Estimativa da evapotranspiração e do balanço hídrico a partir de imagens de satélite de duas sub-bacias do Paracatu

• Ano de defesa: 2010
• Autor(a) principal: Lima, Evaldo de Paiva
• Orientador(a): Sediyama, Gilberto Chohaku
• Banca de defesa: Hamakawa, Paulo José , Andrade, Ricardo Guimarães
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Meteorologia Agrícola
• Departamento: Agrometeorologia; Climatologia; Micrometeorologia
• País: BR
• Palavras-chave em Português: Evapotranspiração; Balanço hídrico; Sensoriamento remoto; Recursos hídricos
• Palavras-chave em Inglês: Evapotranspiration; Water balance; Remote sensing; Water resources
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::AGROMETEOROLOGIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1499

In this study, we used the Surface Energy Balance Algorithm for Land (SEBAL) algorithm, along with products obtained by the Moderate-Resolution Imaging Spectroradiometer (MODIS) sensor aboard the Terra satellite to estimate the energy balance components, evapotranspiration and water balance components for the climatic conditions of sub-basins of the Entre Ribeiros and Rio Preto rivers. In this way, daily instantaneous energy balance and evapotranspiration components thematic maps were prepared for 12 days, each representing average ten days periods, during July thru October 2007. After the estimation of daily evapotranspiration rates, the results were extrapolated into ten days periods. Thus, the results of the water balance components (balance of rainfall, runoff and soil water storage) were estimated for that time interval. Although the energy balance components were not measured by an automatic weather station within the limits of the sub-basins under study, the results of these components found through SEBAL were consistent with those cited in the literature, in various localities. Despite the results of daily evapotranspiration found for the bean crop, SEBAL could still be used as a good option to determine the daily evapotranspiration rates, using products from the MODIS sensor. To do this, works should be carried out for larger areas that have the same type of coverage. Most of the study period the precipitation balance was negative, indicating the occurrence of a dry periods in the region, and due to a lack of rainfall the surface runoff was not significant during the ten days periods of July, August and September. The use of remote sensing techniques to estimate evapotranspiration, the energy balance components and water balance is an alternative, especially for areas where weather data are limited, which is found in the sub-basins of the Entre Ribeiros and Rio Preto rivers.