What is it about?
The conventional Penman-Monteith Equation ignores the minor terms of energy while taking into account these terms can reduce reference (or actual) evapotranspiration up to 27%. We introduced an equation to estimate these minor components as a function of net radiation, air temperature, and Monin–Obukhov length, or simply a function of daily net radiation.
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Why is it important?
Penman-Monteith equation is one of the most important evapotranspiration (ET) equations which the majority of hydrologists in the world apply. Therefore, its precise estimation plays a crucial role in ET estimation. Even though its importance is recognized, the equation ignores the contribution of minor components of energy in the available energy term. Our paper focuses this issue, and introduce two formulae for the contribution of these terms.
Perspectives
Writing this article was a great pleasure for me. It's been almost 70 years that has passed when Penman introduced his equation for the first time, and no significant modification has imposed so far. But I changed it after 70 years.
Arman Varmaghani
The University of Iowa
Read the Original
This page is a summary of: Modification of FAO Penman–Monteith equation for minor components of energy, Hydrology Research, December 2018, IWA Publishing,
DOI: 10.2166/nh.2018.093.
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