Estimation of evapotranspiration using the crop canopy temperature at field to regional scales in large irrigation district

Huang, Lingxu; Cai, Jiabing; Zhang, Baozhong; Chen, He; Bai, Lanqiang; Zheng, Wei; Peng, Zhigong

doi:10.1016/j.agrformet.2019.02.024

Cited by 17 publications

(11 citation statements)

References 39 publications

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“…To this end, major effort has been devoted over the past three decades to improve remote sensingbased methods that provide spatially distributed surface fluxes maps using airborne and satellite data (Nehal et al, 2017). These methods can be classified into three main categories: a) Methods using simple empirical relationships relating daily ET to an instantaneous surface temperature measurement (Trezza et al, 2013;Huang et al, 2019); 2) Methods using deterministic relationships based on more complex models such as Soil-Vegetation-Atmosphere Transfer models (SVAT) (Olioso et al, 2005;Bigeard et al, 2019); 3) Methods based on ET estimation as the residual term of the energy balance equation, which can be divided into two categories:…”

Section: Introductionmentioning

confidence: 99%

Application of SEBAL and Ts/VI Trapezoid Models for Estimating Actual Evapotranspiration in the Algerian Semi-Arid Environment to Improve Agricultural Water Management

Fellah

Hamimed

Miloudi

et al. 2021

Rev. bras. meteorol.

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Accurate spatio-temporal estimation of evapotranspiration (ET) and surface energy fluxes is crucial for many agro-environmental applications, including the determination of water balance, irrigation scheduling, agro-ecological zoning, simulation of global changes in land use and forecasting crop yields. Remote sensing based energy balance models are presently most suitable for estimating ET at both temporal and spatial scales. This study presents an intercomparison of ET maps over the Habra plain in western Algeria obtained with two different models: Ts/VI trapezoid (Surface temperature/Vegetation Index Trapezoid Model) and SEBAL (Surface Energy Balance Algorithm for Land). Ts/VI trapezoid is the most used model, due to its simplicity, ease of use, few data input requirements and relatively high accuracy. It allows estimating ET directly by using the Priestley-Taylor equation. Whereas SEBAL allows estimating ET as the residual term of the energy balance equation, by using a rather complex hot and cold pixel based contextual approach to internally calibrate sensible heat flux through an iterative approach. The data set consists of four Landsat-8 OLI/TIRS images acquired on 2018-2019 and some ground measurements. In conclusion, the results show that SEBAL and Ts/VI trapezoid models provide comparable outputs and suggest that both the two models are suitable approaches for ET mapping over agricultural areas where ground measurements are scarce or difficult to collect.

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Section: Introductionmentioning

confidence: 99%

Application of SEBAL and Ts/VI Trapezoid Models for Estimating Actual Evapotranspiration in the Algerian Semi-Arid Environment to Improve Agricultural Water Management

Fellah

Hamimed

Miloudi

et al. 2021

Rev. bras. meteorol.

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“…Empirical models employ simple statistical approaches to estimate ET without considering water and heat transport processes from soil moisture and vegetation (Zeng & Cai, 2016; Zhong, Ma, Hu, et al, 2019; Zou, Zhong, Ma, Hu, & Feng, 2018). For example, Huang et al (2019) obtained ET time series based on a function of canopy and air temperature difference in a large irrigation district. One disadvantage of empirical models is that the site‐specific parameters of ET models are difficult to extend to other regions, making these models of limited use in practice.…”

Section: Introductionmentioning

confidence: 99%

Attribution of Evapotranspiration Changes in Humid Regions of China from 1982 to 2016

et al. 2020

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This study quantifies the influences of climate variation and vegetation greening on the changes in evapotranspiration (ET) over 110 humid catchments of China from 1982 to 2016. A process‐based model considering climate and vegetation changes is employed to estimate ET. The simulated ET compared well with the observed values based on the flux measurements and water balance equation, with the coefficients of determination above 0.62. During the study period, environmental change of the study area was characterized by the increases in air temperature and leaf area index, that is, climate warming and vegetation greening. Annual ET increased at 104 catchments with the trends ranging from 0.01 to 6.2 mm yr−2. The numerical experiment approach and sensitivity method are used to attribute ET changes to climate variation and vegetation greening. The results show that the contributions of climate variation to ET changes estimated by the two methods are 90.6% and 91.3%, respectively, whereas the contributions of vegetation greening to ET changes are only 9.4% and 8.7%, indicating that climate variation controls ET changes in the study area. However, vegetation greening alters the proportions of ET components, which contributes 59.0%–62.0% to the increase in the ratio of transpiration to ET. This study quantifies the roles of climate and vegetation changes in the dynamics of ET, suggesting that more concerns should be paid on the interactions between ecological processes and hydrological cycle in humid regions.

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“…But with the increase of the distance from the measurement site, the estimates of irrigation requirements based on the EC measurements may greatly deviate from the truth if the possible variation sources (e.g., crop variety, soil texture, and soil productivity) with a variation range greater than the EC footprint area take serious effects on crop growth. To acquire more accurate water stress state and water requirements of crops in this case, other site-specific ET measurements such as that based on canopy temperature (Jones et al 2018;Huang et al 2019) can be a substitute for the EC data measured at a site far from the target field, or sitespecific soil or crop measurements should be employed Hsieh et al (2000). [Colour online.…”

Section: Analysis Of the Difference In The Observed Et Between The Ec...mentioning

confidence: 99%

A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain

Wang

Wenju³

et al. 2021

Can. J. Soil. Sci.

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Accurate determination of evapotranspiration (ET) has tremendous potential in guiding irrigation and improving the efficiency of water resources utilization in the North China Plain. Eddy covariance (EC) method is currently a popular method for determining field scale evapotranspiration. However, due to varying foot print and unclosed energy balance, the applicability of EC in different regions needs to be tested and corrected. In present work, we compared the ET of the winter wheat-summer maize rotation cropland measured by the EC method with the ET measured by large-scale lysimeters on different time scales. The degree of energy balance closure of EC measurements in this region is 78%. After adjusted by using Bowen-ratio forced closure method, the ET monitored by EC is comparable to those monitored by large-scale lysimeters. The results also indicated that the consistency of the observed ET by the EC and lysimeters got better with an increasing time scale, especially for the multi-year average ET values with a relative deviation of less than 1%. The short-time events such as irrigation and precipitation, and the mismatch of the varying footprint area of the EC and the small fixed source area of the lysimeter should be responsible for the discrepancy of ET in two methods on daily scale. However, the factors of crop biomass, total available water and local climate condition exert more effects on the observed ET on large time scale. Overall, the EC technique is responsible for ET measurement of winter wheat-summer maize rotation cropland of the North China Plain.

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Estimation of evapotranspiration using the crop canopy temperature at field to regional scales in large irrigation district

Cited by 17 publications

References 39 publications

Application of SEBAL and Ts/VI Trapezoid Models for Estimating Actual Evapotranspiration in the Algerian Semi-Arid Environment to Improve Agricultural Water Management

Application of SEBAL and Ts/VI Trapezoid Models for Estimating Actual Evapotranspiration in the Algerian Semi-Arid Environment to Improve Agricultural Water Management

Attribution of Evapotranspiration Changes in Humid Regions of China from 1982 to 2016

A validation of eddy covariance technique for measuring crop evapotranspiration on different time scales in the North China Plain

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