Dhr. A.H. (Heriberto) de Castro Teixeira: “Measurements and modeling of evapotranspiration to assess agricultural water productivity in basins with changing land use patterns: a case study in the São River Francisco Basin, Brazil”

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21 Oct 2008 13:30
Unit: Wageningen University
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen
Organisation: Wageningen University
Promotor: Prof.dr. W.G.M. Bastiaanssen (TU Delft/WaterWatch)
Co Promotor: Prof.dr.ir. M.G. Bos

 The São Francisco River basin in Brazil is marked by socio-eco¬nomic disparities and environmental vulnerabilities. Water managers in the semi-arid region of the basin are faced with several challenges. Because of the importance of agricultural water management on basin hydrology, daily and seasonal actual evapotranspiration were measured in irrigated orchards, along with experimental data collection over natural savannah ecosystems. Advanced radiation and energy balance measurements were conducted using the Bowen ratio and eddy correlation energy balance methods. The field results have been further used to calibrate and validate an existing remote sensing algorithm for the estimation of spatially distributed energy balance fluxes: the Surface Energy Balance Algorithm for Land (SEBAL). After calibration, the SEBAL algorithm has been applied to determine regional scale evapotranspiration and biomass production. The economic water productivities indicated that irrigated fruit crops have around 20 times more value per unit water consumed than other irrigated arable crops.
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