ESTIAGEM E ALTERAÇÕES DAS FUNÇÕES HIDROLÓGICAS: O CASO DO RESERVATÓRIO DE ATIBAINHA
DOI:
https://doi.org/10.11606/issn.2179-0892.geousp.2011.74239Keywords:
Afforestation, Deforestation, Dry period discharge, Environmental impacts.Abstract
This paper is a research result, which objective is to identify the relationship between the land use and water yield. The study area is the Atibainha watershed (140 km2) that, together with more 3 watersheds, water supply 13 million people in São Paulo and Campinas cities. The land use maps were derived from 1988, 1993, 1996, 2001 and 2008 Landsat scenes classification. The hydrological analysis were derived from 30, 45 60 and 75 daily discharge Absolute Minimum Flow analysis and total water year precipitation during 1986 and 2007 years. Linear regression analyses and non-parametric statistic test were used to identify the temporal changes in the discharge and precipitation trend. The results indicated that secondary Atlantic forest cover decrease from 38% to 21% and afforestation with Eucalyptos urophylla increase from 24% to 43%. The totals of annual precipitation showed significant downward trend (p-value < 0.001). During the same period, daily dry discharge presented a significance trend to decline in 30, 45, 60 and 75 consecutive dry days presenting a decrease to 61%, 56%, 55% and 60% respectively (p value <0.001). The results indicate that exist a water yield decrease trend during the dry season in the Atibainha watershed and this is directed related with the decreases in precipitation inputs.Downloads
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