Evaluation of pan coefficient equations for estimating reference crop evapotranspiration in the arid region |
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| Authors: | Mohammad Mehdi Heydari Morteza Heydari |
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| Affiliation: | 1. Department of Water Engineering, Sciences and Research Branch, Islamic Azad University, Khouzestan, Iranmehdiheydari2010@yahoo.com;3. Department of Computer Engineering, Ashtian Branch, Islamic Azad University, Ashtian, Iran |
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| Abstract: | Reference evapotranspiration (ET0) can be estimated on basis of pan evaporation data (Epan), whose measurements have the advantage of low cost, simplicity of the measuring equipment, simple data interpretation and application as well as suitability for locations with limited availability of meteorological data. Epan values were converted to ET0 using the pan evaporation coefficient (Kpan). In this study, seven common Kpan equations were evaluated for prediction of ET0 in the growing season (April to October) in arid region of Iran. The Cuenca approach was best suited compared to the standard FAO Penman–Monteith method (FAO-56 PM). |
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| Keywords: | pan coefficient reference evapotranspiration FAO Penman–Monteith arid environment |
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