Dépôt numérique

Soil Salinity Characterization Using Polarimetric InSAR Coherence: Case Studies in Tunisia and Morocco.

Barbouchi, Meriem; Abdelfattah, Riadh; Chokmani, Karem; Ben Aissa, Nadhira; Lhissou, Rachid; El Harti, Abderrazzak (2015). Soil Salinity Characterization Using Polarimetric InSAR Coherence: Case Studies in Tunisia and Morocco. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing , vol. 8 , nº 8. p. 3823-3832. DOI: 10.1109/JSTARS.2014.2333535.

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The phenomenon of soil salinization in semi-arid regions is getting amplified and accentuated by both anthropogenic practices and climate change. Land salinization mapping and monitoring using conventional strategies are insufficient and difficult. Our work aims to study the potential of synthetic aperture radar (SAR) for mapping and monitoring of the spatio-temporal dynamics of soil salinity using interferometry. Our contribution in this paper consists of a statistical relationship that we establish between field salinity measurement and InSAR coherence based on an empirical analysis. For experimental validation, two sites were selected: 1) the region of Mahdia (central Tunisia) and 2) the plain of Tadla (central Morocco). Both sites underwent three ground campaigns simultaneously with three Radarsat-2 SAR image acquisitions. The results show that it is possible to estimate the temporal change in soil electrical conductivity (EC) from SAR images through the InSAR technique. It has been shown that the radar signal is more sensitive to soil salinity in HH polarization using a small incidence angle. However, for the HV polarization, a large angle of incidence is more suitable. This is, under considering the minimal influence of roughness and moisture surfaces, for a given InSAR coherence.

Type de document: Article
Mots-clés libres: soil salinity; Electrical conductivity (EC); interferometric synthetic aperture radar (InSAR) coherence; polarimetric synthetic aperture radar (SAR)
Centre: Centre Eau Terre Environnement
Date de dépôt: 02 mai 2018 19:39
Dernière modification: 02 mai 2018 19:39
URI: http://espace.inrs.ca/id/eprint/4676

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