Dams Impacts upon the fluxes of biogenic matter

Souza, Weber Friederichs Landim de; Medeiros, Paulo Ricardo Petter; Brandini, Nilva; Knoppers, Bastiaan A.

doi:10.5935/1984-6835.20110016

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…Dams increase breath and water supply, as well as sediments and nutrients. Dams retain and transform materials, altering the natural ux of material, changing the capacity of transport (Souza et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Geochemical behavior of rare earth elements (REE) in urban reservoirs: the case of Funil Reservoir, Rio de Janeiro State, Brazil

Santos-Neves,

Patchineelam,

Araujo

et al. 2023

Environ Monit Assess

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Rare earth elements (REE) have unique chemical properties, which allow their use as geochemical tracers.In this context, the present study aims to assess the role of Funil Reservoir on REE biogeochemical behavior. We collected water samples upstream of the reservoir (P-01) in the city of Queluz, inside the reservoir (P-02) and downstream of Funil Reservoir (P-03) in the city of Itatiaia, RJ. In the eld, physicochemical parameters were measured using a probe (pH, temperature, electrical conductivity, and dissolved oxygen). In the laboratory, water samples were ltered (0,45 µm) and properly packed until chemical analysis. Chlorophyll a concentrations were determined by a spectrophotometric method and suspended particulate matter (SPM) by a gravimetric method. Ionic concentrations were determined by ion chromatography technique and REE concentrations were determined by ICP-MS. Chlorophyll a concentrations were higher in Funil Reservoir. Ionic concentrations in Queluz (P-01) suggest anthropic contamination. The sum of REE in the dissolved fraction ranged from 2.12 to 12.22 µg L − 1 . A positive anomaly of La in Queluz indicates anthropic contamination. The observed patterns indicate that Funil Reservoir acts as a biogeochemical barrier, modifying the uvial transport of REE. Nonetheless, another factor that probably in uences REE behavior is the algal bloom that occurs in reservoirs during the rainy season. The seasonal behavior of algae can in uence REE biogeochemistry through the incorporation and release of trace metals.

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Section: Introductionmentioning

confidence: 99%

Geochemical behavior of rare earth elements (REE) in urban reservoirs: the case of Funil Reservoir, Rio de Janeiro State, Brazil

Santos-Neves,

Patchineelam,

Araujo

et al. 2023

Environ Monit Assess

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“…7 Além disto, a construção de barragens reduz ainda mais o aporte fluvial para o mar. [8][9][10] Entretanto, de forma similar ao que ocorre no Ártico, concentrações elevadas de Hg, por exemplo, também vem sendo medidas na biota marinha local, 11,12 sugerindo aumentos da contribuição continental do metal apesar de ocorrer a diminuição progressiva do aporte fluvial total. Neste trabalho, este paradoxo é discutido com base em dados plurianuais dos fluxos de Hg e da hidrodinâmica do rio Jaguaribe (CE), o principal rio do semiárido do nordeste brasileiro.…”

Section: Introductionunclassified

The Arctic Paradox: Impacts of Climate Changes on Rivers from the Arctic and the Semiarid Increase Mercury Export to the Ocean

Lacerda¹,

Marins²,

Dias³

et al. 2012

Revista Virtual De Química

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Abstract:The semi-arid coast of Brazil is being strongly affected by regional land use and global climate changes, resulting in decreasing continental runoff to the ocean and increasing the water residence time in estuaries and expanding mangrove areas; these in turn may induce an increase of particulate Hg accumulation within the estuaries and increase the export of dissolved Hg to the ocean. This is, paradoxically, what is presently happening in Arctic rivers due to increasing, not decreasing, continental runoff associated with global climate changes.Keywords: Mercury; estuaries; bioavailability; regional and global changes. ResumoO litoral semiárido do nordeste brasileiro vem sendo afetado fortemente por alterações regionais nos usos do solo e pelas mudanças climáticas globais, resultando em diminuição do aporte continental ao mar, aumentando o tempo de residência da massa de água fluvial nas regiões estuarinas e provocando uma expansão nas áreas de manguezais. Isto por sua vez, vem aumentando a acumulação de Hg particulado nos estuários e a exportação de Hg dissolvido para o mar. Paradoxalmente, este processo é similar ao que atualmente ocorre nos rios que deságuam no Oceano Ártico, porém devido ao aumento e não à diminuição do aporte continental. Palavras-chave:Mercúrio; estuários; biodisponibilidade; mudanças regionais e globais.

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A climatology of the annual cycle of river discharges into the Brazilian continental shelves: from seasonal to interannual variability

et al. 2018

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Dams Impacts upon the fluxes of biogenic matter

Cited by 3 publications

References 23 publications

Geochemical behavior of rare earth elements (REE) in urban reservoirs: the case of Funil Reservoir, Rio de Janeiro State, Brazil

Geochemical behavior of rare earth elements (REE) in urban reservoirs: the case of Funil Reservoir, Rio de Janeiro State, Brazil

The Arctic Paradox: Impacts of Climate Changes on Rivers from the Arctic and the Semiarid Increase Mercury Export to the Ocean

A climatology of the annual cycle of river discharges into the Brazilian continental shelves: from seasonal to interannual variability

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