Balanço de Energia à Superfície em Áreas de Cultivo de Cana-de-Açúcar e Cerrado no Estado de São Paulo através de Algoritmos de Sensoriamento Remoto (Surface energy balance over heterogeneous areas through remote sensing algorithms)
DOI:
https://doi.org/10.5935/1984-2295.20170028Keywords:
Balanço de energia, S-SEBI, SEBAL, desmatamento, região heterogêneaAbstract
O objetivo deste estudo é a validação do balanço de energia estimado através do algoritmo S-SEBI sobre uma região heterogênea (composta por Cerrado e Cana-de-açúcar), utilizando-se dados micrometeorológicos e o algoritmo SEBAL para uma intercomparação. Também foram analisadas as alterações decorrentes da substituição da vegetação nativa por cana-de-açúcar. Para a realização desta pesquisa utilizou-se sete imagens orbitais do TM Landsat 5, na órbita 220 e ponto 75, nas datas de 22/02, 11/04, 29/05, 14/06, 01/08 e 21/11, do ano de 2005, as quais a área estudada está inserida e que localiza-se no município de Santa Rita do Passa Quatro, no Estado de São Paulo. Os resultados demonstraram que ambos os algoritmos realizam estimativas similares para o saldo de radiação, as quais estão relativamente próximas da realidade. Tratando-se dos fluxos de calor sensível e latente, os algoritmos não revelam alta destreza em estima-los e diferem quando intercomparados. Ressalta-se que ambos os algoritmos foram desenvolvidos para utilização em áreas áridas ou semiáridas, isto reflete as dificuldades inerentes à realização da estimativa de balanço de energia em terrenos heterogêneos.
A B S T R A C T
This study aimed the validation of the estimated energy balance provided by S-SEBI algorithm over a heterogeneous region (covered by Cerrado and sugar cane), using micrometeorological data and the output from SEBAL for an intercomparison. The modifications in the atmospheric parameters provoked by the deforestation were analyzed as well. Were used, as input for the algorithms, seven TM- Landsat 5 images, in the orbit 220 and point 75, generated in February 22, April 11, May 29, June 14, August 01 and November 21, 2005. They contain the studied sites, situated in the municipality of Santa Rita do Passa Quatro, in São Paulo state. The results showed that both algorithms perform similar and relative good estimates for net radiation. In the case of latent and sensible heat fluxes, the algorithms do not show dexterity in estimate them and differ greatly when intercompared. S-SEBI has proved itself as a useful tool in the aforementioned context; it should be emphasized that both algorithms were developed for using in arid or semi-arid areas, what reflects the difficulties inherent in the implementation of the energy balance estimation in heterogeneous areas.
Keywords: energy fluxes, S-SEBI, SEBAL, deforestation, heterogeneous region.
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Copyright (c) 2017 Vinícius Gomes Costa Junior, Carlos Antonio Costa, Thiago Luiz do Vale Silva
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