Estimates of benthic fluxes of nutrients across the sediment–water interface (Guarapiranga reservoir, São Paulo, Brazil)

Abstract Aim: This paper describes some limnological variables of four reservoirs with different trophic status (Billings, Guarapiranga, Jundiaí and Paiva Castro) of the Metropolitan Region of São Paulo, Brazil, aiming to characterize the water quality in these reservoirs. Methods Water sampling occurred between October 2011 and September 2012, on subsurface, at the pelagic compartment. Physical and chemical characteristics of water were evaluated, and the Trophic State Index (TSI) was calculated. Multivariate Principal Components Analysis (PCA) was used to ordinate sampling sites and periods in relation to environmental data. Results Two reservoirs were classified as eutrophic (Billings and Guarapiranga), one as mesotrophic (Jundiaí) and one as oligotrophic (Paiva Castro). The highest concentrations of total phosphorus, nitrogen and chlorophyll a were recorded in the eutrophic reservoirs. The lowest values of dissolved oxygen concentration were registered at Guarapiranga reservoir. Residence time in Paiva Castro reservoir was very low (one day); on the other hand, the highest value was recorded in Billings reservoir: 428 days.

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

Journal of Soils and Sediments ◽

10.1007/s11368-012-0591-0 ◽

2012 ◽

Vol 12 (10) ◽

pp. 1508-1516 ◽

Cited By ~ 10

Author(s):

Mariele B. Campanha ◽

Altair B. Moreira ◽

Márcia Cristina Bisinoti

Keyword(s):

Drainage Basin ◽

Sao Paulo ◽

Water Interface ◽

São Paulo ◽

Paulo State ◽

São Paulo State

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Conflitos decorrentes da ocupação do solo nas margens da represa Guarapiranga, no município de Embu Guaçu, em consonância com a legislação ambiental vigente

Revista Principia - Divulgação Científica e Tecnológica do IFPB ◽

10.18265/1517-03062015v1n33p21-28 ◽

2017 ◽

Vol 1 (33) ◽

pp. 21

Author(s):

Maurício Tadeu Sobrinho ◽

Fabrício Bau Dalmas ◽

Renata Aparecida Costa ◽

Antonio Roberto Saad

Keyword(s):

Rural Areas ◽

Field Work ◽

Sao Paulo ◽

Google Earth ◽

Metropolitan Region ◽

São Paulo ◽

Quality Of Water ◽

Special Cases ◽

Forest Code ◽

Guarapiranga Reservoir

<p>The Forest Code (Federal Law 12.651/12) defined limits for the occupation and use of soil, creating the Permanent Preservation Areas (PPA), because the occupation and human activities, exercised on the banks of the great water-supply reservoirs, increases constantly, impairing the quality of water, the flora and fauna, phenomenon known as anthropic activity. The Guarapiranga Reservoir is located in the southwest of the Metropolitan Region of São Paulo; covering part of the Cotia, Embu, Itapecerica da Serra, Juquitiba, São Lourenço da Serra, Embu Guaçu and São Paulo municiçpalities. The objective of this study is to observe the situation of the area covered by surroundings of the Guarapiranga Reservoir and its tributary basin, in particular in the Embu Guaçu municipality, as regards the use of water and soil occupation, in line with the Brazilian Forest Code and relevant legislation. They were used geo-processing techniques to define the use of the banks of the reservoir within the Area of Permanent Protection (with 100 meters in rural areas and 30 meters in urban). This delimitation was carried out on Google Earth a program QGIS. This application of geoprocessing technique was accompanied by field work through which it was possible, to analyze the occupation and soil use in the study area. As final result, it was observed that, except special cases, the law determining the use of soil within the Permanent Preservation Areas, is being respected in the municipality of Embu Guaçu.</p>

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