Evapotranspiração regional utilizando o SEBAL em condições de relevo montanhoso

• Ano de defesa: 2006
• Autor(a) principal: Menezes, Sady Júnior Martins da Costa de
• Orientador(a): Sediyama, Gilberto Chohaku
• Banca de defesa: Martinez, Mauro Aparecido , Ramos, Márcio Mota , Oliveira, Rubens Alves de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Engenharia Agrícola
• Departamento: Construções rurais e ambiência; Energia na agricultura; Mecanização agrícola; Processamento de produ
• País: BR
• Palavras-chave em Português: Sensoriamento remoto; Balanço de radiação e energia; Evapotranspiração
• Palavras-chave em Inglês: Remote sensing; Energy and radiation balance; Evapotranspiration
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::ENGENHARIA DE AGUA E SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/3610

SEBAL Surface Energy Balances Algorithms for Land - is an algorithm for creation of evapotranspiration maps for large areas. SEBAL is processed through steps to predict a complete solar radiation and energy balance on the Earth surface. It uses images collected by TM Landsat sensor or any other sensor that collect wavelengths in the region of the reflective infrared and thermal bands. The present work was carried out to estimate the components of the solar radiation balance and the surface energy (sensible heat flux; soil heat flux and latent heat flux); to determine the instantaneous (hourly) evapotranspiration in the area of study through the use of the SEBAL algorithm and the tools of the remote sensing for images of flat terrain conditions and mountainous relief, using the topographical normalization and to compare them with the values estimated by SEBAL with the values obtained from the climatological station data through the REF-ET program - Reference Evapotranspiration Calculation Software. In the area in study were obtained a scene of the TM Landsat 5 sensor, for the dates of 20/06/2003, 24/09/2003 and 22/06/2004. The used images areas are composed by seven spectral bands. The values found for the radiation balance, soil heat flux, sensible heat and latent heat fluxes were consistent to the values found in the literature. The values estimated by SEBAL compared to the values obtained from the climatological station accompanied the tendency, but with smaller values for the month of June in relation to September, and the values of hourly evapotranspiration differed as for the employed methods for it estimate (REF-ET and SEBAL). It is recommended to make studies of the input variables in the process of calculations with field data for validation and to obtain an algorithm that supplies data for actual evapotranspiration with more reliability and precision.