Uncertainty analysis and validation of the estimation of effective hydraulic properties. - Agropolis Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2013

Uncertainty analysis and validation of the estimation of effective hydraulic properties.

Résumé

The determination of the hydraulic properties of heterogeneous soils or porous media remains challenging. In the present study, we focused on determining the effective properties of heterogeneous porous media with an analysis of the uncertainties at the Darcy scale. Preliminary, experimental measurements of the hydraulic properties of each component of the heteregeneous medium were obtained. The properties of the effective medium, representing an equivalent homogeneous material, had been determined numerically by simulating a water flow in a 3D representation of the heteregeneous medium, under steady-state scenarios, using its components properties. One of the major aspects of this study was to take into account the uncertainties of these properties in the computation and evaluation of the effective properties. This was done using a bootstrap method. Numerical evaporation experiments were conducted both on the heterogeneous and on the effective homogeneous materials to evaluate the effectiveness of this upscaling approach. First, the impact of the uncertainties of the component properties on the simulated water matric potential was found to be high for the heterogeneous material configuration. Second, it was shown that the use of the upscaling method led to a reduction of this impact. Finally, the adequacy between the means of the simulations for the two configurations confirmed the suitability of the upscaling approach used, even in the case of dynamic scenarios. The methodology proposed in this study is generic. It was applied here to green roof substrates, a two-component media composed of bark compost and pozzolan, used in the construction of buildings.
Fichier principal
Vignette du fichier
WRR_V19.pdf (679.45 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00793526 , version 1 (22-02-2013)
hal-00793526 , version 2 (11-03-2013)
hal-00793526 , version 3 (18-10-2013)
hal-00793526 , version 4 (24-03-2014)

Identifiants

  • HAL Id : hal-00793526 , version 2

Citer

Arnaud Mesgouez, Samuel Buis, Stéphane Ruy, Gaëlle Lefeuve-Mesgouez. Uncertainty analysis and validation of the estimation of effective hydraulic properties.. 2013. ⟨hal-00793526v2⟩
344 Consultations
431 Téléchargements

Partager

Gmail Facebook X LinkedIn More