Desempenho Do Método Do Balanço De Energia - Razão De Bowen Na Estimativa Da Evapotranspiração De Referência

Silva, Leonardo Duarte Batista da; Lyra, Guilherme Bastos; Silva, Jonathas Batista Gonçalves; Pinho, Camila Ferreira de; Nascentes, Alexandre Lioi; Almeida, Gilda Vieira de; Folegatti, Marcos Vinícius

doi:10.15809/irriga.2016v21n3p516-529

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…One disadvantage of BREB is the requirement for continuous readings of air temperature and humidity gradients, radiation budget and heat flow in the soil, which are essential to determine evapotranspiration (Silva et al 2016). In addition, readings are limited by sunrise and sunset, because there is low variability in air temperature and humidity gradients (Souza et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Estimation of evapotranspiration and single and dual crop coefficients of acai palm in the Eastern Amazon (Brazil) using the Bowen ratio system

Sousa

Fernandes²,

Tavares

et al. 2021

Irrig Sci

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The acai palm (Euterpe oleracea Mart.) is a fruit from the Amazon that is originally found in flooded areas. Over recent years, its marketability has gained significant interest in Brazil and abroad because of its agronomic, nutritional and economic potential. However, there is a lack of technical-scientific information about crop water requirements for irrigation management during the reproductive phase of acai palm. Therefore, the aim of this research was to estimate the water requirements (crop evapotranspiration (ET c ), single (Kc) and dual (Kcb + Ke) crop coefficients) of acai palm in the Eastern Amazon (Brazil) using the Bowen ratio system. A micrometeorological tower was installed in the center of an experimental area to monitor ET c and meteorological variables. Phenological development was monitored during two growing seasons. Soil water evaporation was determined on a daily scale using weighing microlysimeters. Ke and Kcb values were calculated by the ratio of soil surface evaporation and transpiration to reference evapotranspiration (ET o ), respectively. Total water requirements of the acai palms were 1165 mm, with a daily average of 3.49 mm day −1 for the growing season. The average values of Kc, Ke and Kcb for the acai palm were 1.08; 0.21 and 0.84, respectively. The findings will assist the design of irrigation management protocols for acai trees that are better tailored to satisfy crop water requirements. This will allow improved water use efficiency, ensuring tree crop sustainability.

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Section: Introductionmentioning

confidence: 99%

Estimation of evapotranspiration and single and dual crop coefficients of acai palm in the Eastern Amazon (Brazil) using the Bowen ratio system

Sousa

Fernandes²,

Tavares

et al. 2021

Irrig Sci

View full text Add to dashboard Cite

show abstract

“…Additionally, the reliability of the thermocouples may reduce during the winter due to the interference of low temperature. An uncertainty power supply from the solar panel may also cause the fluctuations in voltage and further in the winter which reduced the reliability of the data [39]. These factors are inevitable objective factors that contribute to the decreased reliability of instruments during the winter.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Two Surface Renewal Methods for Calculating the Sensible Heat Flux over a Tea Field Ecosystem in Hilly Terrain

et al. 2023

Agronomy

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Seasonal drought happens frequently in the lower slope hilly areas of China, which leads to a huge economic loss to China’s famous tea production. An accurate determination of the evapotranspiration (ET) value of different seasons can provide a crucial decision parameter for irrigation management. The surface renewal (SR) method is an accurate and inexpensive method compared with the eddy covariance (EC) method, which is widely used to calculate the sensible heat flux (H). The latent heat flux (LE) evapotranspiration can be estimated indirectly when combined with the energy–balance equation. This research investigated the traditional and improved calculation methods of H (SRsnyder and SRchen), based on the surface renewal theory, over a tea field for one year. The calculation accuracy was obtained from the statistical analysis between the SR and EC methods. Different months’ applicability was evaluated to determine the best calculation method for the tea field. The traditional calculation method (SRsnyder) is based on the van slope model using the second, third, and fifth structure function. The improved SR model (SRchen) introduces a third order temperature function and friction velocity for calculation. The results indicate that SRchen shows a good calculation accuracy of H in the spring seasons (February to April), summer (May to July), and autumn (August to October). The determination coefficients of regression analysis (R2) ranges were [0.66, 0.88] with most values greater than 0.8. The root mean square error (RMSE) ranges were [34.15, 69.22] W/m2. However, during this period, SRsnyder had a poor calculation accuracy of H, and the range of R2 was [0.45, 0.74] with the RMSE ranges of [32.28, 63.25] W/m2. In the winter (November to January), the calculation accuracy of both models was relatively low with R2 almost 30% lower than that of other seasons. Therefore, this study suggests the use of the SRchen method to estimate the H of a tea field ecosystem in the low slope hilly area of the Yangtze River region in the spring, summer, and autumn. While in the winter, the SRsnyder method is recommended.

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Desempenho Do Método Do Balanço De Energia - Razão De Bowen Na Estimativa Da Evapotranspiração De Referência

Cited by 2 publications

References 7 publications

Estimation of evapotranspiration and single and dual crop coefficients of acai palm in the Eastern Amazon (Brazil) using the Bowen ratio system

Estimation of evapotranspiration and single and dual crop coefficients of acai palm in the Eastern Amazon (Brazil) using the Bowen ratio system

Evaluation of Two Surface Renewal Methods for Calculating the Sensible Heat Flux over a Tea Field Ecosystem in Hilly Terrain

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