Abstract
Mapping of spatiotemporal distribution of evapotranspiration becomes important for sustainable water management as water scarcity is nowadays a growing concern in almost all the continents. In general, researchers estimate evapotranspiration by multiplying the computed reference evapotranspiration (ETo) with the corresponding crop coefficient. Such estimation of ETo requires data related to spatiotemporal meteorological and vegetation field characteristics, and however, these data are rarely available in most developing countries such as India. Thus, researchers constantly develop various methods and evaluate the applicability of these methods to accurately capture spatiotemporal distribution. The purposes of this study are to (a) examine the applicability of Hargreaves and MODIS ETo method to map the spatiotemporal distribution over Thamirabarani basin located in Southern India and (b) evaluate the performances of Hargreaves and MODIS ETo methods and compare it to FAO 56 Penman–Monteith method. To achieve these purposes, ETo data of Hargreaves method and MODIS ETo method over Cheranmadevi meteorological observatory are extracted and performances of these methods are compared with FAO 56 Penman–Monteith method. Results show that a match exists among all the three ETo datasets, and no major deviations have been observed. However, this study suggests local calibration of Hargreaves and MODIS ETo method as considerable mismatch has been observed at ETo daily value. Overall, the conclusion of this study encourages the application of the Hargreaves method and MODIS ETo method in developing countries, where the data shortage condition prevails.
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Acknowledgements
The authors thank School of Civil Engineering, Vellore Institute of Technology, Chennai, Tamil Nadu, India, for providing infrastructure support to complete this research study. We are thankful to NASA Earth Observing System MODIS project for making USGS Earth explorer website freely accessible for researchers. The authors also thank anonymous reviewers for their suggestions to improve this manuscript.
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Dinagarapandi Pandi is mainly responsible for modelling, image processing, and writing the first draft of manuscript. Kothadaramanan Saravanan provided theoretical guidance and technical support. Mohan Kuppusamy extended his support for data collection and supervised the findings of this work. M. Birasnav provided constructive comments to improve the manuscript and editorial comments on the final draft report. All authors have read and approved the final manuscript.
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Pandi, D., Saravanan, K., Kuppusamy, M. et al. Performance evaluation of geospatially assisted reference evapotranspiration models. Arab J Geosci 15, 787 (2022). https://doi.org/10.1007/s12517-022-10019-3
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DOI: https://doi.org/10.1007/s12517-022-10019-3