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O objetivo desta pesquisa foi elaborar o mapa de uso e ocupacao da bacia do rio Nhapindazal por meio de tecnicas de processamento e classificacao digital de imagens orbitais e buscar relacoes com as analises de qualidade da agua obtidas em duas campanhas em diferentes locais da bacia, identificando-se os agentes poluidores. Foram utilizadas imagens de cinco metros de resolucao espacial e o processo de classificacao por regioes considerando dois parâmetros para classificacao de imagens: limiar de similaridade e area minima. Foram realizadas duas campanhas de coleta de agua para analise em oito pontos estrategicos da bacia, sendo que em cada amostra coletada foi caracterizada para os seguintes parâmetros: pH, turbidez, fosforo total, Demanda Bioquimica de Oxigenio (DBO), Oxigenio Dissolvido (OD), Solidos Totais (ST), Solidos Suspensos Totais (SST), Solidos Dissolvidos Totais (SDT), coliformes totais e Escherichia coli. Os resultados demonstraram que alteracoes observadas nos valores dos parâmetros de qualidade da agua possuem em alguns locais, relacao com as acentuadas modificacoes do uso e ocupacao da bacia nos ultimos anos. Abstract The objective of this research was to draw a map of use and occupation of the Nhapindazal River Basin, through processing techniques and digital classification of satellite images. The study also aimed at seeking for correlations between the images and the analysis of water quality obtained during two campaigns in different areas of the basin, identifying the pollutants. The images used were of 5 meters spatial resolution, and the process of classification by regions considered two parameters for image classification: similarity threshold and minimum area. Two campaigns were conducted to collect water for analysis in eight strategic points of the basin, and each collected sample was characterized in relation to the following parameters: pH, turbidity, total phosphorus, biochemical oxygen demand (BOD), Dissolved Oxygen (DO), total Solids (TS), Total Suspended Solids (TSS), total Dissolved Solids (TDS), total coliforms and Escherichia coli. The results showed that, in some places, the observed changes in the values of the water quality parameters are related to the marked changes in the use and occupation of the basin in recent years.

ambiência

Impacto do uso e ocupação da terra na qualidade da água da bacia hidrográfica do rio Nhapindazal, Irati (PR) / Impact of land use and occupation on the water quality of Nhapindazal river watershed, Irati, (PR)