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• W3136210837 abstract "Evapotranspiration (ET) is a dominant hydrologic loss flux in the water budget of arid andsemi-arid areas. Thus, accurate estimation of its dynamics is critical for assessing wateravailability and improving water resources management in such areas. In this study thephysically-based Surface Energy Balance System (SEBS) model was applied to estimatespatio-temporal variability of actual ET (AET) in the semiarid Barotse basin, South-WesternZambia. The model was run using atmospherically rectified MODIS satellite imagery onclear-sky warm-wet, cool-dry and hot-dry days. Furthermore, based on sunshine hours anddaily AET, monthly fluxes were generated. The outputs were evaluated against potential ET(PET) and independently modelled AET from the global circulation model of the EuropeanCentre for Medium-range Weather Forecast (ECMWF). It was observed that the ratio ofAET to PET at the reference station was in the order of 1.04, 0.64 and 0.30 on warm-wet,cool-dry and hot-dry days respectively. Systematic lack of physical agreement on warm-wetdays suggested that SEBS estimates were not necessarily implausible but that assumptionson which PET is based differed from surface conditions. ECMWF estimates were in betteragreement with SEBS at daily and monthly time-steps at Sesheke station than at Kamanga.This was ascribed to input data and vegetation index-based roughness parametrisation.Sensitivity analysis of the model to landuse-based versus NDVI aerodynamic roughnessrevealed a reduction of fluxes of up to 1.5 mm day-1 on forests using the latter. Flux analysisshowed that water bodies and regularly flooded vegetation had the highest rates of 6.9 and5.9 mm day-1 on warm-wet days respectively. The lowest occurred on croplands andgrasslands with a high variation between warm-wet and hot-dry days of up to 64.1 and71.1% respectively. It is concluded that SEBS model can accurately estimate AET inheterogeneous areas with spatial input data and robustly determined roughness values." @default.
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• W3136210837 date "2014-01-01" @default.
• W3136210837 modified "2023-09-26" @default.
• W3136210837 title "Estimation of Spatio-Temporal Variability of Actual Evapotranspiration Using the Sebs Model in the Semiarid Barotse Basin, South-Western Zambia" @default.
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