Limnological characterization and compartimentation of Ponte Nova Reservoir High Tietê River, São Paulo, Brazil - a contribution to management / "Caracterização limnológica e compartimentação do reservatório de Ponte Nova, Alto Tiête, SP - uma contribuição ao seu manejo"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Ponte Nova Reservoir is a component of SABESP?s Sistema Produtor Alto Tietê, with Jundiaí Taiaçupeba, Paraitinga e Biritiba-Mirim reservoirs. The system is responsible for the water supply of part of the Região Metropolitana de São Paulo. The aim of the present study was to verify the reservoir spatial and temporal behavior of the limnological variables, to establish its trophic conditions, and to make assessments concerning the management in order to contribute to the conservation of this environment. The field work of this project was undertaken during a period of 12 months, where monthly water samples were collected in stations established in the reservoir according to its morphometry, the entry of the main tributaries, Tietê and Claro rivers, and downstream the dam. Physical and chemical variables of the water and the concentration of total pigments in different depths along the vertical profile of the studied stations were determined, as well as of the water of the subsurface of tributaries and downstream of the dam. The obtained data was characteristic of an oligotrophic reservoir, as low concentrations of pigments and nutrients, and high transparency. In the other hand, the reservoir presented a well defined thermal and chemical stratiphication period, with great stability, in spite of the reduced residence time, characteristic of eutrophic environments, with high oxygen consumption demand in deeper waters. The observed spatial compartimentation, both along the longitudinal axis and the transversal axis at the maximum width, was determined mainly by the depth and by the entry of tributaries. The nutrient and suspended solids concentrations registered downstream were generally inferior to those registered at the main tributaries, indicating an efficient retention of the affluent (ou input) load to the reservoir, in spite of the inexistence of significative anthropogenic influences in the watershed. The reservoir management greatly influences its limnological behavior, and considerations concerning this matter were evaluated.

ASSUNTO(S)

3. management 2. reservoir 3. manejo 1. limnology 2. reservatório 1. limnologia

ACESSO AO ARTIGO

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