Suspended matter and nutrient gradients of a small-scale river plume in Sepetiba Bay, SE-Brazil

Rodrigues, Raphael Paiva; Knoppers, Bastiaan A.; Friederichs, Weber; Santos, Elisamara Sabadini

doi:10.1590/s1516-89132009000200030

Cited by 15 publications

(13 citation statements)

References 15 publications

(26 reference statements)

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“…At this region of the estuary, the tidal influences are observed according to the fluctuation of the semi‐diurnal tide mostly during spring tides. Many authors (Knoppers and Kjerfve, 1999; Knoppers et al , 2005; Molisani et al , 2006; Rodrigues et al , 2009) have been using data of the limnimetrics rulers located at greater distances from the sea (in the case of Jaguaribe River, located more than 35 km upstream from the estuary) to estimate discharge and material fluxes to the estuary and from there to the coastal zone, completely underestimating the actual continental fluxes to the sea (Figure 3): for example, where dams exist between the section of discharge estimation and the sea, such as in the case of the Jaguaribe River or when significant differences in climate regime and local geomorphology exist along the watershed basin, such as in the Contas River basin.…”

Section: Methodsmentioning

confidence: 99%

Comparative analysis of rating curve and ADP estimates of instantaneous water discharge through estuaries in two contrasting Brazilian rivers

Dias

Lacerda

Marins

et al. 2011

Hydrological Processes

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Abstract:This work quantifies, using ADP and rating curve techniques, the instantaneous outflows at estuarine interfaces: higher to middle estuary and middle to lower estuary, in two medium-sized watersheds (72 000 and 66 000 km 2 of area, respectively), the Jaguaribe and Contas Rivers located in the northeastern (semi-arid) and eastern (tropical humid) Brazilian coasts, respectively. Results from ADP showed that the net water balances show the Contas River as a net water exporter, whereas the Jaguaribe River Estuary is a net water importer. At the Jaguaribe Estuary, water retention during flood tide contributes to 58% of the total volume transferred during the ebb tide from the middle to lower estuary. However, 42% of the total water volume (452 m 3 s 1 ) that entered during flood tide is retained in the middle estuary. In the Contas River, 90% of the total water is retained during the flood tide contributing to the volume transported in the ebb tide from the middle to the lower estuary. Outflows obtained with the rating curve method for the Contas and Jaguaribe Rivers were uniform through time due to river flow normalization by dams in both basins. Estimated outflows with this method are about 65% (Contas) and 95% (Jaguaribe) lower compared to outflows obtained with ADP. This suggests that the outflows obtained with the rating curve method underestimate the net water balance in both systems, particularly in the Jaguaribe River under a semi-arid climate. This underestimation is somewhat decreased due to wetter conditions in the Contas River basin.

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Section: Methodsmentioning

confidence: 99%

Comparative analysis of rating curve and ADP estimates of instantaneous water discharge through estuaries in two contrasting Brazilian rivers

Dias

Lacerda

Marins

et al. 2011

Hydrological Processes

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“…These levels were found, for example, from the wet to the dry period in the Sao Francisco River, Brazil, and other freshwater environments [9], [10].…”

Section: Discussionmentioning

confidence: 90%

“…Those discharges were given at the end of summer and the beginning of autumn, while the lowest ones were given in winter (for about 18-20 µmolL -1 ). Considering this, and in addition to pH in descendant temperature increasing these measurements, could be considered as related aspects attributed to oxidative processes of organic matter degradation that would be in constant entry to the estuary while it discharges [9].…”

Section: Discussionmentioning

confidence: 99%

Nutrient Distributions in an Estuary of the Argentine Coast

Abrameto

Torres

Ruffini

2017

WIT Transactions on Ecology and the Environment

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We performed a discrete sampling that was programmed to research the axial distribution of dissolved nutrients in surface waters of the Negro river estuary in Argentina. The total dissolved nitrogen (TDN) was composed mainly of NO3 -and NH4 + ; but NO2 -was not detected. Total dissolved phosphorus (TDP) was in PO4 -3 and organic species. We obtained spatial and seasonal comparisons from data collected during 2013 and 2016. Both nutrients showed, by analysis of variance (ANOVA), significant differences among the seasons of the year (TDN p<0.0001 and TDP p<0.001). In the internal estuary, the lowest winter levels were 19.4 µM TDN/L, showing that there is a significant difference with autumn levels of 245.6 µM TDN/L by LSD Fischer test (p=0.05); however, the TDN levels in spring were lower than winter at the beginning of the external estuary, and these differences were not significant and could possibly be an indicator of atmospheric removal or re-sedimentation processes in the area. Average TDP values moved in the range between 1.82 µM/L in autumn at the highest, to the lowest values in winter of 0.93 µM/L. The Pearson correlation of N-NO3 and P-PO4 in mg/L to the environmental properties showed a negative correlation with salinity, with a range of 0 to 8% pH, and positive correlations with dissolved oxygen. These eutrophication conditions, as with other rivers of the world, could be generating biodiversity imbalances.

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“…Along with urbanization and industrialization increase in last decades, they had caused environmental degradation, mostly through Cd and Zn contamination (Marques et al 2006;Rodrigues et al 2009). The last dredge of its contaminated sediments, supported by the harbors authorities and maritime terminals owners, required safe procedures .…”

Section: Study Areamentioning

confidence: 99%

Trace metal distribution in white shrimp (Litopenaeus schmitti) tissues from a Brazilian coastal area

et al. 2016

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Biomonitoring in situ was performed in order to assess Sepetiba Bay's Litopenaeus schmitti efficiency as environmental contamination biomonitor, an area historically contaminated by metals and where this shrimp is the second most abundant species. Trawlings were conducted during rainy and dry seasons close to the main pollution sources to evaluate Cd, Cr, Cu, Mn, Pb, and Zn concentrations in muscle, exoskeleton, and whole body. After specimen classification, biometrics measurements, sex and age determination, samples were dried (50°C) and grinded before acid extraction of metals, followed by ICP OES quantification. Concentrations were higher in whole shrimp samples, followed by exoskeleton and subsequently muscle samples. The descending concentration order was Zn [ Cu [ Mn [ Cr [ Cd [ Pb. Comparing previous studies in the area, Pb and Zn concentrations have decreased and Cu has increased. Males and females showed no significant differences. Adults showed higher concentrations of Cr and Zn than juveniles, but bioconcentration factor did not exceed 10 -2 , except for Cu (10 -1 ). Nevertheless, it did not mean intake absence, once concentrations of Cr and Cu reached values above and close, respectively, to the consumption law.

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Suspended matter and nutrient gradients of a small-scale river plume in Sepetiba Bay, SE-Brazil

Abstract: Coastal river plumes represent one of the final stages of material transport across the land-sea interface. Most studies, however have focused on the behavior of medium to large sized river plumes of coastal-shelf waters

Cited by 15 publications

References 15 publications

Comparative analysis of rating curve and ADP estimates of instantaneous water discharge through estuaries in two contrasting Brazilian rivers

Comparative analysis of rating curve and ADP estimates of instantaneous water discharge through estuaries in two contrasting Brazilian rivers

Nutrient Distributions in an Estuary of the Argentine Coast

Trace metal distribution in white shrimp (Litopenaeus schmitti) tissues from a Brazilian coastal area

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