Curvas-chave de vazões líquidas em afluentes da margem direita do alto rio Teles Pires

Abstract

Water is a limited natural resource and essential for the maintenance of life on planet Earth. Therefore, the available water resources must be used rationally and efficiently. To determine the actual amount of water available in the water body, hydrological analyzes are developed, which monitor the surface flows of water courses, building a hydrometric database. Thus, the objective was to establish the main curves of net flow for fluviometric stretches of the Celeste, Nandico, Preto and Córrego Rosana rivers, located in the Alto Teles Pires region. The flow and water level data used were measured in the field in the watercourse control sections in the years 2019, 2020 and 2021. With the data base collected in the field, the parameters 𝑎, 𝑏 and ℎ0 of the key curves were defined using the solver tool. The best key curve traces were obtained with the following equations for Preto River (Q = 4.9249 (h - 0.20) 0.4004), Rosana stream (Q = 2.8607 (h - 0.25) 0 .6369), Nandico River (Q = 5.5688 (h - 0.0) 0.9498) and Celeste River (Q = 33.1442 (h - 0.05) 0.5130), with a high assertiveness values of R² all higher than 0.86. The key curves established for the control sections presented a good statistical performance in all sections and the behavior of the statistical indicators MBE, RMSE and d, are within the tolerable limits (less than 10% of the average net flow) for relations between flow and water level.