LOPES, G. M.; http://lattes.cnpq.br/6916803941615951; LOPES, Gláucia Miranda.
Resumo:
The main objective of the present study was the determination of the balance
radiation at surface, based on seven spectral bands o f Landsat 5 - Thematic Mapper.
Two images, taken on December 04, 2000 and October 04,2001, involving irrigated
areas o f Nilo Coelho Project, part o f the Sobradinho Lake, native vegetation areas and
part of the urban areas o f Petrolina, PE and Juazeiro, BA, were considered. It was
applied the Surface Energy Balance Algorithm for Land - SEBAL, proposed by
Bastiaanssen (1995), in order to calculate the albedo and the land surface temperature
for each pixel o f the images. The incoming short wave radiation and the incoming
long wave radiation were assessed by data from a weather station. In general, the
radiation balance of the scene as a whole was larger in 2000, when it reached an
aerial average value of 615.0 W.m"2 . In 2001, the averaged Rn value reached 583.9
W."2, although in some selected areas within the studied scene, Rn in 2001 was larger
than the one of2000. It might be caused by occurrence of some rainfall events in the
area studied on December of 2000. That would have affected the albedo and the land
surface temperature mainly in the non-irrigated areas. The results obtained in
irrigated orchards, when compared with other studies, show that the approach is
confidant and have great importance.