Présentation le 19 mai 2022 par Behshad Koohbor, BRGM, dans le cadre des séminaires d’HydroSciences
Abstract :
Discrete Fracture Matrix Model (DFMM) offer clear insights into fluid exchange and mass transport/heat transfer between the porous matrix and fracture in the vicinity of conduits.
The applicability of DFMM to field studies with realistic assumptions (e.g. often involving large spatial and/or temporal scales) is often limited; not only because it requires
detailed fracture characterization, but also as it involves excessive computational efforts.
The applicability of our method and developed tool is then demonstrated in a study concerning the effect of climate change on groundwater resources in a karst aquifer/spring system in El Assal, Lebanon.
Simulations, including recharge predictions under climate change scenarios, are carried out for about 80 years, up to 2099.
This study demonstrates the applicability of our proposed scheme to deal with real field cases involving large time and space scales with highly variable recharge.
Our results indicate that the water-table level is sensitive to the presence of fractures, where neglecting fractures leads to an overestimation of the available groundwater amount.
Furthermore, the flexibility and versatility of the model to embrace new modules and physics are briefly discussed. Primary insights into the potentials of the choice of the numerical schemes
for being applied on new physics, including the electrical current in porous media and electrical resistivity evolution, are examined and have been shown to have significant potentials.
The proposed numerical approach is generic for DFMM and can be extended to different 2D and 3D finite-element frameworks.
Keywords: discrete fracture matrix model; electrical resistivity; method of lines; mixed hybrid finite element method; unsaturated fractured porous media.
