In: Journal of Hydrology and Hydromechanics, vol. 65, no. 3
Erij Slimene - Laurent Lassabatere - Jiří Šimůnek - Thierry Winiarski - Remy Gourdon
Detaily:
Rok, strany: 2017, 209 - 221
Kľúčové slová:
Preferential flow; Heterogeneity; Lithology; Numerical modeling; Soil hydraulic properties; Boundary conditions;
HYDRUS-2D.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
An understanding of preferential flow in the vadose zone is crucial for the prediction of the fate of pollutants.
Infiltration basins, developed to mitigate the adverse effects of impervious surfaces in urban areas, are established above
strongly heterogeneous and highly permeable deposits and thus are prone to preferential flow and enhanced pollutant
transport. This study numerically investigates the establishment of preferential flow in an infiltration basin in the Lyon
suburbs (France) established over a highly heterogeneous glaciofluvial deposit covering much of the Lyon region. An investigation
of the soil transect (13.5 m long and 2.5 m deep) provided full characterization of lithology and hydraulic
properties of present lithofacies. Numerical modeling with the HYDRUS-2D model of water flow in the transect was
used to identify the effects of individual lithofacies that constitute the deposit. Multiple scenarios that considered different
levels of heterogeneity were evaluated. Preferential flow was studied for several values of infiltration rates applied
after a long dry period. The numerical study shows that the high contrast in hydraulic properties of different lithofacies
triggers the establishment of preferential flow (capillary barriers and funneled flow). Preferential flow develops mainly
for low water fluxes imposed at the surface. The role of individual lithofacies in triggering preferential flow depends on
their shapes (layering versus inclusions) and their sizes. While lenses and inclusions produce preferential flow pathways,
the presence of the surface layer has no effect on the development of preferential flow and it only affects the effective
hydraulic conductivity of the heterogeneous transect.
Ako citovať:
ISO 690:
Slimene, E., Lassabatere, L., Šimůnek, J., Winiarski, T., Gourdon, R. 2017. The role of heterogeneous lithology in a glaciofluvial deposit on unsaturated
preferential flow – a numerical study. In Journal of Hydrology and Hydromechanics, vol. 65, no.3, pp. 209-221. 0042-790X (until 2019) .
APA:
Slimene, E., Lassabatere, L., Šimůnek, J., Winiarski, T., Gourdon, R. (2017). The role of heterogeneous lithology in a glaciofluvial deposit on unsaturated
preferential flow – a numerical study. Journal of Hydrology and Hydromechanics, 65(3), 209-221. 0042-790X (until 2019) .