Solute transport and retention in three‐dimensional fracture networks

摘要: Resolving the hydrodynamic control of retention is an important step in predictive modeling transport sorbing tracers fractured rock. The statistics resistance parameter beta [T/L] and related effective active specific surface area s(f) [1/L] are studied a crystalline rock volume on 100 m scale. Groundwater flow advective based generic boundary conditions realistic discrete fracture networks inferred from Laxemar site, southeast Sweden. overall consistent with water residence time tau; moments vary linearly distance, at least up to m. correlation between log tau predominantly linear, however, there significant dispersion; strongly depends assumed hydraulic law (theoretical cubic or empirical quadratic). Fast slow trajectories/segments network determine shape distribution that cannot be reproduced by infinitely divisible model over entire range; low value range median can reasonably well tempered one-sided stable density using exponent 0.35-0.7. percentiles seems converge Fickian type behavior 50