Hugo Alexandre Soares Guedes

Monitoramento da qualidade da água do arroio São Lourenço/RS

Este estudo teve como objetivo identificar as possiveis fontes de poluicao do Arroio Sao Lourenco, bem como reduzir se possivel o numero de variaveis monitoradas. Para isso utilizou-se dados de qualidade da agua secundarios, neles empregou-se a estatistica multivariada atraves da analise de agrupamento. Por meio desta analise foi possivel retirar tres variaveis de qualidade da agua e identificar as possiveis fontes de poluicao existentes. Portanto conclui-se que atraves da analise de agrupamentos foi possivel retirar variaveis similares, auxiliando na reducao das analises laboratoriais para monitoramento da qualidade da agua, assim como, ao retirar as variaveis, houve a formacao de dois grupos homogeneos de variaveis limnologias facilitando assim a analise das possiveis fontes de poluicao.

Ecohydrological modeling and environmental flow regime in the Formoso River, Minas Gerais State, Brazil

This paper aimed at determining the environmental flow regime in a 1 km stretch of the Formoso River, MG, using River2D model. To carry out the ecohydrological modeling, the following information was used: bathymetry, physical and hydraulic features, and the Habitat Suitability Index for species of the Hypostomus auroguttatus. In the River2D, the Weighted Usable Areas were determined from the average long-term streamflows with percentage from 10% to 100%. Those streamflows were simulated for the later construction of optimization matrices that maximize the habitat area throughout the year. For H. auroguttatus Juvenile, higher values of Weighted Usable Area were associated with the percentage of 60% and 70% of the average long-term streamflows in October and September, respectively. For H. auroguttatus Adult, the highest value of Weighted Usable Area was associated with the percentage of 100% of the average long-term streamflow in September. The environmental flows found for this stretch of the Formoso River varied over the year. The lowest environmental flow was observed in December (2.85 m3 s-1), while the highest was observed in May (4.13 m3 s-1). This paper shows the importance of ecohydrological studies in forming a basis for water resources management actions.