Avaliação da dinâmica temporal da evaporação no reservatório de Itumbiara, GO, utilizando dados obtidos por sensoriamento remoto/Assessment of temporal dynamics of evaporation in the Itumbiara reservoir, GO, using remote sensing data

• Published in: Revista ambiente & água 2013-01, Vol.8 (1), p.272
• Main Authors: Curtarelli, Marcelo Pedroso, Alcântara, Enner Herenio, de Araújo, Carlos Alberto Sampaio, Stech, José Luiz, Lorenzzetti, João Antônio
• Format: Article
• Language: Portuguese
• Subjects: Evaporation; Fluid mechanics; Reservoirs
• ISSN: 1980-993X

The object of this work was to study the dynamics of evaporation in the Itumbiara reservoir, located in Central Brazil, using MODIS-derived water surface temperature (product MOD11A1) and meteorological data acquired over the water surface. The evaporation rates were derived from latent heat flux, estimated through a mass transfer model. The estimates were carried out for the period between 1/1/2010 and 31/12/2010. The results showed that evaporation rate tends to increase from January to September and then decrease from September to December. The evaporation rate reached values near 20 mm day^sup -1^ in Itumbiara reservoir during the dry season in 2010. The mean evaporation rate for the wet season was 3.66 mm day^sup -1^ and 8.25 mm day^sup -1^ for the dry season. The total water volume evaporated from Itumbiara reservoir during 2010 was estimated at about 1.7 billion m^sup 3^ (2,300 mm) which represents 10% of total reservoir volume. The results suggest that advection is the main transport mechanism which drives the evaporation in Itumbiara. The convective processes contribute secondarily to evaporation in Itumbiara reservoir. [PUBLICATION ABSTRACT]