Calibration and validation of an aerodynamic method to estimate the spatial variability of sensible and latent heat fluxes over a dripirrigated Merlot vineyard
Author
dc.contributor.author
Carrasco Benavides, Marcos
Author
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Ortega Farias, Samuel
Author
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Morales Salinas, Luis
Author
dc.contributor.author
Poblete Echeverria, Carlos
Author
dc.contributor.author
Chavez, Jose L.
Admission date
dc.date.accessioned
2018-07-03T14:33:33Z
Available date
dc.date.available
2018-07-03T14:33:33Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
International Journal of Remote Sensing, 2017
Vol. 38, No. 24, 7473–7496
es_ES
Identifier
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10.1080/01431161.2017.1317943
Identifier
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https://repositorio.uchile.cl/handle/2250/149405
Abstract
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A study was carried out to calibrate and validate the aerodynamic temperature method for estimating the spatial variability of the sensible (H) and latent (LE) heat fluxes over a drip-irrigated merlot vineyard located in the Maule Region, in Chile. For this study, measurement of energy balance components and meteorological data were collected from the 2006 to 2010 growing seasons. The experimental plot was composed of a 4.25 ha of 'Merlot' vineyard, which was equipped with an Eddy-Covariance system and an automatic weather station. The k-fold cross-validation method was utilized to tune and validate a vineyard surface aerodynamic temperature (T-aero) model, considering all of the days when Landsat scenes and ground measurements of meteorological data and surface energy balance (SEB) were available. Then, the satellite-based estimations of Taero were utilized to calculate the surface aerodynamic resistance (r(ah)) and, subsequently, heat fluxes of H and LE. Results indicated that the estimated H and rah values were not significantly different to those measured in the vineyard (95% significance level) showing a root mean square (RMSE) and mean absolute error (MAE) between 34-29 W m(-2) and 1.01-0.78 s m(-1), respectively. Satellite-based computations of LE were somewhat higher than those measured at the time of satellite overpass (RMSE = 63 W m(-2); MAE = 56 W m(-2)), presumably due to the biases embedded in the net radiation (R-n) and soil heat flux (G) computations. The proposed SEB method based on T-aero is very simple to implement, presenting similar accuracies on ET mapping to those computed by complex satellite-based models.
es_ES
Patrocinador
dc.description.sponsorship
Chilean government through the National Commission for Scientific and Technological Research (CONICYT)
1100714
D10I1157
Universidad de Talca
Calibration and validation of an aerodynamic method to estimate the spatial variability of sensible and latent heat fluxes over a dripirrigated Merlot vineyard