a volume greater than 10−3 km3. As a practical outcome, to assist the analysis by the general community, the web viewer RISBRA (Reservoir Induced Seismicity in Brazil) was developed to serve as an interactive platform for Reservoir-Triggered Seismicity Database (BDSDR) data.

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“…These swarms were well monitored by local networks. The histogram also shows the increased monitoring and dam construction since 2002 (Oliveira, 2018).…”

Section: Reservoir-triggered Seismicity List Updated For the Databasementioning

confidence: 99%

Spatial database and website for reservoir-triggered seismicity in Brazil

Sayão¹,

França²,

Holanda³

et al. 2020

Nat. Hazards Earth Syst. Sci.

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“…Atividades de mineração de calcário e diamante ocorrem em menor escala na atualidade, estas são responsáveis pela contribuição do desmatamento de grandes áreas e alteração da mata ciliar. É uma região de planalto onde se concentra a maioria das nascentes da BHC, como as nascentes da sub-bacia do rio Manso e seus afluentes (Libos, et al, 2003;Oliveira et al, 2018). Figura 1.…”

Section: áRea De Estudo: O Rio Cuiabáunclassified

“…Hoje o Brasil é um dos maiores construtores de barragens mundiais e o segundo país que gera mais energia hidrelétrica no mundo, atrás da China, com a hidroeletricidade representando 12,6% do total de energia consumida domesticamente e 68,1% da eletricidade do país (Oliveira, 2018).…”

Section: Introductionunclassified

Implementação de barragens para aproveitamentos hidrelétricos: os desdobramentos da instalação de PCH’s no rio Cuiabá, Cuiabá - MT

Costa

Silva

2021

RSD

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O estudo visa às dinâmicas circunstanciais em torno do licenciamento ambiental de pequenas centrais hidrelétricas (PCH’s) no estado de Mato Grosso. O mesmo, caracteriza-se como qualitativo, baseando - se na intenção de instalação de PCH’s no rio Cuiabá - MT, com informações provenientes de estudos de vários artigos, dissertações, teses e de consultas realizadas no acervo da Agência Nacional de Energia Elétrica, da Agência Nacional de águas e Saneamento Básico e da mídia local. Verifica-se, em suma, que o problema não está sobre a capacidade do licenciamento, e sim sobre os conflitos e possíveis impactos que possam vir a serem gerados a partir da implantação das PCH’s, na biodiversidade geral, nas comunidades ribeirinhas que vivem em seu entorno e à jusante do rio, e principalmente na reprodução dos peixes. O estudo demostra uma ocorrência distinta da comunidade em relação à implementação das PCH’s no trecho do rio Cuiabá, pois em comparação a outros projetos de implementação no Estado, ganhou particular atenção de diferentes membros da sociedade, como promotores, juízes, deputados, bem como do setor acadêmico, não sendo somente da comunidade ribeirinha, demonstrando que a implementação das PCH’s no Rio Cuiabá, além dos impactos comumente conhecidos, demostra que a importância do rio vai além dos aspectos ambientais, promovendo comoção entre os moradores da região.

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“…Brazil is the second greatest generator of hydroelectric power after China. Furthermore, it is one of the countries that builds the most dams in the world [12]. Today, in Brazil, hydroelectricity represents 68.1% of the country's electricity [13].…”

Section: Introductionmentioning

confidence: 99%

Semi-Rigid Erosion Control Techniques with Geotextiles Applied to Reservoir Margins in Hydroelectric Power Plants, Brazil

Aparicio-Ardila

Santos

Kobelnik

et al. 2021

Water

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In Brazil, hydroelectricity represents close to 70% of the energy consumed in the country. However, hydroelectric plant operations may be affected by the deposit of sediments for erosive processes on reservoir margins. This study presents the results of implementing two semi-rigid erosion control techniques installed on reservoir margins of two Brazilian Hydroelectric Power Plants (HPPs). These techniques were the gabion and gabion mattress used as a mixed technique and geogrid mattress technique. This paper highlights the importance of implementing geotextiles in the construction process of these erosion control techniques, taking advantage of their separation properties. The performance of the techniques was evaluated using qualitative performance variables and by differential bathymetry studies performed in 2016 and 2020 in the experimental units installed in each HPP. Moreover, the degradation of the geotextiles in each installation was evaluated through thermal analysis. The erosion control techniques that showed the best results were gabion and gabion mattress. Regarding the exhumed geotextiles, thermal analyses have shown that the commercial geotextiles that were used can withstand temperatures of up to 200 °C leading to no changes to their structure.

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A grande aceleração e a construção de barragens hidrelétricas no Brasil

Cited by 25 publications

References 3 publications

Spatial database and website for reservoir-triggered seismicity in Brazil

Spatial database and website for reservoir-triggered seismicity in Brazil

Implementação de barragens para aproveitamentos hidrelétricos: os desdobramentos da instalação de PCH’s no rio Cuiabá, Cuiabá - MT

Semi-Rigid Erosion Control Techniques with Geotextiles Applied to Reservoir Margins in Hydroelectric Power Plants, Brazil

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