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AVALIAÇÃO ESPAÇO-TEMPORAL DA RELAÇÃO ENTRE O ESTADO TRÓFICO DO RESERVATÓRIO DE BARRA BONITA (SP) E O POTENCIAL POLUIDOR DE SUA BACIA HIDROGRÁFICA / Assessment of the space-time relationships between the UHE Barra Bonita Trophic State and its drainage basin pollution potential

Author(s): Rachel Bardy Prado | Evlyn M.L. M Novo

Journal: Revista Sociedade & Natureza
ISSN 0103-1570

Volume: 19;
Issue: 2;
Start page: 5;
Date: 2007;
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Keywords: Barra Bonita | water quality | land use/land cover | point and nonpoint pollution.

This research aimed to understand the fast water degradation process in overpopulated áreasas a result of inadequate land use and land cover practices. Therefore, the objetive of thisstudy is to assess the relationship between the trophic state of the Barra Bonita Reservoir(SP)and the pollution potential of its drainage basin in space and time. The trophic statedetermination was based in water samples collected at 32 stations evenly distributed in thelake in two dates: 1990 and 2002. These samples were used to determine the key parametersfor the computation of the Trophic State Index (TSI), which was then spatialised with aid of theESRI ArcView 3.2 sofware. The pollution potential was based on several data: land use andland cover maps derived from the Landsat /Thematic Mapper images acquired in 1990 and2002; population growth and nitrogen and phosphor load. The results showed the increase inthe water trophic level from 1990 to 2002, but this increase was not homogenous. The waterquality degradation, as expressed by the TSI was highest in Tietê river compartment due toresponse to the higher pollution potential of São Paulo city. The space and time integratedanalyses of the terrestrial and aquatic system allowed to conclude that the water qualitydegradation is closely connected to both land use and land cover changes in the drainagebasin and to the population growth. Other important finding was that the pollution potentialis not homogenous throughout the drainage basin, and that therefore, the pollution controlpolice must be focused in more critical areas, where the degradation is more intense.
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