Nitrogen and phosphorus in cascade multi-system tropical reservoirs: water and sediment

Limnological Review

卷:17

López Pilar¹  Moschini-Carlos Viviane²  Beghelli Frederico Guilherme de Souza²  Cardoso-Silva Sheila²  Rosa André Henrique²  Brandimarte Ana Lúcia³  Pompêo Marcelo³  López-Doval Julio Cesar³  Abdalla-Martins Natália³  Freire Rogério Herlon Furtado⁴ 

[1] Barcelona University, Department of Ecology, Avda. Diagonal 645, 08034Barcelona, Spain;

[2] São Paulo State University (UNESP), Department of Environmental Engineering, Avda. 3 de Março 511, Alto da Boa Vista, CEP 18087-180, Sorocaba, Brazil;

[3] São Paulo University (USP), Bioscience Institute, Department of Ecology, Rua do Matão 321 / Travessa 14, Cidade Universitária, CEP 05508-090, São Paulo, Brazil;

[4] São Paulo Virtual University (UNIVESP), Brazil;

关键词: cascade reservoir;    sediment;    water quality;    nitrogen;    phosphorus;   

DOI  :  10.1515/limre-2017-0013

来源: DOAJ

【 摘 要 】

The aim of this research was to analyze the horizontal spatial heterogeneity of both water and superficial sediment quality among and within the reservoirs of the Cantareira System (CS), focusing on concentrations of N and P, attributed to the dumping of raw domestic sewage into water bodies, which is the main cause of water pollution in São Paulo State (Brazil). The CS is a multi-system complex composed of five interconnected reservoirs, with water transported by gravity through 48 km of tunnels and channels. From the last reservoir of the CS, with an output of 33 m3 s−1, the water is conducted to a water treatment plant, producing half of the water consumed by 19 million people inhabiting São Paulo city. The upstream reservoirs are more eutrophic than the downstream ones. Data also suggest that the low phytoplankton biomass (ranging from 0.9 to 14.4 μg dm−3) is regulated by the low nutrient availability, mainly of phosphorus (TP ranging from below the detection limit, <9.0 μg dm−3, to 47.3 μg dm−3). For water, the DIN/TP ratios values range from 19 to 380. The upstream reservoirs function as nutrient accumulators and the sediment is the main compartment in which P and N are stored. Although the reservoirs are located in different river basins and are not in sequence along the same river, the results suggest a marked gradient between the reservoirs, with features similar to those of cascade reservoirs. The large volumes flowing through the canals and tunnels could explain the observed pattern. The CS reservoirs can therefore be considered multi-system reservoirs in cascade, constituting a particular case of multi-system reservoirs.

【 授权许可】

Unknown