Disponível on-line no endereço www.igc.usp.br/geologiausp -99 -Resumo Os principais aspectos da influência antrópica na carga dissolvida fluvial foram avaliados no rio Piracicaba para as principais espécies químicas inorgânicas dissolvidas e caracterizadas em termos de cargas totais. Foi possível observar as curvas de distribuição das concentrações dessas espécies químicas em função do tempo e compará-las com os respectivos modelos de diluição teórica, permitindo assim a identificação dos aportes pontuais e difusos predominantes na bacia de drenagem. Palavras-chave: Efluentes urbanos brutos; Carga dissolvida; Rio Piracicaba.
AbstractThe anthropogenic influence in Piracicaba river dissolved load were studied for major inorganic chemical species and characterized in terms of total loads. The concentration distribution curves, in function of time, were compared with respective theoretical dilution, what allowed the identification of punctual and diffuse contributions in the drainage basin. The dissolved chemical loads transported in these surface waters were calculated by stochastic method, and they were more significant for HCO 3 -, Na + and SO 4 2-. Nitrogen species were the most significant rainwater contribution. The punctual contributions were mainly associated to raw urban sewage released without treatment, considering Na 2-and part of HCO 3 -species. The diffuse contributions were related to rainwater, soil cultivation and rocks weathering contributions.
Trivelin, pela amizade e apoio. Ao Centro de Energia Nuclear na Agricultura (CENA/USP) pela possibilidade da realização do mestrado e a todo corpo docente pelos importantes ensinamentos.
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