Impactos de um evento de seca prolongada na qualidade da água após esgotamento hídrico do reservatório Cruzeta, na Região Tropical Semiárida
Reservoirs are artificial ecosystems with different morphometric and hydrological characteristics, widely used in the Brazilian semiarid region to supply the local water scarcity. In the semi-arid region, water depletion of some reservoirs is recurrent during periods of prolonged drought, causing pr...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/37131 |
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| Resumo: | Reservoirs are artificial ecosystems with different morphometric and hydrological characteristics, widely used in the Brazilian semiarid region to supply the local water scarcity. In the semi-arid region, water depletion of some reservoirs is recurrent during periods of prolonged drought, causing problems for human supply, animal drinking and socioeconomic losses. After water depletion events, water quality improvement is expected to occur with the arrival of new waters. Therefore, the objective of this study was to evaluate the effects of the prolonged drought period on the water quality after the water depletion of the Cruzeta reservoir, in the semi-arid region of Rio Grande do Norte. The work was carried out in two different periods: 2012 (beginning of the prolonged drought period) and 2019 (after the water renewal). The drought period from 2012 to 2019 in the semiarid region contributed to significant changes in the water quality of the Cruzeta reservoir. The considerable reduction in the values of the variables turbidity, total solids, pH and electrical conductivity indicate an improvement in water quality after water depletion. However, despite the renewal of the waters, higher concentrations of total phosphorus and chlorophyll were found, which resulted in the change of the trophic state of the reservoir, from mesotrophic to eutrophic. The distinct behavior of the Cruzeta Reservoir in comparison with other studies indicates that, in order to assess the responses of extreme weather events, one must take into account the physical attributes of the reservoir, the hydrological and meteorological behavior and the characteristics of the basin, such as conditions sewage and drainage infrastructure. |
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