Evaluation of Evapotranspiration Using Satellite Images and SEBAL Algorithm (Case Study: Eastern Azerbaijan Province)

Document Type : Research Article

Authors

1 Ph.D. in Agricultural Climatology, Hakim Sabzevari University, Iran

2 Assistant Professor of Climatology, Hakim Sabzevari University, Iran

Abstract

Evaluation of evapotranspiration is one way to prevent water loss and to manage water resources. Therefore, in this study, an attempt has been made to calculate the actual evapotranspiration rate in the east of East Azerbaijan province using the SEBAL algorithm. For this purpose, first, based on two Landsat 8 satellite images dated 2017/08/22 and 2017/08/09, the values of Net radiation, soil heat flux, and sensible heat flux are estimated. Then, based on the difference, the amount of instantaneous heat flux was calculated and a 24-hour evapotranspiration was obtained for each image. Finally, the amount was compared with the values obtained from the Penman-Monteith method. Also, for processing and analyzing images ENVI4.8 software was used. The results indicated that the amount of evapotranspiration in the Penman-Monteith and SEBAL method on 2017/08/22 was about 6.15 and 7 mm per day, and on 2018/08/09, respectively, about 7.38 for Penman-Monty and 7.94 mm per day for SEBAL. Overall, the amounts of SEBAL actual evapotranspiration and Penman-Monteith potential evapotranspiration have a mean absolute difference (MAD) 0.705 mm per day which indicates that the estimated values are consistent with the SEBAL algorithm and the Penman-Monteith method.

Keywords

References

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Iranian journal of Ecohydrology
Volume 8, Issue 1
April 2021
Pages 17-27

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History

  • Receive Date: 12 August 2020
  • Revise Date: 20 December 2020
  • Accept Date: 20 December 2020

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