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Pré-Publication, Document De Travail Année : 2013

Uncertainty analysis and validation of the estimation of effective hydraulic properties: application to green roof substrate

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 at the Darcy scale of green roof substrates (GRS), highly heterogeneous porous media used in the construction of buildings. Preliminary, experimental measurements of the hydraulic properties of each component of the GRS, namely bark compost and pozzolan, were obtained. The properties of the effective medium, representing an equivalent homogeneous material to the GRS, had been determined numerically by simulating a water flow in a 3D representation of the GRS, 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 this upscaling approach. First, the impact of the uncertainties of the components 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. In our context, it could be applied to optimizing the hydraulic properties of composite porous materials in order to improve the hydraulic functioning of green roof substrates.
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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 1

Citer

Arnaud Mesgouez, Samuel Buis, Stéphane Ruy, Gaëlle Lefeuve-Mesgouez. Uncertainty analysis and validation of the estimation of effective hydraulic properties: application to green roof substrate. 2013. ⟨hal-00793526v1⟩
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