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Estimation of the potential evapotranspiration by a simplified penman method REA
Villa Nova,Nilson A.; Miranda,Jarbas H. de; Pereira,André B.; Silva,Késia O. da.
The numerous methods for calculating the potential or reference evapotranspiration (ETo or ETP) almost always do for a 24-hour period, including values of climatic parameters throughout the nocturnal period (daily averages). These results have a nil effect on transpiration, constituting the main evaporative demand process in cases of localized irrigation. The aim of the current manuscript was to come up with a model rather simplified for the calculation of diurnal daily ETo. It deals with an alternative approach based on the theoretical background of the Penman method without having to consider values of aerodynamic conductance of latent and sensible heat fluxes, as well as data of wind speed and relative humidity of the air. The comparison between the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop water use; Bowen ratio; Energy balance.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162006000300007
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Performance of the SSEBop model in the estimation of the actual evapotranspiration of soybean and bean crops. Repositório Alice
PAULA, A. C. P. de; SILVA, C. L. da; RODRIGUES, L. N.; SCHERER-WARREN, M..
The objective of this work was to evaluate the performance of the operational simplified surface energy balance (SSEBop) model in the estimation of the actual evapotranspiration (ETa) of soybean and bean crops irrigated by a central pivot. The model estimates were obtained from digital images of the Landsat 7 and Landsat 8 satellites, and were compared with the ETa obtained by the Bowen ratio method. The model was evaluated by the refined agreement index (dr), root mean square error (RMSE), and mean bias error (MBE). The model?s performance in the estimation of the ETa was classified by the performance index (Pi). The relationship between the estimates of the model and the Bowen ratio method showed correlation (r=0.94) and agreement (dr=0.82), with a mean...
Tipo: Artigo de periódico Palavras-chave: Water resources management; Bowen ratio; Razão de Bowen; Gerenciamento dos recurso hídrico; Glycine Max; Phaseolus Vulgaris; Sensoriamento Remoto; Recurso Hídrico; Remote sensing.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1111868
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Performance of the SSEBop model in the estimation of the actual evapotranspiration of soybean and bean crops PAB
Paula,Adriano Cesar Pereira de; Silva,Cícero Lopes da; Rodrigues,Lineu Neiva; Scherer-Warren,Morris.
Abstract: The objective of this work was to evaluate the performance of the operational simplified surface energy balance (SSEBop) model in the estimation of the actual evapotranspiration (ETa) of soybean and bean crops irrigated by a central pivot. The model estimates were obtained from digital images of the Landsat 7 and Landsat 8 satellites, and were compared with the ETa obtained by the Bowen ratio method. The model was evaluated by the refined agreement index (dr), root mean square error (RMSE), and mean bias error (MBE). The model’s performance in the estimation of the ETa was classified by the performance index (Pi). The relationship between the estimates of the model and the Bowen ratio method showed correlation (r=0.94) and agreement (dr=0.82),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Phaseolus vulgaris; Bowen ratio; Remote sensing; Water resources management.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000100901
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Validation study of an overall radiation balance estimation method under Ponta Grossa (PR) Brazil weather conditions REA
Beruski,Gustavo C.; Pereira,André B..
Radiation balance is the fraction of incident solar radiation upon earth surface which is available to be used in several natural processes, such as biological metabolism, water loss by vegetated surfaces, variation of temperature in farming systems and organic decomposition. The present study aimed to assess and validate the performance of two estimation models for Rn in Ponta Grossa city, Paraná State, Brazil. To this end, during the period of 04/01/2008 to 04/30/2011, from radiometric data collected by an automatic weather station set at the Experimental Station, of the State University of Ponta Grossa. We performed a linear regression study by confrontation between measurements made through radiometric balance and Rn estimates obtained from Brunt...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Overall radiation balance; Bowen ratio; Global solar radiation; Modeling; Solar radiometry.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300010
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WATER REQUIREMENT ESTIMATE FOR THE REPRODUCTIVE PERIOD OF MANGO ORCHADS IN THE NORTHEAST OF THE STATE OF PARÁ, BRAZIL Rev. Bras. Frutic.
SOUZA,PAULO JORGE DE OLIVEIRA PONTE DE; RODRIGUES,JULIANA CHAGAS; SOUSA,ADRIANO MARLISOM LEÃO DE; LIMA,RENATA TRINDADE DE; ROCHA,EDSON JOSÉ PAULINO DA; ORTEGA-FARIAS,SAMUEL.
ABSTRACT The aim of this study was to estimate the water consumption in mango orchard during its phenological stages in the northeastern of the State of Pará, Brazil. For this purpose, it was installed and instrumented a micrometeorological tower in a mango orchard, cv. Tommy Atkins, of 22 years old, with data collected during the crops of 2010/2011 and of 2011/2012. The actual crop evapotranspiration was estimated from the energy balance using the Bowen ratio technique. The crops were subjected to different weather conditions, consequently, some differences in the Bowen ration values were observed. The evapotranspiration suffered influences of meteorological conditions during the period. The actual crop evapotranspiration during its reproductive period...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mangifera indica L; Tommy Atkins; Evapotranspiration; Bowen ratio.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000300705
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