Perfil espacial e temporal de poluentes nas águas da represa municipal de São José do Rio Preto, São Paulo, Brasil

Melo, Camila Almeida; Moreira, Altair Benedito; Bisinoti, Márcia Cristina

doi:10.1590/s0100-40422009000600014

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…Similar behavior has also been observed in different rivers in Brazil (MELO et al, 2009;MEDEIROS et al, 2011).…”

Section: Concentration Of Total Solidssupporting

confidence: 86%

Evaluation of sediment production and siltation in a small earth dam in Fernandópolis, SP

Vanzela¹,

Grecco²,

Neto³

et al. 2014

Eng. Agríc.

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ABSTRACT:The siltation is a natural process, but can be accelerated by human actions and results in major problems for the reservoirs, reducing its useful volume for irrigation. An example of this problem was the reduction of the area of mirror water of Fernandópolis municipal dam in 48.3% during 20 years. Therefore, this study aimed to evaluate the production of sediments and siltation of Fernandópolis municipal dam from a methodology that can be applied to small earth dams for agricultural purposes. For this, it was monitored, monthly throughout the year, the volume of sediment deposited in the reservoir. The percentage of retention sediment in Fernandópolis municipal dam ranged from 53.9 to 94.5%, that associated with a high specific sediment yield, will cause its full silting in at most 57 years. It is recommended to minimize this process the restoration of permanent preservation areas and the removal of 17,500 m 3 of sediment from the riverbed of the dam.KEYWORDS: hydro-sedimentology, use and land occupation, erosion. AVALIAÇÃO DA PRODUÇÃO DE SEDIMENTOS E DO ASSOREAMENTO EMPEQUENA BARRAGEM DE TERRA DE FERNANDÓPOLIS-SP 1 RESUMO: O assoreamento é um processo natural, mas que pode ser potencializado pelas ações antrópicas e resulta em grandes problemas para os reservatórios, reduzindo seu volume útil para a irrigação. Um exemplo deste problema foi a redução da área do espelho d'água da represa municipal de Fernandópolis em 48,3%, durante 20 anos. Por isso, este trabalho teve como objetivo avaliar a produção de sedimentos e o assoreamento da represa municipal de Fernandópolis a partir de metodologia que pode ser aplicável a pequenas barragens de terra para fins agrícolas. Para isto, foi monitorado, mensalmente, durante um ano, o volume de sedimento depositado na represa. O percentual de retenção de sedimentos na represa municipal de Fernandópolis variou de 53,9 a 94,5%, que associada a uma alta produção específica de sedimentos, provocará seu completo assoreamento em, no máximo, 57 anos. Recomendam-se para minimizar este processo, a restauração das áreas de preservação permanente e a retirada de 17.500 m 3 de sedimentos do leito da represa. PALAVRAS-CHAVE:hidrossedimentologia, uso e ocupação do solo, erosão.

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“…Similar behavior has also been observed in different rivers in Brazil (MELO et al, 2009;MEDEIROS et al, 2011).…”

Section: Concentration Of Total Solidssupporting

confidence: 86%

Evaluation of sediment production and siltation in a small earth dam in Fernandópolis, SP

Vanzela¹,

Grecco²,

Neto³

et al. 2014

Eng. Agríc.

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“…Thus, the oxic layers of sediment were thickest in CAPRP, followed by RTURARG and then RGRANDE. This pattern may be due to the shallow depth of CAPRP (0.5-3.0 m) relative to the other aquatic bodies (25-100 m), which provides no stratification of dissolved oxygen in the water column (Melo et al 2009) and may increase oxygenation of the sediment. In the TGDB rivers, the peak concentrations of Mn were above those of Fe and may be attributed to the more thermodynamically favorable reduction of Mn (Metzger et al 2007;Santos-Echeandia et al 2009).…”

