Mapping daily evapotranspiration over a Mediterranean vineyard watershed
Résumé
Daily Evapo-Transpiration (ET) was mapped and validated at the regional extent over a vineyard landscape. The mapping was performed using the S-SEBI model along with ASTER imagery over two growth cycles. The validation exercise was conducted within a Mediterranean vineyard watershed, over seven sites that differed in canopy, soil and water conditions. Despite the use of a very simple model over a complex row structured landscape, the obtained accuracy (0.8 mm.d −1) was similar to those reported over simpler canopies with full covers, and corresponded to requirements for further applications in agronomy and hydrology, where daily ET can be assimilated into land surface models for calibration and control purposes. An analysis of the validation results suggested that, amongst the possible factors that could affect S-SEBI performances (spatial variability, vine water status, soil type and color, row orientation), the first order influence was row orientation.
Domaines
Milieux et Changements globaux Ingénierie de l'environnement Optique / photonique Traitement du signal et de l'image [eess.SP] Interfaces continentales, environnement Géophysique [physics.geo-ph] Hydrologie Ecologie, Environnement Bioclimatologie Sciences agricoles Agronomie Electromagnétisme
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