O Método de Covariâncias Turbulentas Atenuadas (MCTA) para Medição dos Fluxos de Calor Sensível e Latente: Aplicação ao Lago de Itaipu e seu Redor

Dias, Nelson Luı́s; Kan, Akemi; Grodizki, Leocadio; Sanchez, Sandro; Júnior, D. Luchesi

doi:10.21168/rbrh.v7n1.p143-160

Cited by 6 publications

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“…The evaluation of these equations was initially made by Fernandes (2006). The current study aims to further contribute to the results already achieved by the previous study, and it is part of a project that intends to evaluate the performance of different equations of estimate of ETo, with the purpose to subsidize the use of these equations in the different Brazilian climatic conditions.…”

Section: Introductionmentioning

confidence: 98%

“…Oudin et al (2004), Fernandes (2006 and Barros (2012) reviewed commonly used equations in the literature. Such practical application is motivated due to the lack of data that avoid the use of more accurate equations.…”

Section: Introductionmentioning

confidence: 99%

“…Such practical application is motivated due to the lack of data that avoid the use of more accurate equations. Therefore, in this paper, to provide an adequate support for users that are exposed to different levels of data availability, the performance of six empirical equations for estimating evapotranspiration are investigated for the case study of Campos dos Goytacazes city located at Rio de Janeiro state, as initially developed in Fernandes (2006), using the recommended FAO56-Penman-Monteith equation (Allen et al, 1998) as a reference for comparison.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of six empirical evapotranspiration equations - case study: Campos dos Goytacazes/RJ

Fernandes

Paiva²,

Filho

2012

Rev. bras. meteorol.

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The evapotranspiration is a component of the water balance constituting a major challenge in its quantification. The complex physical processes involved in its effective determination on a large scale have spurred scientists to often make use of empirical equations, which have inherent limitations with regard to their applicability as descriptors of the evapotranspiration behavior in different regions across the world. This study was performed for the Campos dos Goytacazes region, in Rio de Janeiro state. It is proposed to investigate and to evaluate the performance of six empirical equations in contrast to FAO56-Penman-Monteith equation. The results indicated that the differences observed between the values obtained using the empirical models applied in this study and the values calculated by the FAO56-Penman-Monteith equation were greater than 10%, which means an error of about 0.5 mm.day -1 . Keywords: evapotranspiration, FAO56-Penman-Monteith, empirical equations. RESUMO: AVALIAÇÃO DE SEIS EQUAÇÕES EMPÍRICAS DE EVAPOTRANSPIRAÇÃO DIÁRIA -ESTUDO DE CASO: CAMPOS DOS GOYTACAZES/RJA evapotranspiração é um dos componentes do balanço hídrico que representa grande desafio em sua quantificação. Os processos físicos complexos envolvidos na sua determinação em larga escala têm estimulado cientistas a fazer o uso, muitas vezes, de equações empíricas, que apresentam intrínseca limitação no que concerne à aplicabilidade como descritores do comportamento da evapotranspiração em diferentes regiões do mundo. Este estudo foi realizado para a região de Campos dos Goytacazes, no estado do Rio de Janeiro, e propõe-se a investigar e avaliar o desempenho de seis equações empíricas em contraste com a equação FAO56-Penman-Monteith. Os resultados indicaram que as diferenças observadas entre os valores obtidos com os modelos empíricos aplicados neste estudo e os valores calculados pela equação de FAO56-Penman-Monteith foram maiores que 10%, o que significa um erro em torno de 0,5 mm.dia -1 . Palavras -chaves: evapotranspiração, FAO56-Penman-Monteith, equações empíricas.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of six empirical evapotranspiration equations - case study: Campos dos Goytacazes/RJ

Fernandes

Paiva²,

Filho

2012

Rev. bras. meteorol.

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“…O monitoramento micrometeorológico tem sido utilizado como uma importante ferramenta na análise dos dados ambientais, em especial a medição de fluxos superficiais através do método de covariâncias turbulentas ou eddy covariance (Dias et al, 2002;Aubinet et al, 2012;Scientifc, 1996;Lee et al, 2004 Após a aplicação de técnicas de correção e filtragem eliminando os dados fisicamente inconsistentes (outliers, Vissotto Jr. e Dias (2013)), os efeitos devido a sensibilidade dos sensores, pista de vento e advecção (Vissotto Jr et al, 2009;Cancelli et al, 2012) a série de dados fica com lacunas que precisam ser preenchidas.…”

Section: Método De Covariâncias Turbulentasunclassified

Estimativa De Fluxo De Calor Latente Em Reservatórios Através De Uma Rede Neural Artificial

Vissotto

Hoeltgebaum

Almeida

2016

CeN

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“…A previous version of the AEC method [ Dias et al , 2002] has been proposed with a vertical propeller anemometer and an empirical correction factor. In this work, the AEC is used with a low‐cost 3‐D sonic anemometer, and a rigorous theory for the correction factor is presented.…”

Section: Introductionmentioning

confidence: 99%

An attenuated eddy covariance method for latent heat flux measurements

Dias

Duarte

Maggiotto

et al. 2007

Water Resources Research

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[1] An attenuated eddy covariance (AEC) method is proposed, combining the use of a relatively robust three-dimensional sonic anemometer and a ventilated capacitive hygrometer-thermometer (CHT). The CHT is able to resolve a large enough frequency region of the water vapor density turbulent fluctuations to allow corrections for its limited time response in the inertial subrange of the vertical velocity-humidity cospectrum. This approach is often called the ''band-pass covariance method.'' In the present work we propose a technique in which the covariance between the vertical velocity and water vapor density fluctuations is calculated directly in the time domain (as in the standard eddy covariance technique) and then corrected for the effects of wind velocity and sensor temperature. This technique has been tested with the capacitive sensor ''uncapped'' and ''capped'' and in both cases compares well (RMSE 23 W m À2 ) with eddy covariance measurements using fast response hygrometers.

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O Método de Covariâncias Turbulentas Atenuadas (MCTA) para Medição dos Fluxos de Calor Sensível e Latente: Aplicação ao Lago de Itaipu e seu Redor

Cited by 6 publications

References 0 publications

Evaluation of six empirical evapotranspiration equations - case study: Campos dos Goytacazes/RJ

Evaluation of six empirical evapotranspiration equations - case study: Campos dos Goytacazes/RJ

Estimativa De Fluxo De Calor Latente Em Reservatórios Através De Uma Rede Neural Artificial

An attenuated eddy covariance method for latent heat flux measurements

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