Quantifying turbulent energy fluxes and evapotranspiration in agricultural field conditions: A comparison of micrometeorological methods

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F18%3A43913816" target="_blank" >RIV/62156489:43210/18:43913816 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.agwat.2018.07.041" target="_blank" >https://doi.org/10.1016/j.agwat.2018.07.041</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.agwat.2018.07.041" target="_blank" >10.1016/j.agwat.2018.07.041</a>

Result language

angličtina

Original language name

Quantifying turbulent energy fluxes and evapotranspiration in agricultural field conditions: A comparison of micrometeorological methods

Original language description

Accurate estimation of energy fluxes and evapotranspiration (ET) in agricultural systems is critically needed, especially for water resource sustainability, soil moisture monitoring and irrigation. Numerous micrometeorological methods have become commercially available. Considering the eventual trade-off between cost and accuracy, it is important to evaluate these methods to provide recommendations for practical purposes. Therefore, we tested five different techniques at one field in the region of Central Europe dominated by rainfed farming but suffers from drought spells. In an intensive campaign, we used eddy covariance (EC), large aperture and surface layer scintillometers, the Bowen ratio energy balance (BREB), and the surface renewal (SR) methods to estimate the sensible (H) and latent (λET) heat fluxes of winter wheat and bare soil with harvest residues during two months in summer 2015. At the half-hourly level, the methods showed varying agreement under different field conditions. While H estimated by EC and scintillometry agreed well, there was an underestimation of λET by EC compared to the other methods, most likely due to energy balance non-closure. The λET estimated by the BREB method showed good agreement with the λET obtained by scintillometry when the Bowen ratio (β) was high and with the λET obtained by EC when β 0. Our study confirmed good reliability of scintillometers across wide range of meteorological conditions. Although the SR method provided the most inferior agreement with other methods at half-hourly basis, it was deemed to be valuable when longer averaging periods were used. Over the entire experiment, mean daily ET estimated by scintillometry (2.6 mm dMINUS SIGN 1), BREB (2.3 mm dMINUS SIGN 1), and SR (2.9 mm dMINUS SIGN 1) showed reasonable agreement while EC (1.6 mm dMINUS SIGN 1) significantly underestimated. This indicates that low cost methods (BREB and SR) are sufficient for water management purposes when a daily and longer time scales are important. Further, parallel deploying of BREB and SR can provide additional diagnostics and increase the confidence in ET estimates.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

40500 - Other agricultural sciences

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Agricultural Water Management

ISSN

0378-3774

e-ISSN

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Volume of the periodical

209

Issue of the periodical within the volume

30 October

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

249-263

UT code for WoS article

000443661600025

EID of the result in the Scopus database

2-s2.0-85050972951