Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC

The quantification of evapotranspiration from agricultural areas is important for agriculture water management, especially in arid and semiarid regions where water deficiency is becoming a major constraint in economic welfare and sustainable development. Remote sensing based energy balance models ar...

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Main Authors: Abderrahmane Hamimed, Laounia Nehal, Abdelkader Khaldi, Habib Azzaz
Format: Article
Language:English
Published: Physio-Géo 2014-07-01
Series:Physio-Géo
Subjects:
Online Access:http://journals.openedition.org/physio-geo/4063
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spelling doaj-94d1ff4aa12b4786a46ccb8fc7e707ea2020-11-25T02:05:33ZengPhysio-GéoPhysio-Géo1958-573X2014-07-01819721310.4000/physio-geo.4063Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRICAbderrahmane HamimedLaounia NehalAbdelkader KhaldiHabib AzzazThe quantification of evapotranspiration from agricultural areas is important for agriculture water management, especially in arid and semiarid regions where water deficiency is becoming a major constraint in economic welfare and sustainable development. Remote sensing based energy balance models are presently most suited for estimating evapotranspiration at both field and regional scales.In this contribution, METRIC (Mapping EvapoTranspiration at high Resolution with Internalized Calibration), a remote sensing of spatializing, has been applied for the estimation of actual evapotranspiration in the Sersou plain, a semiarid region in Algeria with heterogeneous surface conditions. Two images acquired by the Lansat 7 satellite on March 13th, 2012 and April 30th, 2012 were used. The METRIC model followed an energy balance approach, where evapotranspiration is estimated as the residual when the net radiation, sensible heat flux and soil heat flux are known. Different moisture indicators derived from the evapotranspiration were then calculated: evaporative fraction, PRIESTLEY-TAYLOR parameter and surface resistance to evaporation. These calculated indicators facilitate the quantitative diagnosis of moisture stress status in pixel basis. The obtained results concern the validation of the used model for spatial distribution analysis of evapotranspiration and moisture indicators. The evaluation of evapotranspiration and surface energy fluxes are accurate enough for the spatial variations of evapotranspiration rather satisfactory than sophisticated models without having to introduce an important number of parameters in input with difficult accessibility in routine. In conclusion, the results suggest that METRIC can be considered as an operational approach to predict actual evapotranspiration from agricultural areas having limited amount of ground information.http://journals.openedition.org/physio-geo/4063Algeriaenergy balanceevapotranspirationLandsatMETRICremote sensing
collection DOAJ
language English
format Article
sources DOAJ
author Abderrahmane Hamimed
Laounia Nehal
Abdelkader Khaldi
Habib Azzaz
spellingShingle Abderrahmane Hamimed
Laounia Nehal
Abdelkader Khaldi
Habib Azzaz
Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC
Physio-Géo
Algeria
energy balance
evapotranspiration
Landsat
METRIC
remote sensing
author_facet Abderrahmane Hamimed
Laounia Nehal
Abdelkader Khaldi
Habib Azzaz
author_sort Abderrahmane Hamimed
title Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC
title_short Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC
title_full Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC
title_fullStr Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC
title_full_unstemmed Contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en Algérie par utilisation de la télédétection et du modèle METRIC
title_sort contribution à la spatialisation de l'évapotranspiration d'un agro-système semi-aride en algérie par utilisation de la télédétection et du modèle metric
publisher Physio-Géo
series Physio-Géo
issn 1958-573X
publishDate 2014-07-01
description The quantification of evapotranspiration from agricultural areas is important for agriculture water management, especially in arid and semiarid regions where water deficiency is becoming a major constraint in economic welfare and sustainable development. Remote sensing based energy balance models are presently most suited for estimating evapotranspiration at both field and regional scales.In this contribution, METRIC (Mapping EvapoTranspiration at high Resolution with Internalized Calibration), a remote sensing of spatializing, has been applied for the estimation of actual evapotranspiration in the Sersou plain, a semiarid region in Algeria with heterogeneous surface conditions. Two images acquired by the Lansat 7 satellite on March 13th, 2012 and April 30th, 2012 were used. The METRIC model followed an energy balance approach, where evapotranspiration is estimated as the residual when the net radiation, sensible heat flux and soil heat flux are known. Different moisture indicators derived from the evapotranspiration were then calculated: evaporative fraction, PRIESTLEY-TAYLOR parameter and surface resistance to evaporation. These calculated indicators facilitate the quantitative diagnosis of moisture stress status in pixel basis. The obtained results concern the validation of the used model for spatial distribution analysis of evapotranspiration and moisture indicators. The evaluation of evapotranspiration and surface energy fluxes are accurate enough for the spatial variations of evapotranspiration rather satisfactory than sophisticated models without having to introduce an important number of parameters in input with difficult accessibility in routine. In conclusion, the results suggest that METRIC can be considered as an operational approach to predict actual evapotranspiration from agricultural areas having limited amount of ground information.
topic Algeria
energy balance
evapotranspiration
Landsat
METRIC
remote sensing
url http://journals.openedition.org/physio-geo/4063
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