Section: Sediment Characteristicsmentioning

confidence: 99%

Metal fluxes at the sediment–water interface in rivers in the Turvo/Grande drainage basin, São Paulo State, Brazil

2012

Self Cite

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Purpose The Turvo/Grande drainage basin (TGDB), located in the northwestern region of São Paulo state, covers an area of 15,983 km 2 . The region is typically regarded as agricultural by the São Paulo State Environmental Agency, but the industrial area is expanding, and some studies have shown that metal concentrations in water can be higher than the values regulated by Brazilian law. Therefore, the aim of this study was to assess the role of sediments as a source or a sink of metals for drainage basin management. Materials and methods Interstitial water from different sediment depths (0-42 cm) and the sediment-water interface and sediment core samples were collected in February and July 2010 from the Preto, Turvo, and Grande rivers. Quantification of Cr, Cu, Fe, Mn, Ni, and Pb in these samples was performed by graphite furnace or flame atomic absorption spectrometry. Metal diffusive flux estimation from sediment into the overlying water was calculated by Fick's First Law of Diffusion. Results and discussion The fluxes of all metals for the three rivers were positive, indicating diffusion into the overlying water. Ni and Pb showed the lowest diffusive fluxes, which ranged from 2.4 to 3,978 μgm −2 day −1 for Ni and from −0.1 to 1,597 μgm −2 day −1 for Pb. In turn, Cu and Cr were subject to the largest transfer to water, especially in the dry season (Cr, 4.5-7,673 μgm −2 day −1 ; Cu, 1.3-14,145 μg m −2 day −1 ). The Preto River (urban area) showed smaller fluxes than the Grande River (agricultural area), and the values of the latter were higher than those found in other impacted areas of the world. Conclusions The diffusive fluxes indicate that sediments from the TGDB act as a source of metals for the water column, with increased export of metals, particularly Cr and Ni, from the sediment into the overlying water during the dry season.

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“…4 shows that temporal variation. In summary, low HIs occur more frequently in summer or autumn, spring or winter usually have relatively lower HIs, since is self-evident that the pollutants are more easily concentrated in the low-flow periods (Melo et al, 2009). A previous study also showed that the seasonal variations in the river water quality with respect to heavy metals contamination (Reza and Singh, 2010).…”

Section: Concentration Of Metals In Groundwatermentioning

confidence: 78%

Non-Carcinogenic Risks Induced by Metals in Drinking Source Groundwater of North Jiangsu (China)

Zhu

Ning

Qian

et al. 2011

AMR

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This study investigated the levels of eight metallic elements in groundwater of 15 tap water treatment plants (TWTPs) located in the North of Jiangsu Province, China during 2007–2009, and evaluated the non-carcinogenic risks posed by the metals. Among the metals, Zn had the highest concentration (105.3 μg L−1), while Pb contributed most (40.3%) to the average hazard index (HI) of 15 TWTPs, followed by Cd (33.8%) and Mn (12.2%). Each metal, except Pb, had an average concentration below the permissible limit of China, WHO, EU and USA. Both hazard quotients of individual metals and HI of total non-carcinogenic risk in each TWTP were lower than 1, indicating that these pollutants provided negligible public health risk for local residents. Non-carcinogenic risks induced by metals showed temporal and spatial variations, revealing that low HIs occurred more frequently in high water seasons, and the three TWTPs of Xinan, Suqian and Biantang had relatively higher HIs.

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Perfil espacial e temporal de poluentes nas águas da represa municipal de São José do Rio Preto, São Paulo, Brasil

Cited by 10 publications

References 14 publications

Evaluation of sediment production and siltation in a small earth dam in Fernandópolis, SP

Evaluation of sediment production and siltation in a small earth dam in Fernandópolis, SP

Metal fluxes at the sediment–water interface in rivers in the Turvo/Grande drainage basin, São Paulo State, Brazil

Non-Carcinogenic Risks Induced by Metals in Drinking Source Groundwater of North Jiangsu (China)

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