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| Titel |
Soil surface moisture estimation over a semi-arid region using ENVISAT ASAR radar data for soil evaporation evaluation |
| VerfasserIn |
M. Zribi, A. Chahbi, M. Shabou, Z. Lili-Chabaane, B. Duchemin, N. Baghdadi, R. Amri, A. Chehbouni |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 1 ; Nr. 15, no. 1 (2011-01-26), S.345-358 |
| Datensatznummer |
250012607
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| Publikation (Nr.) |
 copernicus.org/hess-15-345-2011.pdf |
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| Zusammenfassung |
| The present paper proposes a method for the evaluation of soil evaporation,
using soil moisture estimations based on radar satellite measurements. We
present firstly an approach for the estimation and monitoring of soil
moisture in a semi-arid region in North Africa, using ENVISAT ASAR images,
over two types of vegetation covers. The first mapping process is dedicated
solely to the monitoring of moisture variability related to rainfall events,
over areas in the "non-irrigated olive tree" class of land use. The
developed approach is based on a simple linear relationship between soil
moisture and the backscattered radar signal normalised at a reference
incidence angle. The second process is proposed over wheat fields, using an
analysis of moisture variability due to both rainfall and irrigation. A
semi-empirical model, based on the water-cloud model for vegetation
correction, is used to retrieve soil moisture from the radar signal.
Moisture mapping is carried out over wheat fields, showing high variability
between irrigated and non-irrigated wheat covers. This analysis is based on
a large database, including both ENVISAT ASAR and simultaneously acquired
ground-truth measurements (moisture, vegetation, roughness), during the
2008–2009 vegetation cycle. Finally, a semi-empirical approach is proposed
in order to relate surface moisture to the difference between soil
evaporation and the climate demand, as defined by the potential evaporation.
Mapping of the soil evaporation is proposed. |
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