Título:	Comparação entre os modelos SEBAL e SSEBop na estimativa da evapotranspiração do trigo no Cerrado
Autor(es):	Vale, Bianca Soares do
E-mail do autor:	biancavale01@gmail.com
Orientador(es):	Roig, Henrique Llacer
Assunto:	Evapotranspiração Cerrados Trigo Recursos hídricos Trigo - cultivo
Data de publicação:	31-Mar-2023
Data de defesa:	17-Dez-2021
Referência:	VALE, Bianca Soares do. Comparação entre os modelos SEBAL e SSEBop na estimativa da evapotranspiração do trigo no Cerrado. 2021. 133 f., il. Dissertação (Mestrado em Geociências Aplicadas) — Universidade de Brasília, Brasília, 2021.
Abstract:	The expansion of agricultural frontiers in the Cerrado associated to the growth of the irrigated area intensifies conflicts over the use of water, which becomes even more significant in a region that already faces a shortage of water resources. In hydrographic basins where irrigated agriculture predominates, it is essential to understand the temporal and spatial variation of the real evapotranspiration of a crop (ETR), for a more assertive management of water resources. Models that apply remote sensing data allow ETR mapping with a greater spatial coverage. Considering the productive potential of winter wheat in the Cerrado, this study aims to estimate the water demand required by the wheat crop in the agricultural years of 2018 and 2019 through the application of the SEBAL and SSEBop algorithms. The performances of the remote sensing models were evaluated by comparing the results with the Bowen ratio (RB) method. On a daily scale, SEBAL was able to represent 86% of the ETR variations with an underestimate of -0.26 mm d-1 and RMSE of 0.50 mm d-1, or 9.66%, presenting a good performance with a coefficient efficiency (E) of 0.75. Compared to field data, the SSEBop model performed even more satisfactorily, representing 95% of the ETR variability in 2018, with an underestimate of -0.05 mm d-1 and RMSE of 0.25 mm d-1 or 4.76%, affirming the good performance with E of 0.93. Considering that the cultivation of wheat in 2018 was more influenced by the advective effect of the wind in the field, the water dephts accumulated during the cycle by RB, SEBAL and SSEBop were 467.15 mm, 451.56 mm e 461.72 mm, respectively. In the 2019 wheat crop cycle, the SEBAL model had a satisfactory performance with R² of 0.72, underestimating the field data by -0.15 mm d-1, with RMSE of 0.42 mm d-1, or 10.55% and E of 0.68. The SSEBop maintained its good performance representing 78% of the ETR variation in the field, with an overestimation of 0.16 mm d-1, RMSE of 0.41 mm d-1 or 10.32% and E of 0.69. The water demand of wheat in 2019 by the RB was 419.63 mm, the SEBAL accumulated 421.08 mm and the SSEBop 422.61 mm. In the two evaluated wheat crop cycles, both models presented satisfactory performance. However, the SSEBop model was able to better represent the ETR variability for the wheat crop under cerrado conditions, and considering the lower degree of operational complexity, it becomes the most recommended model under these conditions.
Unidade Acadêmica:	Instituto de Geociências (IG)
Informações adicionais:	Dissertação (mestrado) — Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geociências Aplicadas, 2022.
Programa de pós-graduação:	Programa de Pós-Graduação em Geociências Aplicadas e Geodinâmica
Licença:	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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