Micro- and macro-scale water retention properties of granular soils: contribution of the X-Ray CT-based voxel percolation method - Université de Lorraine Accéder directement au contenu
Article Dans Une Revue Soil Research Année : 2019

Micro- and macro-scale water retention properties of granular soils: contribution of the X-Ray CT-based voxel percolation method

Erika Shiota
  • Fonction : Auteur
Anne-Julie Tinet
Fabrice Golfier

Résumé

Water retention in granular soils is a key mechanism for understanding transport processes in the vadose zone for various applications from agronomy to hydrological and environmental sciences. The macroscopic pattern of water entrapment is mainly driven by the pore-scale morphology and capillary and gravity forces. In the present study, the drainage water retention curve (WRC) was measured for three different granular materials using a miniaturised hanging column apparatus. The samples were scanned using X-ray micro-computed tomography during the experiment. A segmentation procedure was applied to identify air, water and solid phases in 3D at the pore-scale. A representative elementary volume analysis based on volume and surface properties validated the experimental setup size. A morphological approach, the voxel percolation method (VPM) was used to model the drainage experiment under the assumption of capillary-dominated quasi-static flow. At the macro-scale, the VPM showed a good capability to predict the WRC when compared with direct experimental measurements. An in-depth comparison with image data also revealed a satisfactory agreement concerning both the average volumetric distributions and the pore-scale local topology. Image voxelisation and the quasi-static assumption of VPM are likely to explain minor discrepancies observed at low suctions and for coarser materials.
Fichier principal
Vignette du fichier
SR18179_ArticleErika_preprint.pdf (2.05 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02012512 , version 1 (13-02-2019)

Identifiants

Citer

Erika Shiota, Toshifumi Mukunoki, Laurent Oxarango, Anne-Julie Tinet, Fabrice Golfier. Micro- and macro-scale water retention properties of granular soils: contribution of the X-Ray CT-based voxel percolation method. Soil Research, 2019, ⟨10.1071/sr18179⟩. ⟨hal-02012512⟩
88 Consultations
270 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More