Impacto da variabilidade hidroclimática na hidrodinâmica de um reservatório urbano em Fortaleza/CE

Abstract

In view of the lack of studies on reservoir hydrodynamics using dynamic models in northeastern Brazil, the objective of the present study was to carry out an assessment of the region's climate history, analyze the impact of evaporation on residence time (RT) and evaluate the influence of climatic conditions in the hydrodynamic forcing related to the water quality of the Santo Anastácio reservoir (ASA), located in Fortaleza / CE, using 2D hydrodynamic and water quality model CE-QUAL-W2. The purpose of this study was also the elaboration of a manual to carry out the analysis of the data generated by the model. Meteorological data from the region were used to insert the information regarding the studied lake, and then the observation of the climatic history was carried out and the rain-flow model for the region was developed, proceeding to the desired simulations for the years 2009 to 2018. There was a considerable difference in evaporation in the TR when the coefficients of the wind equation calibrated for the region under study, mainly in the second half of the year (dry period). The results showed a clearer response of the TR when evaluating seasonality, with an increase of between 2 and 3 times from the rainy to the dry period. The interannual variability influenced the TR less significantly and only in the years when the precipitations were well below the Thus, we concluded the relevance in considering the evaporation calculated with the wind equation adjusted for the region and the notability of the seasonal variability of the TR in comparison with its interannual variation.