SWAT Literature Database for Peer-Reviewed Journal Articles

Title:A Comparison of SWAT Model-Predicted Potential Evapotranspiration Using Real and Modeled Meteorological Data 
Authors:Earls, J., and B. Dixon 
Journal:Vadose Zone Journal 
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URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:evapotranspiration assessment 
Secondary Application Category:input effects 
Watershed Description:855 km^2 Charlie Creek basin in the middle to upper eastern Peace River basin in central Florida 
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Validation Summary: 
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Abstract:Adequate characterization of potential evapotranspiration on (PET) plays a critical role in hydrologic budgets, rainfall–runoff models, infiltration calculations, and drought prediction models (to name a few applications). The availability of reliable and continuous meteorological data remains a challenge; therefore, it is common to use modeled (simulated) meteorological data. This research used the Soil and Water Assessment Tool (SWAT) to estimate PET using different meteorological input data (simulated vs. real data) and the three commonly used PET calculation methods (viz. Penman–Monteith, Hargreaves, and Priestley-Taylor). The overall goal of this research was to determine the accuracy of prediction using simulated and real meteorological data when used with three PET calculation methods. Initial input layers to SWAT were: digital elevation models, soils, and land use. Real meteorological data were obtained from three local meteorological stations, whereas simulated meteorological data were generated by SWAT using one nearby national meteorological site. The model-predicted PET results were validated using independent PET measurements from Florida Automated Weather Network sites. The results of the study indicate that the difference in predicted PET between simulated (modeled) and real meteorology for a given PET calculation method is not significant; however, it is significant across the methods of PET calculation.