Estimation of Actual Evapotranspiration of Pasture Plants using SEBAL Algorithm (Research-Case Study: Ahar County)

Document Type : Research-Case Study

Authors

Jalal Golreyhan ¹

Karim Amininia ²

Khalil Valizadeh Kamran ³

¹ PhD student of Climatology, Ahar Branch, Islamic Azad University, Ahar, Iran

² Assistant Professor of Climatology, Department of Geography, Faculty of Humanities, Ahar Branch, Islamic Azad University, Ahar, Iran

³ Professor, Department of Remote Sensing and GIS, Faculty of Planning and Environmental Sciences, Tabriz University, Tabriz, Iran

https://doi.org/10.22067/jgrd.2023.82588.1291

Abstract

This study tried to calculate the actual evapotranspiration rate of thyme, mint, and alfalfa pastures using the SEBAL method in the Ahar region, which is located in the south of Arsbaran forests and has numerous pastures of different species. For this purpose, 6 Landsat-8 satellite images (between 2017 and 2020), belognig to early and late period of growth, were used. The results were compared with the findings obtained by Penman-Monteith method. The results showed that, based on the SEBAL method, the mint crop had the lowest rate of evapotranspiration in the initial period of crop growth on 2021/5/29, with a numerical value of 2.84 mm per day, and the alfalfa crop also in the initial crop growth period on 2019/6/11 had the highest rate of evapotranspiration with a numerical value of 3.49 mm per day. Moreover, in the final period of growth in the SEBAL method, the mint crop on 2018/8/28 had the lowest rate of evapotranspiration with a numerical value of 6.18 mm per day, and the thyme crop had the highest evapotranspiration rate in the final product growth period on 2022/7/19, with a numerical value of 7.41 mm per day. Finally, based on the comparisons made between the studied methods in the early and late periods of growth in terms of square-mean error, mean absolute deviation, and coefficient of determination, it can be concluded that the SEBAL method compared to the Penman-Monteith method has an acceptable error rate (RMSE of 0.717, MAD of 0.658, and the coefficient of determination of 0.84 mm per day).
 

Keywords

Evapotranspiration

SEBAL

Pasture

Water requirement

Ahar County

Subjects

• Natural geography and environmental planning

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