Accuracy evaluation of twenty empirical models in estimating coastal regions reference evapotranspiration in different climate

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GHORBANI KH.; ALIGHOLINIA T.; RASOULI MAJD N.

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Journal: Journal of Water and Soil Conservation Year:2018 | Volume:25 | Issue:4 Page(s): 307-320

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Title

Accuracy evaluation of twenty empirical models in estimating coastal regions reference evapotranspiration in different climate

Author(s)

GHORBANI KH. | ALIGHOLINIA T. | RASOULI MAJD N. | Issue Writer Certificate

Keywords

Coastal regionsQ2

Empirical methodsQ1

FAO-Penman-MonteithQ2

Reference evapotranspirationQ1

Abstract

Background and Objectives: Measurement of evapotranspiration using weighing lysimeter is the most accurate method. However, due to the gravitational fabrication of the weighing laser, simple Empirical methods are widely used for calculating potential transpiration evapotranspiration and their results were compared with reference (FAO-Penman-Monteith) method. Therefore, the main objective of this study is to compare the accuracy of 20 experimental models of Reference evapotranspiration estimation and providing the best experimental method in the cities of Rasht, Sari and Gorgan in northern Iran and in the coastal strip of the Caspian Sea. Materials and Methods: In this study a cross comparison of FAO-Penman-Monteith method and 20 empirical equations was done for calculating potential evapotranspiration in a period of 10 years from 2007 to 2016, in Rasht, Sari and Gorgan synoptic stations in coastal zone of Caspian Sea. These stations were selected for climatic variation from humid climates to Mediterranean climates. The Root mean squared error (RMSE), Mean Absolute Error (MAE) and Percent error (PE) were used to measure accuracy of these methods. Results: The results showed that daily evapotranspiration values obtained from Ravazzani method were closer to FAO-Penman-Monteith method than those of the other models. So that for the model, the measured errors involve RMSE, MAE and PE, were obtained 0. 77, 0. 54 (mm/day) and 21. 6% for Rasht, 0. 8,-0. 39. (mm/day) and 9. 4% for Sari and 0. 99,-0. 42 (mm/day) and 9. 88% for Gorgan. Also, the results indicate a low performance of the Romanenko model. Overall, in all of the studied climates, the Ravazzani et al., Berti et al., Hargreaves-Sammani, Irmak et al. and Valiantzas models had better performance than other models in the estimation of Reference evapotranspiration Conclusion: The results of this study showed decrease in the accuracy of ET models compared to reference model of FAO-Penman-Monteith for moving from humid to Mediterranean climate. The mass transfer based models like Mahringer and Tabari showed relative undesirable efficiency in coastal zone. Therefore, it can be noticed that empirical equation can lead to variable efficiency in different climate.

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APA: Copy

GHORBANI, KH., ALIGHOLINIA, T., & RASOULI MAJD, N.. (2018). Accuracy evaluation of twenty empirical models in estimating coastal regions reference evapotranspiration in different climate. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 25(4 ), 307-320. SID. https://sid.ir/paper/156023/en

Vancouver: Copy

GHORBANI KH., ALIGHOLINIA T., RASOULI MAJD N.. Accuracy evaluation of twenty empirical models in estimating coastal regions reference evapotranspiration in different climate. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2018;25(4 ):307-320. Available from: https://sid.ir/paper/156023/en

IEEE: Copy

KH. GHORBANI, T. ALIGHOLINIA, and N. RASOULI MAJD, “Accuracy evaluation of twenty empirical models in estimating coastal regions reference evapotranspiration in different climate,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 25, no. 4 , pp. 307–320, 2018, [Online]. Available: https://sid.ir/paper/156023/en

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