Future directions for advanced evapotranspiration modeling: Assimilation of remote sensing data into crop simulation models and SVAT models |
| |
Authors: | A Olioso Y Inoue S Ortega-FARIAS J Demarty J-P Wigneron I Braud F Jacob P Lecharpentier C OttlÉ J-C Calvet N Brisson |
| |
Institution: | (1) INRA-CSE, Domaine Saint-Paul, 84914 Avignon Cedex 9, France;(2) NIAES, Ecosystem Research Group, Tsukuba, Japan;(3) CITRA, Universidad de Talca, Chile;(4) INRA, Bioclimatologie, Villenave d'Ornon, France;(5) LTHE (UMR 5564 CNRS, INPG, IRD, UJF), Grenoble, FRANCE and CEMAGREF, Lyon, France;(6) ESAP, Toulouse, France;(7) CETP, Vélizy, France;(8) CNRM, Météo-France, Toulouse, France |
| |
Abstract: | Soil-Vegetation-Atmosphere Transfer Models (SVAT) and Crop Simulation Models describe physical and physiological processes
occurring in crop canopies. Remote sensing data may be used through assimilation procedures for constraining or driving SVAT
and crop models. These models provide continuous simulation of processes such as evapotranspiration and, thus, direct means
for interpolating evapotranspiration between remote sensing data acquisitions (which is not the case for classical evapotranspiration
mapping methods). They also give access to variables other than evapotranspiration, such as soil moisture and crop production.
We developed the coupling between crop, SVAT and radiative transfer models in order to implement assimilation procedures in
various wavelength domains (solar, thermal and microwave). Such coupling makes it possible to transfer information from one
model to another and then to use remote sensing information for retrieving model parameters which are not directly related
to remote sensing data (such as soil initial water content, plant growth parameters, physical properties of soil and so on).
Simple assimilation tests are presented to illustrate the main techniques that may be used for monitoring crop processes and
evapotranspiration. An application to a small agricultural area is also performed showing the potential of such techniques
for retrieving evapotranspiration and information on irrigation practices over wheat fields. |
| |
Keywords: | assimilation of data into models crop simulation model evapotranspiration irrigation remote sensing soil-vegetation-atmosphere transfer model |
本文献已被 SpringerLink 等数据库收录! |
|