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Gorrab A., Simonneaux Vincent, Zribi M., Saadi S., Baghdadi N., Chabaane Z. L., Fanise Pascal. (2017). Bare soil hydrological balance model "MHYSAN" : calibration and validation using SAR moisture products and continuous thetaprobe network measurements over bare agricultural soils (Tunisia). Journal of Arid Environments, 139, 11-25. ISSN 0140-1963

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Lien direct chez l'éditeur doi:10.1016/j.jaridenv.2016.12.005

Titre
Bare soil hydrological balance model "MHYSAN" : calibration and validation using SAR moisture products and continuous thetaprobe network measurements over bare agricultural soils (Tunisia)
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000393629500002
AuteursGorrab A., Simonneaux Vincent, Zribi M., Saadi S., Baghdadi N., Chabaane Z. L., Fanise Pascal.
SourceJournal of Arid Environments, 2017, 139, p. 11-25. ISSN 0140-1963
RésuméThe present study highlights the potential of multi-temporal X-band Synthetic Aperture Radar (SAR) moisture products to be used for the calibration of a model reproducing soil moisture (SM) variations. We propose the MHYSAN model (Modele de bilan HYdrique des Sols Agricoles Nus) for simulating soil water balance of bare soils. This model was used to simulate surface evaporation fluxes and SM content at daily time scale over a semi-arid, bare agricultural site in Tunisia (North Africa). Two main approaches are considered in this study. Firstly, the MHYSAN model was successfully. calibrated for seven sites using continuous thetaprobe measurements at two depths. Then the possibility to extrapolate local SM simulations at distant sites, based on soil texture similarity only, was tested. This extrapolation was assessed using SAR estimates and manual thetaprobe measurements of SM recorded at these distant sites. The results reveal a bias of approximately 0.63% and 3.04%, and an RMSE equal to 6.11% and 4.5%, for the SAR volumetric SM and manual thetaprobe measurements, respectively. In a second approach, the MHYSAN model was calibrated using seven very high-resolution SAR (TerraSAR-X) SM outputs ranging over only two months. The simulated SM were validated using continuous thetaprobe measurements during 15 months. Although the SM was measured on only seven different dates for the purposes of calibration, satisfactory results were obtained as a result of the wide range of SM values recorded in these seven images. This led to good overall calibration of the soil parameters, thus demonstrating the considerable potential of Sentinel-1 images for daily soil moisture monitoring using simple models.
Plan de classementBioclimatologie [072] ; Télédétection [126] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.TUNISIE ; ZONE SEMIARIDE
LocalisationFonds IRD [F B010069274]
Identifiant IRDfdi:010069274
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010069274

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