Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina
In view of the water scarcity that affects the province of Mendoza, Argentina, information on reference crop evapotranspiration (ET0) is crucial for irrigation scheduling. Data that are not generally available is required for the determination of ET0, with the Penman-Monteith FAO56 equation (PM). T...
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Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo
2018-12-01
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doaj-9b2194705976487292c4f4ec81935ac82021-04-16T18:41:39ZengFacultad de Ciencias Agrarias. Universidad Nacional de CuyoRevista de la Facultad de Ciencias Agrarias0370-46611853-86652018-12-01502Parameterization of the Hargreaves equation in the northern oasis of Mendoza, ArgentinaRegina Aguilera0José Francisco Maestre-Valero1Victoriano MartÃnez-Alvarez2MarÃa Gassmann3 José Morábito4Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Alte. Brown 500. Chacras de Coria. Mendoza. Argentina. M5528AHB. Universidad Politécnica de Cartagena. Escuela Superior de IngenierÃa Agronómica. Murcia. EspañaUniversidad Politécnica de Cartagena. Escuela Superior de IngenierÃa Agronómica. Murcia. EspañaUniversidad Nacional de Buenos Aires. Departamento de Ciencias de la Atmósfera y de los Océanos. Ciudad Autónoma de Buenos Aires. ArgentinaUniversidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Alte. Brown 500. Chacras de Coria. Mendoza. Argentina. M5528AHB In view of the water scarcity that affects the province of Mendoza, Argentina, information on reference crop evapotranspiration (ET0) is crucial for irrigation scheduling. Data that are not generally available is required for the determination of ET0, with the Penman-Monteith FAO56 equation (PM). The Hargreaves equation (HG), which only requires air temperature data, represents an alternative to calculate ET0, after its local or regional calibration with PM. In this paper, the Hargreaves equation was calibrated locally by means of annual (Ca) and monthly (Cm,j) adjustment coefficients for the northern oasis of Mendoza. Also, a regionalisation of the Ca was performed considering environmental variables. The local adjustment with both coefficients made it possible to correct the positive bias that indicated an overestimation of HG with respect to PM in 12 meteorological stations. The mean value of the root mean square error decreased from 0.80 mm day-1 to 0.57 mm day-1 with the Ca adjustment coefficient, and to 0.55 mm day-1 with the Cm,j adjustment coefficient, while the absolute error decreased from 0.63 to 0.42 and 0.39, respectively. Wind speed was the variable that best explained the regional variability of the Ca (R2 = 0.64). http://172.22.185.100/ojs3/index.php/RFCA/article/view/2957reference evapotranspirationirrigation programmingHargreaves equationwater scarcityadjustment coefficient |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Regina Aguilera José Francisco Maestre-Valero Victoriano MartÃnez-Alvarez MarÃa Gassmann José Morábito |
spellingShingle |
Regina Aguilera José Francisco Maestre-Valero Victoriano MartÃnez-Alvarez MarÃa Gassmann José Morábito Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina Revista de la Facultad de Ciencias Agrarias reference evapotranspiration irrigation programming Hargreaves equation water scarcity adjustment coefficient |
author_facet |
Regina Aguilera José Francisco Maestre-Valero Victoriano MartÃnez-Alvarez MarÃa Gassmann José Morábito |
author_sort |
Regina Aguilera |
title |
Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina |
title_short |
Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina |
title_full |
Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina |
title_fullStr |
Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina |
title_full_unstemmed |
Parameterization of the Hargreaves equation in the northern oasis of Mendoza, Argentina |
title_sort |
parameterization of the hargreaves equation in the northern oasis of mendoza, argentina |
publisher |
Facultad de Ciencias Agrarias. Universidad Nacional de Cuyo |
series |
Revista de la Facultad de Ciencias Agrarias |
issn |
0370-4661 1853-8665 |
publishDate |
2018-12-01 |
description |
In view of the water scarcity that affects the province of Mendoza, Argentina, information on reference crop evapotranspiration (ET0) is crucial for irrigation scheduling. Data that are not generally available is required for the determination of ET0, with the Penman-Monteith FAO56 equation (PM). The Hargreaves equation (HG), which only requires air temperature data, represents an alternative to calculate ET0, after its local or regional calibration with PM. In this paper, the Hargreaves equation was calibrated locally by means of annual (Ca) and monthly (Cm,j) adjustment coefficients for the northern oasis of Mendoza. Also, a regionalisation of the Ca was performed considering environmental variables. The local adjustment with both coefficients made it possible to correct the positive bias that indicated an overestimation of HG with respect to PM in 12 meteorological stations. The mean value of the root mean square error decreased from 0.80 mm day-1 to 0.57 mm day-1 with the Ca adjustment coefficient, and to 0.55 mm day-1 with the Cm,j adjustment coefficient, while the absolute error decreased from 0.63 to 0.42 and 0.39, respectively. Wind speed was the variable that best explained the regional variability of the Ca (R2 = 0.64).
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topic |
reference evapotranspiration irrigation programming Hargreaves equation water scarcity adjustment coefficient |
url |
http://172.22.185.100/ojs3/index.php/RFCA/article/view/2957 |
work_keys_str_mv |
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