Avaliação da evapotranspiração de referência na região de Seropédica- RJ, utilizando lisímetro de pesagem e modelos matemáticos

Abstract

Este trabalho foi realizado com o objetivo de avaliar a estimativa da evapotranspiração de referência (ETo) para a região de Seropédica, Rio de Janeiro, correlacionando medidas obtidas em lisímetros de pesagem com os métodos de Penman-Monteith-FAO 56 (PMF), Hargreaves-Samani (HS), Camargo (CA), Priestley-Taylor (PT), Makking (MA) e Tanque Classe A (TCA). Os valores de ETo estimados por PMF, PT e MA se mostraram bem correlacionados àqueles determinados pelo lisímetro de pesagem, ao passo que os métodos de HS e CA não apresentaram ajuste satisfatório aos dados do lisímetro. A ordem de grandeza dos erros de estimativa apresentados pelos métodos ajustados para a região de Seropédica é aceitável quando se pretende usar as estimativas para fins de dimensionamento de sistemas e para manejo da água de irrigação. Outra alternativa interessante é a utilização do Tanque Classe A, pela sua facilidade de manejo e pelo baixo custo, pois pode ser instalado próximo da lavoura.Palavras-chave: métodos de estimativa, Penman-Monteith-FAO, Hargreaves-Samani, manejo de irrigação Reference evapotranspiration in the region of Seropédica-RJ using weighting lysimeter and mathematical models AB S TR ACTThe present study aimed to evaluate the estimate of reference evapotranspiration (ETo) for the region of Seropédica, RJ, correlating measures obtained with weighing lysimeter and Penman-Monteith -FAO 56 (PMF), Hargreaves-Samani (HS), Camargo (CA), Priestley-Taylor (PT), Makking (MA) and Pan Class A (PCA) methods. The values of ETo estimated by PMF, PT and MA were well correlated to those determined by the weighing lysimeter, whereas the HS and CA methods showed unsatisfactory adjustment with the lysimeter data. The estimated mistakes from the adjusted methods for the region of Seropédica are acceptable for use in design and management irrigation systems. Another interesting alternative is the use of the Pan Class A method, due to the feasible handling and low cost, so that it can be installed near the field.

Performance of Estimative Models for Daily Reference Evapotranspiration in the City of Cassilândia, Brazil

“…The Makkink method was developed for climatic conditions in Wageningem, the Netherlands, and probably this was the reason for its performance. Other researchers also observed the same behavior in their research (BARROS et al, 2009;CAVALCANTE JR. et al, 2011;ARAÚJO et al, 2012;MAGALHÃES & CUNHA, 2012). The Linacre method is derived from Penman, estimating evapotranspiration through geographic data (latitude and altitude) and temperature, however, possibly denying of radiation and wind speed have turn it into unsatisfactory performance, corroborating PEREIRA et al (2009) andCUNHA (2012).…”

“…The Priestley-Taylor method was developed to estimate the evaporation of saturated surfaces in a non-saturated atmosphere, which is the nature's normal condition (BARROS et al, 2009;CAVALCANTE JR. et al, 2011) and its performance confirmed with what was observed by MOURA et al (2010); CUNHA (2012) andTAGLIAFERRE et al (2012b). The Camargo method is derived from the Thornthwaite method, and it works effectively in tropical climate and equatorial humid regions (CAVALCANTE JR. et al, 2011).…”

Estimation methods of reference evapotranspiration (ETo) for Uberlândia -MG

“…Similar results were found by OLIVEIRA et al (2008) when comparing daily values of ETo by method HG and by lysimeter of hydraulic weighting, achieved value r 2 = 0.71 in Vitória de Santo Antão -PE. Nevertheless, the adoption of coefficient of determination r 2 as the only criterion of quality definition of methods is not adequate, since this index do not establish the type and magnitude of differences between estimated value by standard method and value predicted by estimation methods (BARROS et al, 2009). Thereby, the analysis of coefficient of correlation and standard error of estimation are auxiliaries in result interpretation.…”

“…The results of conducted research varied extremely, since each region present peculiar climate characteristics and the estimation methods of ETo exhibits problems of precision and accuracy, mainly because of the non-adjustment of model coefficients and sensors accuracy (BARROS et al, 2009). These empirical methods are based on observations and statistical analysis, generally adequate for a climate condition or specific region (FOOLADMAND & AHMADI, 2009).…”

Métodos Empíricos Para Estimativa Da Evapotranspiração De Referência No Estado Do Rio De Janeiro

“…Alguns autores avaliaram o método PM comparando-o com lisímetros, e concluíram que esse é o método mais eficiente para estimar a ET0 (BARROS et al, 2009;SOUZA et al, 2011). Entretanto, este método necessita do conhecimento de vários elementos meteorológicos, que nem sempre se encontram disponíveis (MARTÍ et al, 2015).…”