Temperature-and humidity-based simplified Penman’s ET0 formulae. Comparisons with temperature-based Hargreaves-Samani and other methodologies

John D. Valiantzas

Agricultural Water Management, 2018, vol. 208, issue C, 326-334

Abstract: This study introduces a new simplified Penman formulae for estimating reference evapotranspiration, ET0 (mm/d). The new formulae require maximum and minimum air temperatures and relative humidity or in addition local average wind speed. The new ET0 formulae is produced by simplifications to the previously developed by Valiantzas (2006, 2013a) simplified Penman expression that requires a complete set of meteorological data. A calibration based on measurements obtained from a global data base is used for the derivation of the formula. In addition, a relationship previously proposed by the author, connecting solar radiation to temperature and humidity is used. The new formula requiring maximum and minimum temperatures, Tmax (oC) and Tmin (oC) respectively, and humidity data, RH (%) is: ET0 = 0.0118(1-RH/100)0.2(Tmax-Tmin)0.3(Ra(T+10)0.5-40)+0.1(T+20)(1-RH/100)

Keywords: Penman equation; Evaporation; Evapotranspiration; Penman-Monteith; Irrigation scheduling hydrological models; Water resources management (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:208:y:2018:i:c:p:326-334

DOI: 10.1016/j.agwat.2018.06.028

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