HAL : ird-00425916, version 1

DOI : 10.1016/j.jhydrol.2005.03.027

Code IRD Horizon : fdi:010048026

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Journal of Hydrology 315 (2005) 117-125

A simple algorithm to estimate evapotranspiration from DAIS data: Application to the DAISEX campaigns

J.A. Sobrino (  Auteur correspondant ) 1, M. Gomez 1, J.C. Jimenez-Munoz 1, A. Olioso 2, A. Chehbouni 3

(2005)

The knowledge of evapotranspiration is of great interest in many applications such as assessing irrigation water use. In this paper, a methodology is presented to estimate evapotranspiration using the surface energy balance model S-SEBI (Simplified Surface Energy Balance Index) and the evaporative fraction. The method is applicable under the assumptions of constant atmospheric conditions and sufficient wet and dry pixels over the image. The model uses remotely sensed parameters such as albedo, MSAVI (Modified Soil Adjusted Vegetation Index) and surface temperature and emissivity images. The methodology has been applied over the Barrax test site, located in the province of Albacete (Castilla La Mancha, Spain), in the framework of the DAISEX (Digital Airborne Imaging Spectrometer Experiment) campaigns carried out by ESA (European Space Agency). Net radiation, soil heat fluxes and evapotranspiration have been obtained from DAIS images for alfalfa, corn and grass plots. The results show that alfalfa plot gives the highest values, around 5 mm dK1, whereas corn plot gives the lowest, around 3.5 mm dK1. The proposed methodology leading to an accuracy for the daily evapotranspiration lower than 1 mm dK1.

1 :	Department of Thermodynamics, Faculty of Physics
	Universidad de Valencia
2 :	Antenne de la Direction Scientifique Environnement - Ecosystèmes Cultivés et Naturels (AVIGNON DS ECONAT)
	Institut national de la recherche agronomique (INRA) : UA1051
3 :	Centre d'études spatiales de la biosphère (CESBIO)
	CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

domaine

:

Sciences du Vivant/Ecologie, Environnement/Ecosystèmes

mots-clés : Evapotranspiration – Evaporative fraction – Net radiation flux – Soil heat flux – DAIS – S-SEBI

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Contributeur : Dominique Bruel <>

Soumis le : Jeudi 22 Octobre 2009, 17:43:20

Dernière modification le : Vendredi 23 Octobre 2009, 17:06:14