New empirical formula for hourly estimations of reference evapotranspiration

dc.contributor.author	Alexandris, S	en
dc.contributor.author	Kerkides, P	en
dc.date.accessioned	2014-06-06T06:45:34Z
dc.date.available	2014-06-06T06:45:34Z
dc.date.issued	2003	en
dc.identifier.issn	03783774	en
dc.identifier.uri	http://dx.doi.org/10.1016/S0378-3774(02)00172-5	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/2512
dc.subject	Empirical method	en
dc.subject	Hourly reference evapotranspiration	en
dc.subject	Meteorological factors	en
dc.subject	Penman-Monteith	en
dc.subject	Trend surface analysis	en
dc.subject.other	Atmospheric humidity	en
dc.subject.other	Data reduction	en
dc.subject.other	Evaporation	en
dc.subject.other	Mathematical models	en
dc.subject.other	Meteorology	en
dc.subject.other	Polynomials	en
dc.subject.other	Regression analysis	en
dc.subject.other	Solar radiation	en
dc.subject.other	Evapotranspiration	en
dc.subject.other	Transpiration	en
dc.subject.other	empirical analysis	en
dc.subject.other	estimation method	en
dc.subject.other	evapotranspiration	en
dc.subject.other	modeling	en
dc.subject.other	Penman-Monteith equation	en
dc.title	New empirical formula for hourly estimations of reference evapotranspiration	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0378-3774(02)00172-5	en
heal.publicationDate	2003	en
heal.abstract	A new empirical equation for estimating hourly reference evapotranspiration ET0 is proposed. This equation requires data for three pertinent meteorological attributes, solar radiation Rs, air temperature T, and relative humidity RH. A routine surface polynomial regression analysis in three stages, is employed in order to estimate the factors ci entering the empirical model ET0 = f(Rs, RH, T; ci). For the calibration of the proposed model, data sets collected from Copais (Greece) were used. Verification of the validity of the model was obtained using independent data from Copais as well as data from CIMIS (Davis, Sacramento, CA). A comparative evaluation of the model was performed against some of the most widely used and strongly recommended models for estimating hourly ET0. Among them are the recently proposed Penman-Monteith (FAO56-Penman-Monteith), CIMIS version of Penman (CIMIS-Penman), and the American Society of Civil Engineers version of Penman-Monteith (ASCE-PM). Statistics and scatterplots, using ASCE-PM as the standard model indicate that the new empirical equation (Copais) operates quite satisfactorily for both regions, therefore may provide the premises to become a tool, for routine hourly reference evapotranspiration calculations. © 2002 Elsevier Science B.V. All rights reserved.	en
heal.journalName	Agricultural Water Management	en
dc.identifier.issue	3	en
dc.identifier.volume	60	en
dc.identifier.doi	10.1016/S0378-3774(02)00172-5	en
dc.identifier.spage	157	en
dc.identifier.epage	180	en