Transport upscaling in a clay-rich sedimentary formation using multi-porosity models
For many applications in hydrogeology, like performance assessment of possible nuclear waste repositories, it is not possible to solve transport at the known local scale. To resolve this, upscaling is needed. Two upscaling methods for contaminant transport are considered here: the macro-dispersion approach and the multi-porous one. We study numerically advective transport on (block-) upscaled 3D heterogeneous hydraulic conductivity fields of a specific strongly heterogeneous formation. The heterogeneous structures are large compared to the domain size. We analyzed the resulting breakthrough curves, and particularly the changes of peak travel time, with respect to possible upscaling methodologies. We find that for flow mainly parallel to the large scale heterogeneities and for smaller blocks the use of an advection dispersion type equation seems still reasonable. But for larger blocks a multi-porosity model becomes necessary as the peak arrival time is delayed. In vertical direction a similar effect is seen but now the peak travel time is fastened up with increasing block size. Also in this case the, multi-porosity model is a possible upscaling technique, but the conceptual picture for porosity has to be modified.
M.Willmann W.Kinzelbach F.Stauffer
Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland
国际会议
武汉
英文
417-420
2009-09-20（万方平台首次上网日期，不代表论文的发表时间）