Made available in DSpace on 2014-12-17T14:01:58Z (GMT). No. of bitstreams: 1 ThiagoPNM.pdf: 364395 bytes, checksum: d196df37d1feef6ed3e5d5cd9f931834 (MD5) Previous issue date: 2009-02-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The eutrofization is a natural process of accumulation of nutrients in aquatic?s body that it has been accelerated for the human?s actives, mainly the related with the activities of camp, industrial and the inadequate disposition of the domestic sewage. The enrichment of the aquatic?s body with nutrients, mainly the nitrogen and the phosphorus, and the consequent proliferation of algae and Cyanobacteria can commit the quality of the water for the public provisioning, for the fish farming and for other ends. The problem becomes more critical when there is a shortage of water naturally as in the semi-arid area of the Brazilian northeast. Before that problem this work had as objective evaluates the trophic state of six reservoirs of the basin of River Serid? of Rio Grande of Norte and also estimate the capacity of load of match of the reservoir and risk probabilities based on the established limits by the resolution Conama 357/05. The results demonstrate that the six reservoirs are eutrofization, with concentration of total phosphorus and cloro a in the water upster to 50 e 12 μg l-1. The results show that space homogeneity exists in the state trophic of the reservoirs, but a significant variation interanual in function of the increase of the concentrations of nutrients and decrease of the transparency of the water with the reduction of the body of water accumulated in the reservoirs.The results of the simulation risk estocastic show that the reservoirs could receive annually from 72 to 216 Kg of P, assuming a risk of 10% of increasing in more than 30 μg l-1 the annual medium concentrations of total match in the water of these reservoirs. This load could be high in until 360 kg of P a year in case the managers assume a risk of 10% of increasing in more than 50 μg l-1 the annual medium concentrations of total phosphorus in the waters of these reservoirs / A eutrofiza??o ? um processo de ac?mulo de nutrientes em ambientes aqu?ticos que tem sido acelerado pelas atividades antr?picas, principalmente as relacionadas com as atividades agropastoris, industriais e a disposi??o inadequada dos efluentes dom?sticos. O enriquecimento do ambiente aqu?tico com nutrientes, principalmente o nitrog?nio e o f?sforo, e a conseq?ente prolifera??o de algas e cianobact?rias podem comprometer a qualidade da ?gua para o abastecimento p?blico, para a piscicultura e para outros fins. O problema se torna mais cr?tico quando h? naturalmente uma escassez de ?gua como na regi?o semi-?rida do nordeste brasileiro. Diante dessa problem?tica este trabalho teve como objetivo avaliar o estado tr?fico de seis reservat?rios da bacia do Rio Serid? no Rio Grande do Norte e tamb?m mensurar a capacidade de carga de f?sforo dos reservat?rios visando o seu enquadramento segundo a resolu??o CONAMA 357/05. Os resultados demonstram que os seis reservat?rios encontram-se eutrofizados, com concentra??es de f?sforo total e clorofila a na ?gua superiores a 50 e 12 ?g l-1 respectivamente. Os resultados mostram que existe uma homogeneidade espacial, mas uma significativa varia??o interanual no estado tr?fico dos reservat?rios em fun??o das varia??es do volume de ?gua acumulado nos reservat?rios. Os resultados da simula??o estoc?stica de risco mostram que os reservat?rios com maior capacidade de carga poderiam receber anualmente at? 216 Kg de P, assumindo um risco de 10% de aumentar em mais de 30 ?g l-1 as concentra??es m?dias anuais de f?sforo total na ?gua destes reservat?rios. Esta carga poderia ser elevada em at? 360 kg de P por ano caso os gestores assumam um risco de 10% de aumentar em mais de 50 ?g l-1 as concentra??es m?dias anuais de f?sforo total nas ?guas destes reservat?rios