Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard

The use of actual evapotranspiration (ETα) models requires an appropriate parameterization of the available energy, where the net radiation (Rn) is the most important component. Thus, a study was carried out to calibrate and evaluate three semi-empirical approaches to estimate net radiation...

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Autores principales:	López-Olivari,Rafael, Ortega-Farías,Samuel, Morales,Luis, Valdés,Héctor
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2015
Materias:	Actual evapotranspiration air emissivity Brutsaert’s equation training system Olea europaea
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400011
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spelling	oai:scielo:S0718-583920150004000112018-10-01Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchardLópez-Olivari,RafaelOrtega-Farías,SamuelMorales,LuisValdés,Héctor Actual evapotranspiration air emissivity Brutsaert’s equation training system Olea europaea The use of actual evapotranspiration (ETα) models requires an appropriate parameterization of the available energy, where the net radiation (Rn) is the most important component. Thus, a study was carried out to calibrate and evaluate three semi-empirical approaches to estimate net radiation (Rn) over a drip-irrigated olive (Olea europaea L. ’Arbequina’) orchard during 2009/2010 and 2010/2011 seasons. The orchard was planted in 2005 at high density in the Pencahue Valley, Maule Region, Chile. The evaluated models were calculated using the balance between long and short wave radiation. To achieve this objective it was assumed that Ts = Tα for Model 1, Ts = Tv for Model 2 and Ts = Tr for Model 3 (Ts is surface temperature; Tα is air temperature; and Tv is temperature inside of the tree canopy; Tr is radiometric temperature). For the three models, the Brutsaert’s empirical coefficient (Φ) was calibrated using incoming long wave radiation equation with the database of 2009/2010 season. Thus, the calibration indicated that Φ was equal to 1.75. Using the database from 2010/2011 season, the validation indicated that the three models were able to predict the Rn at a 30-min interval with errors lower than 6%, root mean square error (RMSE) between 26 and 39 W m-2 and mean absolute error (MAE) between 20 and 31 W m-2. On daily time intervals, validation indicated that models presented errors, RMSE and MAE between 2% and 3%, 1.22-1.54 and 1.04-1.35 MJ m-2 d-1, respectively. The three R-Models would be evaluated and used in others Mediterranean conditions according to the availability of data to estimate net radiation over a drip-irrigated olive orchard planted at high density.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.75 n.3 20152015-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400011en10.4067/S0718-58392015000400011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Actual evapotranspiration air emissivity Brutsaert’s equation training system Olea europaea
spellingShingle	Actual evapotranspiration air emissivity Brutsaert’s equation training system Olea europaea López-Olivari,Rafael Ortega-Farías,Samuel Morales,Luis Valdés,Héctor Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
description	The use of actual evapotranspiration (ETα) models requires an appropriate parameterization of the available energy, where the net radiation (Rn) is the most important component. Thus, a study was carried out to calibrate and evaluate three semi-empirical approaches to estimate net radiation (Rn) over a drip-irrigated olive (Olea europaea L. ’Arbequina’) orchard during 2009/2010 and 2010/2011 seasons. The orchard was planted in 2005 at high density in the Pencahue Valley, Maule Region, Chile. The evaluated models were calculated using the balance between long and short wave radiation. To achieve this objective it was assumed that Ts = Tα for Model 1, Ts = Tv for Model 2 and Ts = Tr for Model 3 (Ts is surface temperature; Tα is air temperature; and Tv is temperature inside of the tree canopy; Tr is radiometric temperature). For the three models, the Brutsaert’s empirical coefficient (Φ) was calibrated using incoming long wave radiation equation with the database of 2009/2010 season. Thus, the calibration indicated that Φ was equal to 1.75. Using the database from 2010/2011 season, the validation indicated that the three models were able to predict the Rn at a 30-min interval with errors lower than 6%, root mean square error (RMSE) between 26 and 39 W m-2 and mean absolute error (MAE) between 20 and 31 W m-2. On daily time intervals, validation indicated that models presented errors, RMSE and MAE between 2% and 3%, 1.22-1.54 and 1.04-1.35 MJ m-2 d-1, respectively. The three R-Models would be evaluated and used in others Mediterranean conditions according to the availability of data to estimate net radiation over a drip-irrigated olive orchard planted at high density.
author	López-Olivari,Rafael Ortega-Farías,Samuel Morales,Luis Valdés,Héctor
author_facet	López-Olivari,Rafael Ortega-Farías,Samuel Morales,Luis Valdés,Héctor
author_sort	López-Olivari,Rafael
title	Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
title_short	Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
title_full	Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
title_fullStr	Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
title_full_unstemmed	Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
title_sort	evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000400011
work_keys_str_mv	AT lopezolivarirafael evaluationofthreesemiempiricalapproachestoestimatethenetradiationoveradripirrigatedoliveorchard AT ortegafariassamuel evaluationofthreesemiempiricalapproachestoestimatethenetradiationoveradripirrigatedoliveorchard AT moralesluis evaluationofthreesemiempiricalapproachestoestimatethenetradiationoveradripirrigatedoliveorchard AT valdeshector evaluationofthreesemiempiricalapproachestoestimatethenetradiationoveradripirrigatedoliveorchard
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Evaluation of three semi-empirical approaches to estimate the net radiation over a drip-irrigated olive orchard

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