Produção Nacional
Processos Hidrológicos e Hidrodinâmicos da Lagoa Mirim
2015; Brazilian Association of Water Resources; Volume: 20; Issue: 1 Linguagem: Inglês
10.21168/rbrh.v20n1.p34-45
ISSN2318-0331
AutoresHeline Oliveira, Elisa Helena Leão Fernandes, Osmar O. Möller Júnior, Gilberto Loguércio Collares,
Tópico(s)Water Quality and Pollution Assessment
ResumoThe Mirim Lagoon is located between southern Brazil and eastern Uruguay, and combined with the Patos Lagoon forms the largest lagoon complex of South America.These systems are connected with the Atlantic Ocean through a natural channel, called São Gonçalo Channel.The main objectives of this study are to characterize the hydrological variability of the main Mirim Lagoon tributaries, as well as to study the spatial and temporal variability of the main factors controlling the lagoon hydrodynamics.Based on water level time series and flow data, it was possible to estimate a freshwater discharge time series from the Mirim Lagoon towards the Patos Lagoon (for the period between 1stJanuary 2009 to 31stDecember 2011) and also produce a rating curve.The mean flow from the ML to the Patos Lagoon is 600 m 3 s -1 .The time series of the main tributaries of Mirim Lagoon (Cebollati, Tacuari and Piratini rivers) were also analyzed.A combination between an analytical model of slopes and freshwater discharge time series, indicated that the Mirim Lagoon hydrodynamics is modulated by two main factors: mainly by the river discharge of its tributaries, and secondly by the wind effect.The long-term water level variations indicate that ML acts as a large water reservoir.
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