Comparação entre métodos de estimativa da evapotranspiração de referência (ETo) em regiões citrícolas paulistas

Palaretti, Luiz Fabiano; Mantovani, Everardo Chartuni; Sediyama, Gilberto Chohaku

doi:10.1590/s0100-69162014000100005

Cited by 10 publications

(7 citation statements)

References 5 publications

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“…This method is based on physical aspects of the evaporation and transpiration processes with respect to hypothetical grass reference (ALLEN et al, 1998), and it has been used worldwide (CUNHA et al, 2013). However, an important disadvantage of this method is the relative large number of input meteorological variables (DROOGERS; ALLEN, 2002;BORGES JÚNIOR et al, 2012), and then its use may become unreliable due to non-availability and low quality information at certain localities (PALARETTI et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In order to find alternatives when facing this situation, many researchers have been proposed estimating ET0 with methods that demand less input data (ALENCAR et al, 2011;FANAYA JUNIOR et al, 2012;CHAGAS et al, 2013;PALARETTI et al, 2014;CARVALHO et al, 2015). Among those methods, Hargreaves-Samani (HARGREAVES;SAMANI, 1985), with only minimum and maximum temperature data, is considered the simplest one to estimate the reference evapotranspiration (ALENCAR et al, 2015) and it can be used for irrigation management (NÓIA et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Reference evapotranspiration estimates by means of Hargreaves-samani and Penman-monteith fao methods with missing data in the northwestern Mato Grosso do Sul

Cunha¹,

Venâncio²,

Campos³

et al. 2017

Biosci. J.

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ABSTRACT:We aimed to assess the performance of different methodologies to estimate the reference evapotranspiration (ET0) in different seasons for at 1, 3, 6 and 10 days for the Northwestern Mato Grosso do Sul. We used a set of daily data obtained from the networks of the Brazilian National Institute of Meteorology for Água Clara, Cassilândia, Chapadão do Sul, Paranaíba and Três Lagoas locations. The meteorological data used were: maximum and minimum air temperatures, wind speed, solar radiation, and relative humidity. The methodologies used for the ET0 estimation were Hargreaves-Samani and Penman-Monteith (PM-FAO) using all the meteorological data needed and missing data on relative humidity, solar radiation and wind speed. To compare ET0 values estimated by means of equations tested against the PM-FAO method we analyzed the parameters of linear regression equation "β 0 " and "β 1 ", coefficient of determination (r²), standard-error of estimate (SEE) and coefficient of performance (c). The PM-FAO method with missing data (relative humidity and wind speed) were the best alternatives to estimate ET0, followed by the PM-FAO method with missing solar radiation data in all timescales during fall and winter seasons. The HargreavesSamani method is not recommended to be used in its original form to estimate ET0 in the Northwestern Mato Grosso do Sul, in none of the timescales and seasons.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reference evapotranspiration estimates by means of Hargreaves-samani and Penman-monteith fao methods with missing data in the northwestern Mato Grosso do Sul

Cunha¹,

Venâncio²,

Campos³

et al. 2017

Biosci. J.

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“…Os coeficientes de correlação gerais obtidos foram iguais a 0,84, para o método sem calibração, 0,85 com a calibração anual, e 0,86 para as demais calibrações. Palaretti et al (2014) Comparativamente às médias obtidas com o método FAO Penman-Monteith (Tabela 1), observa-se que os desvios percentuais variaram de 14,8% a 28,8% para o método original. Para as médias mensais, a calibração possibilitou forte redução nos erros percentuais, que variaram de -5,3 a 2,9%, -5,9 a 4,3%, -3,0 a 3,2% e -0,8 a 1,1%, respectivamente, para calibração anual, semestral, trimestral e mensal.…”

Section: Resultsunclassified

“…Hargreaves-Samani original (Orig.) e calibrado em diferentes bases temporais clima úmido ou subúmido, tem sido verificada por diferentes autores (MELO & FERNANDES, 2012;BOGAWSKI & BEDNORZ, 2014;PALARETTI et al, 2014;ALENCAR et al, 2015). Como resultados do teste Mann-Whitney, ao nível de significância de 5%, aplicado para comparação entre as distribuições de probabilidade da evapotranspiração de referência diária, verificase a rejeição da hipótese de nulidade, isto é, de ajuste entre as distribuições referentes aos métodos FAO Penman-Monteith e Hargreaves-Samani calibrado em base anual.…”

Section: Resultsunclassified

Equação De Hargreaves-Samani Calibrada Em Diferentes Bases Temporais Para Sete Lagoas, Mg

