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Master thesis

Apport de l'imagerie radar pour la cartographie de l'humidité du sol et des croûtes biologiques en zone sahélienne

Abstract : Soil degradation is alarming in many places. The arid area named Sahel is an hostile place for anthropological development and farming is very problematic due to soil poverty with a lack of organic matter. However, development of biological crusts on naked fallows and plateaus plays an important ecological role for soils. Physical characteristics and microbiotic activity of these crusts allow soil enrichment and stabilisation. In-depth studies of this crust seems necessary and its monitoring on a regional scale would be facilitated in using remote sensing. This study is a part of the BioCrust project, a project on microbiotic crust vulnerability and soil degradation in Sahelian zone. Optical imaging allows to establish probability maps of biological crust presence. Radar imaging brings new information on soil moisture. Soil moisture seems correlated to crust, thus relations between radar data and soil moisture can be draw up then between soil moisture and crust. Seasonal evolution of soil moisture will also be taken into account. The purpose of the study is to obtain reliable soil moisture map in order to enrich possibilities of biological crust mapping afterward. The study concerns two places in Niger of 100 km² each on which ground statements were simultaneously picked up with the acquisition of TerraSAR-X pictures. Multi dates data allow seasonal soil moisture. Soil moisture mapping on naked grounds on both sites of Niger and on various dates was done with a precision of 2.34% for the best case. However relationship between soil moisture and crust location remains to be established. These results will contribute to the implementation of a soil degradation and biocrust vulnerability monitoring tool in front of climate and land use changes.
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Master thesis
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  • HAL Id : hal-02593342, version 1
  • IRSTEA : PUB00028992

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P. Camus. Apport de l'imagerie radar pour la cartographie de l'humidité du sol et des croûtes biologiques en zone sahélienne. Sciences de l'environnement. 2010. ⟨hal-02593342⟩

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