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| Titel |
Mapping crop evapotranspiration by integrating vegetation indices into a soil water balance model |
| VerfasserIn |
Simona Consoli, Daniela Vanella |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250104059
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| Publikation (Nr.) |
 EGU/EGU2015-3480.pdf |
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| Zusammenfassung |
| The approach combines the basal crop coefficient (Kcb) derived from vegetation indices (VIs)
with the daily soil water balance, as proposed in the FAO-56 paper, to estimate daily crop
evapotranspiration (ETc) rates of orange trees. The reliability of the approach to detect water
stress was also assessed. VIs were simultaneously retrieved from WorldView-2 imagery
and hyper-spectral data collected in the field for comparison. ETc estimated were
analysed at the light of independent measurements of the same fluxes by an eddy
covariance (EC) system located in the study area. The soil water depletion in the
root zone of the crop simulated by the model was also validated by using an in
situ soil water monitoring. Average overestimate of daily ETc of 6% was obtained
from the proposed approach with respect to EC measurements, evidencing a quite
satisfactory agreement between data. The model also detected several periods of
light stress for the crop under study, corresponding to an increase of the root zone
water deficit matching quite well the in situ soil water monitoring. The overall
outcomes of this study showed that the FAO-56 approach with remote sensing-derived
basal crop coefficient can have the potential to be applied for estimating crop water
requirements and enhancing water management strategies in agricultural contexts. |
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