Modelagem hidrodinâmica e avaliação do decaimento do fósforo em um lago urbano hipereutrófico

Abstract

This study aimed to analyze the hydrodynamics of a hypereutrophic urban lake located in Fortaleza‐CE, Brazil, applying the 2D modeling software CE‐QUAL‐W2, as there is a lack of these studies on the Northeast region of Brazil. Field data along with literature available information were used to insert lake information on the model, so the scenarios for rainy and drought periods were performed for velocity, temperature and residence time (RT). Time series for RT and phosphorus decay rate (K) were performed and compared to the results found using the complete mixing approach. The modeling outcomes showed RT values on the range from 8 to 80 days, with higher values obtained for the dry season, as expected. It was also observed a slight thermal stratification for the dry season, which reduces for the rainy season. This scenario was corroborated by the results regarding the RT. Finally, when the RT and K values obtained with the 2D model were compared to the ones obtained with the complete mixing approach, it was found that this is a good approximation for this reservoir.