Evaluating the Strategy of Ensemble Empirical and Tree-Based Methods in Estimating Reference Evapotranspiration

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Mikaeili Fatemeh; Samadian fard Saeed; Delirhasannia Reza

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Journal: Environment and Water Engineering Year:2023 | Volume:9 | Issue:2 Page(s): 256-270

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Information Journal Paper

Title

Evaluating the Strategy of Ensemble Empirical and Tree-Based Methods in Estimating Reference Evapotranspiration

Author(s)

Mikaeili Fatemeh | Samadian fard Saeed | Delirhasannia Reza | Issue Writer Certificate

Keywords

combined method

Hargreaves-Samani

Kerman

Random forest

Sensitivity analysis

Abstract

In the present research, three data-driven models including M5P, REP tree, and Random forest were used to estimate daily reference evapotranspiration. The abilities of these three models to estimate reference evapotranspiration were studied in single and combined modes. To this end, the daily meteorological data of five synoptic stations in Kerman province in the period from 2000 to 2020 were used. A combination of meteorological variables, using Sensitivity analysis versus the reference evapotranspiration values obtained from FAO-Penman-Monteith, was considered as input for each of the mentioned models. Finally, the accuracy of the mentioned models and empirical methods in estimating the evapotranspiration of the reference plant were compared using statistical indicators, and the superior model was selected. The results of validation data showed that the M5P model in the form of individually (RMSE = 0.083 and NS = 0.998 in Bam station) and the weighted averaging in the form of the ensemble (RMSE = 0.155 and NS = 0.994 in Bam and Sirjan stations) in all stations had better results for estimating evapotranspiration rates than other methods. In general, tree models, especially M5P, had better results in estimating daily evapotranspiration than empirical models.

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