Estimating evapotranspiration by metric model over Çakit basin

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2019
Yanmaz, Denis Denizhan
Water availability is a topic of interest for many engineering fields. Hydrological cycle is the key to acknowledge the available water in a specific region. Evapotranspiration together with precipitation are the most impactful parameters of the hydrological cycle. A system gains water via precipitation and loses water due to evapotranspiration. Evapotranspiration is the process of water transfer from land to atmosphere by evaporation from soil and other surfaces and by transpiration from vegetation which can be defined as reference and actual evapotranspiration. In this study the main focus is the prediction of the water loss by actual evapotranspiration in a mountainous region. In addition, the reference evapotranspiration will be utilized for comparison with the results. The study region is the Çakıt basin located in south of Niğde province at the foot of Taurus mountains. In this study, actual evapotranspiration is mapped using Mapping EvapoTranspiRation with Internalized Calibration (METRIC) and R-METRIC models. Then, the estimations of the models are verified with the data obtained from an Eddy-Covariance flux tower that has been established. Both METRIC and R-METRIC models estimate seasonal trends adequately. However, the R-METRIC model yields closer results to the results of Eddy-Covariance flux tower than the METRIC model. Furthermore, the comparison with Eddy-Covariance method results is in good agreement with the models’ results, the Root Mean Square Error (RMSE) and the coefficient of determination (R2) between R-METRIC model results and Eddy-Covariance flux tower measurements are calculated as 1.33 mm/day and 0.79 respectively. Although, some fluctuations in data is present due to the inadequacy of Eddy-Covariance method in mountainous regions.

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Citation Formats
D. D. Yanmaz, “Estimating evapotranspiration by metric model over Çakit basin,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.