%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Galleguillos, M.
%A Jacob, Frédéric
%A Prevot, L.
%A Faundez, C.
%A Bsaibes, A.
%T Estimation of actual evapotranspiration over a rainfed vineyard using a 1-D water transfer model : A case study within a Mediterranean watershed
%D 2017
%L fdi:010069474
%G ENG
%J Agricultural Water Management
%@ 0378-3774
%K Heterogeneous landscape ; HYDRUS-1D ; Vadose zone ; Water table
%K FRANCE
%M ISI:000397351400008
%P 67-76
%R 10.1016/j.agwat.2017.01.006
%U https://www.documentation.ird.fr/hor/fdi:010069474
%> https://www.documentation.ird.fr/intranet/publi/2017/05/010069474.pdf
%V 184
%W Horizon (IRD)
%X The current study aims to evaluate the capabilities of soil water balance modeling to estimate ET for very different conditions of rainfed grapevine water status, within a vineyard landscape that depicts heterogeneities in canopy, soil and water table conditions. We calibrated the HYDRUS-1D model against measurements of the soil moisture profile within seven contrasted sites, we validated HYDRUS-1D sim-ulations against ET estimates derived from eddy covariance (EC) measurements within two contrasted sites, and we analyzed the temporal dynamics of the HYDRUS-1D ET simulations throughout almost two growth cycles for the seven sites. The calibration of HYDRUS-1D was correctly achieved, with a relative RMSE of 20% on average. Validation of HYDRUS-1D simulations against EC measurements was satisfactory, with RMSE values of about 40W m(-2) at the hourly timescale and 0.5 mm d(-1) at the daily timescale. HYDRUS-1D was able to provide consistent time series of ET within the seven contrasted sites and throughout the two growth cycles. We conclude that HYDRUS-1D simulations can be used as an alternative to EC measurements within rainfed vineyards, to alleviate experimental efforts for device cost and maintenance. Further, HYDRUS-1D simulations can be used for characterizing spatial variabili-ties and temporal dynamics, assessing impact of pedological conditions and land use on ET, or validating remote sensing retrievals over regional extents.
%$ 072