Evaluation of empirical methods to estimate reference evapotranspiration in Uberaba, State of Minas Gerais, Brazil

Author:

Melo Giovani L. de,Fernandes André L. T.1

Affiliation:

1. Universidade de Uberaba

Abstract

Evapotranspiration is the process of water loss of vegetated soil due to evaporation and transpiration, and it may be estimated by various empirical methods. This study had the objective to carry out the evaluation of the performance of the following methods: Blaney-Criddle, Jensen-Haise, Linacre, Solar Radiation, Hargreaves-Samani, Makkink, Thornthwaite, Camargo, Priestley-Taylor and Original Penman in the estimation of the potential evapotranspiration when compared to the Penman-Monteith standard method (FAO56) to the climatic conditions of Uberaba, state of Minas Gerais, Brazil. A set of 21 years monthly data (1990 to 2010) was used, working with the climatic elements: temperature, relative humidity, wind speed and insolation. The empirical methods to estimate reference evapotranspiration were compared with the standard method using linear regression, simple statistical analysis, Willmott agreement index (d) and performance index (c). The methods Makkink and Camargo showed the best performance, with "c" values of 0.75 and 0.66, respectively. The Hargreaves-Samani method presented a better linear relation with the standard method, with a correlation coefficient (r) of 0.88.

Publisher

FapUNIFESP (SciELO)

Subject

Agricultural and Biological Sciences (miscellaneous)

Reference39 articles.

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2. Comparação de diferentes métodos de estimativa diária da evapotranspiração de referência para a região de Uberaba;ALENCAR L. P.;Revista Brasileira de Ciências Agrárias,2011

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4. Estimativa da evapotranspiração de referência através de redes neurais artificiais;ALVES SOBRINHO T.;Revista Brasileira de Meteorologia,2011

5. Estimativa da evapotranspiração a partir de variação de nível estático de aquífero;BARRETO C. E. A. G.;Engenharia Agrícola,2009

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