Comparación de ecuaciones empíricas para el cálculo de la evapotranspiración de referencia en la Región del Libertador General Bernardo O'Higgins, Chile

Abstract

Evapotranspiration is an important parameter for different scientific fields and its measurement is necessary for the proper management of hydric resources, the construction of irrigation infrastructure and the characterization of different climatic environments. Due the complexity of this process different methods have been developed in order to achieve its estimation, some of them more precise than others compared with direct measures in field. In this paper, the results obtained from six well known methods for estimating reference evapotranspiration (ETo) with different requirements of input data are compared. Data was obtained from meteorological stations in the study area for the period 1998-2006. The results show, in general, a good fit between the selected models, although the Ivanov model was not as precise as the other five ones, all of them in stations with oceanic and inner influence.