Aporte de sedimentos em suspensão no baixo Rio São Francisco (SE/AL), em diferentes condições hidrológicas

Medeiros, Paulo Ricardo Petter; Knoppers, Bastiaan A.; Souza, Weber Friederichs Landim de; Oliveira, Eduardo N.

doi:10.14210/bjast.v15n1.p42-53

Cited by 24 publications

(37 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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.

View full text Add to dashboard Cite

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.

show abstract

“…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.

View full text Add to dashboard Cite

show abstract

“…Precipitation and water run-off effects on nutrients loads and total suspended sediment in the lower São Francisco river have been previously studied (e.g., Medeiros et al 2011a, b), but many questions still remain about how historically the lower São Francisco river ecosystem will respond to long-term dam cascade constructed along its middle-lower semi-arid river course. The changes in nitrogen nutrients reported herein reflect responses to water run-off by the limnological variables and chlorophyll-a that drive key geochemical reactions.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The São Francisco River has been utilized to several hydropower man-made constructions, water supply, navigation and flood control (Medeiros et al, 2007(Medeiros et al, , 2011a. The most frequent structures are dams, which have considerably altered the hydrologic regime within the lower portion of the river, modifying the water discharges as well as reducing the solid loads downstream (Medeiros et al, 2011a, b). Although extremely important at national and regional levels, due to its multi-purpose water resources, São Francisco river has been relatively poorly studied in regards to the limnological variability, with previous studies only covering periods of one hydrological year or less (Crispim & Watanabe, 2000, Souza & Knoppers, 2003, Latrubesse et al, 2005 In comparison, the climate in the middle-lower and lower São Francisco is very dry and presents a different seasonal rainfall distribution (Bernardes, 1951).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inter-annual variability on the water quality in the Lower São Francisco River (NE-Brazil)

et al. 2016

Self Cite

View full text Add to dashboard Cite

Aim This study characterized the water quality in the lower São Francisco River (NE-Brazil).This research represents the first work to be carried out in the lower sector of the São Francisco river aiming to quantify and compare limnological variables, during three different years (2001, 2004 and 2007). Methods Water samples were collected in a transversal section of the river at monthly intervals period on surface layer. Temperature, conductivity, pH, and dissolved oxygen were obtained using a multiparameter probe YSI-6600. The dissolved inorganic nutrients (ammonium, nitrite, nitrate, dissolved phosphorus and silicates), chlorophyll-a and total suspended sediment (TSS) were also determined. Results The three hydrological years showed differences in precipitation rates and discharge conditions. The year 2001 had precipitation rates below the historical series of rainfall. The mean annual water temperature showed negligible differences among the three years. Dissolved inorganic nutrient concentrations were highest in 2004, with ammonia and nitrate differing statistically between the years (p<0.05); the later showed the largest concentration of dissolved inorganic nitrogen. Chlorophyll-a showed a slight difference among years. Conclusions Precipitation intensity has a direct impact on the São Francisco River discharge, but the geographical distribution of the precipitation is also a determinant factor for alterations of the chemical and physical characteristics of the water that reaches the lower sector of the São Francisco River.

show abstract

“…Generally, peak periods are associated with higher concentrations of SPM in the water column. However, this relationship can be modified due to human impacts on the watershed, such as hydrological changes resulting from the dams (Medeiros et al 2011). As the Santa Maria da Vitória River, the main freshwater source to the estuary, has a controlled flow due to a catchment for urban water supplies downstream, no clear relationship should exist between the discharge and the concentration.…”

Section: Characterizationmentioning

confidence: 99%

Hydrodynamic Aspects at Vitória Bay Mouth, ES

Garonce¹,

Quaresma²

2014

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

Understading the hydrodynamic behavior and suspended particulated matter (SPM) transport are of great importance in port regions such as Vitória Harbor, which is located at Vitória Bay, Vitória -ES, Brazil. Vitória Bay is an estuary that has not been systematically assessed through a temporal analysis in order to identify its hydrodynamics characteristics and SPM exchange. This study aims to investigate salt and suspended particulate matter flux at the estuarine mouth of Vitória Bay by understanding the temporal variation of salinity, temperature and tidal currents within the water column and at the channel crosssection. Results showed that the estuarine mouth tended to present partial stratification periods during neap tides and little stratification in spring tides. The circulation pattern was mainly influenced by the tide, with little influence from river discharge. With regard to the SPM, the mouth of the estuary tended to show low concentrations, with the highest values occurring during the dry season. A close relationship between momentary discharge, SPM and salt fluxes was observed. Despite all the data was collected at the mouth of the estuary, the system showed an importation trend of salt in all cycles and SPM importation for three of the four studied tidal cycles. Thus, Vitoria Bay is not exporting SPM to the adjacent inner shelf.

show abstract

Aporte de sedimentos em suspensão no baixo Rio São Francisco (SE/AL), em diferentes condições hidrológicas

Cited by 24 publications

References 11 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

Inter-annual variability on the water quality in the Lower São Francisco River (NE-Brazil)

Hydrodynamic Aspects at Vitória Bay Mouth, ES

Contact Info

Product

Resources

About