Evaluation of models for estimating the reference evapotranspiration in colombian coffee zone Report as inadecuate




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Alexandra Mejía ; Elsa Viviana Marín ; Rafael Arango ;Agronomía Colombiana 2011, 29 1

Author: Víctor Hugo Ramírez

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Agronomía Colombiana ISSN: 0120-9965 agrocolfabog@gmail.com Universidad Nacional de Colombia Colombia Ramírez, Víctor Hugo; Mejía, Alexandra; Marín, Elsa Viviana; Arango, Rafael Evaluation of models for estimating the reference evapotranspiration in Colombian Coffee Zone Agronomía Colombiana, vol.
29, núm.
1, enero-abril, 2011, pp.
107-114 Universidad Nacional de Colombia Bogotá, Colombia Available in: http:--www.redalyc.org-articulo.oa?id=180322573014 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Evaluation of models for estimating the reference evapotranspiration in Colombian Coffee Zone Evaluación de modelos para calcular la evapotranspiración de referencia en la zona cafetera de Colombia Víctor Hugo Ramírez1,3, Alexandra Mejía2, Elsa Viviana Marín2, and Rafael Arango2 ABSTRACT RESUMEN The reference evapotranspiration (ETo) is an important variable for hydrological studies, crop water requirements estimations, climatic zonification and water resources management.
The FAO recommends the Penman-Monteith (P-M) and-or the Hargreaves models as the worldwide useful for the ETo calculation. The objective of this work was to test the performance of these models in one place of the Colombian Coffee Belt, and identify limitations and proposes modifications.
The ETo calculation were compared with daily lysimeter measurements.
The principal disadvantages of the P-M model were: the lack of calibrated coefficient for the long wave radiation estimation (R nl) which affected seriously the net radiation estimation and finally the ETo, highly sensitivity at the wind speed changes, that make it inappropriate for locations without this data.
The Hargreaves model, as FAO proposed, overestimate the ETo, which made necessary a mo...





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