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Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils

Adrien Lienur, Andreas Cédric Schomburg, Pascal Turberg, Claire Guenat, Renée-Claire Le Bayon & Philip Brunner

Résumé This paper presents the coupling of freeze-core sampling with X-ray CT scanning for the analysis of the soil structure of fine-grained, low-cohesive soils. We used a medical scanner to image the 3D soil structure of the frozen soil cores, providing X-ray CT data at a millimetric resolution over freeze-cores that are up to 62.5 cm long and 25 cm wide. The obtained data and the changes in gray level values could be successfully used to identify and characterize different soil units with distinctly different physical properties. Traditional measurements of soil bulk density, carbon and particle size analyses were conducted within each of the identified soil units. These observations were used to develop a 3D model of soil bulk density and organic matter distribution for five freeze-cores obtained at a restored floodplain in Switzerland. The millimetric X-ray CT scanning was applied to detect the impact of freeze-coring on the soil structural integrity. This allows identifying undisturbed zones, a critical precondition for any subsequent assessment of soil structure. The proposed coupling is thought to be applicable to a wide range of other low-cohesive soil types and has a large potential for applications in hydrogeology, biology or soil science.
   
Mots-clés Freeze-core; X-ray computed tomography (CT); Soil structure; Soil sampling technique; 3D soil model; Alluvial soil
   
Citation Lienur, A., Schomburg, A. C., Turberg, P., Guenat, C., Le Bayon, R. C., & Brunner, P. (2017). Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils. Geoderma, 308, 171-186.
   
Type Article de périodique (Anglais)
Date de publication 15-12-2017
Nom du périodique Geoderma
Volume 308
Pages 171-186
URL https://doi.org/10.1016/j.geoderma.2017.08.010
Liée au projet Ecosystem engineers' contribution to soil structure forma...