Júnior¹,

Oliveira²,

Andrade³

et al. 2017

Reveng

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Dados de evapotranspiração de referência (ETo) são requeridos em diversas análises relacionadas ao uso de recursos hídricos, como no manejo de irrigação, balanço hídrico de sequeiro, manejo de bacias hidrográficas, etc. O método FAO Penman-Monteith (FAO-PM) é considerado padrão para cálculo da ETo. Contudo, a aplicação deste método pode ser restringida pela falta de dados meteorológicos. Um dos métodos alternativos com menor requisição de dados é o Hargreaves-Samani (HS), o qual comumente necessita calibração local para obtenção de maior exatidão na aplicação. O objetivo deste trabalho foi avaliar o desempenho do método Hargreaves-Samani, na sua forma original e calibrado em base anual, semestral, trimestral e mensal, frente ao método padrão FAO-PM, com base em extensa série histórica de dados meteorológicos diários (86 anos), para a localidade de Sete Lagoas, MG. Calibraram-se os coeficientes e o expoente da equação de HS pela minimização do erro absoluto médio (EAM). Para avaliar a adequabilidade de aplicação de testes comparativos e para determinar o ajuste das distribuições de probabilidade de ETo, foram aplicados os testes de Kolmogorov-Smirnov e Mann-Whitney, respectivamente. A calibração do método HS anulou a tendência de superestimativa sistemática dos valores de ETo diária, comparativamente ao FAO-PM, reduzindo-se o EAM. A calibração em diferentes bases temporais acarretou a aproximação das distribuições de probabilidade de ETo calculada por meio do método HS, que não diferiram significativamente entre si, à obtida com o método FAO-PM.

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“…The Penman Monteith method recommended by the FAO (Food and Agriculture Organization of the United Nations) to estimate the reference evapotranspiration demand different weather variables (Ortega-Farias et al, 2009) causing difficulties in their use (Conceição, 2010;Alencar et al, 2011;Palaretti et al, 2014), whereas few countries hold enough weather stations throughout its area and with equipment able to provide all the information necessary for implementing this method (Tabari, 2010).…”

Section: Introductionmentioning

confidence: 99%

Analysis of reference evapotranspiration of Janaúba, mg

Reis

Oliveira

Lopes³

2016

Idesia

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Knowledge of the reference evapotranspiration (ETo) is essential for the irrigation management of agricultural crops worldwide. The Penman Monteith demand different weather variables, which hinders its application in areas with few weather stations such as the north of Minas Gerais. This work, compare the method of Hargreaves Samani with Penman Monteith and determine the frequency of occurrence of the reference evapotranspiration in the city of Janaúba, MG. To assess the fit of Hargreaves Samani equation with Penman Monteith used the coefficient of determination (r 2 ), the coefficient of correlation (r), the standard error of estimate (SEE), the index agreement (d) and the index performance (c). Kimball's method was used for determining the frequency of occurrence. The results indicate that the Hargreaves Samani method overestimates the values of Penman Monteith at 8%, but in the monthly analysis, it is observed that between the months April to August Penman values were superior to Hargreaves. All statistical criteria used showed Hargreaves Samani fitted equation with a better assessment when compared with the Penman Monteith. The higher frequency of occurrence was between 4.5 and 4.7 mm day -1 (6.62%) and the equation that indicates the probability of being equaled or exceeded evaporation showed an r 2 equal to 0.9676.Key words: Penman Monteith, Hargreaves Samani, frequency of occurrence, water, agrometeorology. RESUMEN El conocimiento acerca de la evapotranspiración de referencia (ETo) es esencial para el manejo del riego en los cultivos agríco-las en todo el mundo. El método de Penman Monteith utiliza diversas variables meteorológicas, dificultando su utilización en regiones con pocas estaciones meteorológicas, como es el caso del norte de Minas Gerais. El objetivo de este trabajo fue realizar una comparación entre los métodos de Hargreaves Samani y Penman

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Comparação entre métodos de estimativa da evapotranspiração de referência (ETo) em regiões citrícolas paulistas

Cited by 10 publications

References 5 publications

Reference evapotranspiration estimates by means of Hargreaves-samani and Penman-monteith fao methods with missing data in the northwestern Mato Grosso do Sul

Reference evapotranspiration estimates by means of Hargreaves-samani and Penman-monteith fao methods with missing data in the northwestern Mato Grosso do Sul

Equação De Hargreaves-Samani Calibrada Em Diferentes Bases Temporais Para Sete Lagoas, Mg

Analysis of reference evapotranspiration of Janaúba, mg

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