The Bowen ratio-energy balance method for estimating latent heat flux of irrigated alfalfa evaluated in a semi-arid, advective environment

2000 ◽  
Vol 103 (4) ◽  
pp. 335-348 ◽  
Author(s):  
R Todd
Keyword(s):  
Heat Flux ◽  
Energy Balance ◽  
Latent Heat ◽  
Latent Heat Flux ◽  
Bowen Ratio ◽  
Balance Method ◽  
Energy Balance Method ◽  
Semi Arid ◽  
Ratio Energy

scholarly journals Micrometeorological methods to estimate sugarcane evapotranspiration in coastal northeastern region of Brazil

2019 ◽  
pp. 1422-1428
Author(s):  
Adolpho Emanuel Quintela da Rocha ◽  
José Leonaldo de Souza ◽  
Guilherme Bastos Lyra ◽  
Ricardo Araújo Ferreira Junior ◽  
Gustavo Bastos Lyra ◽  
...  
Keyword(s):  
Heat Flux ◽  
Energy Balance ◽  
Eddy Covariance ◽  
Latent Heat ◽  
Latent Heat Flux ◽  
Bowen Ratio ◽  
Water Vapour Pressure ◽  
Sensible Heat ◽  
Energy Balance Method ◽  
Ratio Energy

The aim of the present work was to evaluate the performance of Bowen ratio-energy balance method, as well as the energy balance closure by Eddy covariance technique for a sugarcane crop in Brazilian northeastern region. Micrometeorological measurements were carried out between June 7th and November 17th, 2013. Latent and sensible heat fluxes were determined through Eddy covariance technique (EC) and by the Bowen ratio-energy balance method (BREB), considering two approaches. The first, estimated the air temperature and water vapour pressure gradient in two levels above the canopy. The second method measured the air temperature and water vapour pressure at the first level and the surface temperature from radiometric measurements. Latent heat flux was also estimated as energy balance residue from determinations of the sensible heat flux by Eddy covariance. The degree of energy balance closure was dependent on the time of the day considered. Bowen ratio - energy balance estimated from the first approach, showed the best agreement with the eddy covariance measurements to estimate latent heat flux, while in the second case, when the Bowen ratio was estimated using the surface temperature, the linear relationship was the most discrepant. Therefore, the Bowen ratio conventional method is more suitable for estimating latent heat flux in sugarcane.

scholarly journals DIURNAL ENERGY BALANCE STUDIES OVER WHEAT USING BOWEN RATIO ENERGY BALANCE METHOD

MAUSAM ◽  
2022 ◽  
Vol 45 (4) ◽  
pp. 333-336
Author(s):  
A.S. Mokate ◽  
M. C. VARSHNEYA ◽  
T. R .V. NAIDU
Keyword(s):  
Energy Balance ◽  
Latent Heat ◽  
Bowen Ratio ◽  
Balance Method ◽  
Energy Balance Method ◽  
Heat Partitioning ◽  
Ratio Energy

Enelll:Y bala nce study was cond ucted uver ....n eat crop at its vari ou s Ilru"'1h stases unde r irriga tedcondition .. usine Bo~'e11 Rat io Enere)' Balance (HRt:lH 1U~1huJ . On clea r days net radi auo i. (R.> ranee.! from S17 10()l)4 w mc TIH" mi d-day latent heat partitioning was appnlJ.imalely H9. lUI. 92 and 1m", o f R. at joinung, flowe ring.soli doujh find ha rd d uugh stage s re spectlve ry. The soil heat n ux (5) was approximatel y 6 to 13%of R" a nd wasminimum .11 "nfl ,toul!'h ..tage. Th e se ns ible heat udvecu ou ""liS found In be a common ph enomenon a nd comrtbutedapp U),'(iOl;\td)' 1 to S"'" o f R. a t mid -liar a nd ihi Inten ..il)' wa s 1Il 0~ afte r 1401.) hOI at all stases  

Estimation of seasonal crop water consumption in a vineyard using Bowen ratio-energy balance method

2007 ◽  
Vol 21 (26) ◽  
pp. 3635-3641 ◽  
Author(s):  
B. Z. Zhang ◽  
S. Z. Kang ◽  
L. Zhang ◽  
T. S. Du ◽  
S. E Li ◽  
...  
Keyword(s):  
Energy Balance ◽  
Water Consumption ◽  
Bowen Ratio ◽  
Balance Method ◽  
Crop Water ◽  
Energy Balance Method ◽  
Crop Water Consumption ◽  
Ratio Energy

The role of decoupling factor on sugarcane crop water use under tropical conditions

2019 ◽  
Vol 55 (6) ◽  
pp. 913-923 ◽  
Author(s):  
Daniel Silveira Pinto Nassif ◽  
Leandro Garcia da Costa ◽  
Murilo dos Santos Vianna ◽  
Kassio dos Santos Carvalho ◽  
Fabio Ricardo Marin
Keyword(s):  
Energy Balance ◽  
Irrigation Management ◽  
Bowen Ratio ◽  
Balance Method ◽  
Crop Water ◽  
Flow Measurements ◽  
Energy Balance Method ◽  
Sugarcane Crop ◽  
Tropical Conditions ◽  
Ratio Energy

AbstractThe expansion of sugarcane crop to regions with lower water supply in Brazil has increased the importance of correct estimation of crop water requirements. Currently, the irrigation management is generally done using the crop coefficient (Kc) based on the FAO 56 bulletin. Kc is used to determine the potential water demand of the crop for a given period of time and is considered constant for each crop stage. However, some recent studies have shown that Kc can be significantly variable under different evapotranspiration (ETo) rates. This paper aimed to analyse sugarcane water consumption at different scales: plant (sap flow measurements by energy balance method); canopy (Bowen ratio energy balance method); and plant–atmosphere coupling (infrared gas analyser) to reduce the uncertainties on the irrigation practices. Measurements were taken at two experimental sites, where a modern Brazilian cultivar CTC 12 was grown under drip irrigation and an old main Brazilian cultivar (RB867515) was grown under sprinkler irrigation by a central pivot. The mean crop evapotranspiration (ETc) values by the Bowen ratio energy balance method were 2.92 and 3.68 mm d−1 for RB867515 and CTC 12, respectively, resulting in a mean Kc of 0.99 at the full vegetative growth stage. Kc values were dependent on ETo and varied between 0.2 and 1.7 for both cultivars. This occurred in a crop coupled to the atmosphere (Ω = 0.37) and was the same found in other coupled crops such as coffee and citrus. In conclusion, the sugarcane Kc for southeast Brazil presented temporal variability due to coupling conditions according to reference evapotranspiration, and this should be considered in irrigation management.

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