Acoplamento de modelos e o impacto da hidrologia na hidrodinâmica de um lago raso

Abstract

Integrated basin-lake modeling can be an essential tool to analyze different processes and responses in hydrodynamics. This work aimed to analyze the impact of hydrological extremes on the hydrodynamics of a shallow lake, located in Fortaleza, Ceará, Brazil. For this purpose, the Storm Water Management Model (SWMM) and the two-dimensional hydrodynamic model CE-QUAL-W2 were used. Three years were selected, according to the rainfall characteristics, of a 20-year time series: 2013 (dry), 2018 (typical) and 2019 (rainy). After calibrating and validating the models, the hydrological simulation was performed in the SWMM and the flow time series was coupled to the CE-QUAL-W2 model. There was a slight variation in the hydrodynamic characteristics with the increase in annual precipitation, such as the increase in the average water temperature (comparing 2013 and 2019) and a decrease in the hydraulic residence time. These trends are also observed when analyzing the seasonality (rainy and dry period), except for the water temperature in the years 2018 and 2019. A statistically significant correlation between precipitation and the hydraulic residence time was also obtained (R² of 0.79), pointing to the predominance of the influence of the inflow in the shallow lake hydrodynamic patterns.