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Evapotranspiration and crop coefficients for a super intensive olive orchard. An application of SIMDualKc and METRIC models using ground and satellite observations
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Orientador(es)
Resumo(s)
The estimation of crop evapotranspiration (ETc) from the reference evapotranspiration (ETo) and a standard
crop coefficient (Kc) in olive orchards requires that the latter be adjusted to planting density and
height. The use of the dual Kc approach may be the best solution because the basal crop coefficient Kcb
represents plant transpiration and the evaporation coefficient reproduces the soil coverage conditions
and the frequency of wettings. To support related computations for a super intensive olive orchard,
the model SIMDualKc was adopted because it uses the dual Kc approach. Alternatively, to consider the
physical characteristics of the vegetation, the satellite-based surface energy balance model METRIC™ –
Mapping EvapoTranspiration at high Resolution using Internalized Calibration – was used to estimate
ETc and to derive crop coefficients. Both approaches were compared in this study. SIMDualKc model
was calibrated and validated using sap-flow measurements of the transpiration for 2011 and 2012. In
addition, eddy covariance estimation of ETc was also used. In the current study, METRIC™ was applied
to Landsat images from 2011 to 2012. Adaptations for incomplete cover woody crops were required to
parameterize METRIC. It was observed that ETc obtained from both approaches was similar and that crop
coefficients derived from both models showed similar patterns throughout the year. Although the two
models use distinct approaches, their results are comparable and they are complementary in spatial
and temporal scales
Descrição
Palavras-chave
density coefficient dual crop coefficients Eddy covariance evapotranspiration partition remote sensing sap-flow measurement
Contexto Educativo
Citação
"Journal of Hydrology". ISSN 0022-1694. 519 (2014). p.2067-2080
Editora
Elsevier