The local geological and sedimentological architecture of the deposit and its lithofacies were investigated locally through trenches using both particle size analysis and sedimentological approach.
This information was extended to the whole work by combining several geophysical techniques, i.e.
In addition, soil-column and batch experiments were performed to estimate hydrodispersive parameters by tracer experiments and the geochemical properties of lithofacies for a model pollutant, copper (Cu).
All these data were implemented into Hydrus to model flow and solute transfer through a 2D soil profile with a precise description of the hydrofacies at the basin scale (flow domain 14x2 m2).
The results are highly relevant because they emphasize different types of preferential flow due to either the presence of capillary barriers, drainage layers or pipe flow, which may be responsible for the enhancement of pollutant transfer.
In particular, they show that sand lenses may play an important role whereas unconnected gravels may have insignificant effect on flow.
A correspondent gently suggests that I may be seen to have made a faux pas with my previous post.
Referencing the title, he asks: "How does one address a duke's eldest son's younger son?
Infiltration basins are part of the best management practices.
They are aimed at infiltrating stormwater to prevent additional collection and treatment through rainwater systems.
In the suburbs of Lyon (France), many of these infiltration basins were built over fluvio-glacial deposit.
These basins have been the subject of research programs on vadose zone flow and fate of pollutants.
This study focuses on the impact of the heterogeneity of the fluvio-glacial deposit on both flow pattern and solute transfer.