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Contamination by Slaked Fragments with Sorbed Compounds in a Structured Soil

^a Université du Québec, INRS-Eau, 2800 rue Einstein, C.P. 7500, Sainte-Foy (QC), Canada, G1V 4C7
^b Université du Québec, INRS-Eau, 2800 rue Einstein, C.P. 7500, Sainte-Foy (QC), Canada, G1V 4C7, or Laboratoire d'Hydrogéologie, Université d'Avignon, 33 rue Pasteur, 84000, Avignon, France
^c Département des Sols et de Génie Agroalimentaire, FSAA, Université Laval. Québec (QC), Canada, G1K 7P4

View larger version (37K): [in a new window]   Fig. 1. Structural setup of the experimental stand. A soil under study is kept in a polyvinyl chloride (PVC) sampling cylinder. An array of ten mini-tensiometers and ten time domain reflectometry (TDR) moisture mini-probes is installed, marking off ten monitored layers of soil.

View larger version (33K): [in a new window]   Fig. 2. Variation in wetting rates in the soil profile. Each value in this figure is the mean of three replicates. Bars represent the least significant differences (LSD) between treatments at P 0.05. Treatments at each depth marked by different letters are significantly different.

View larger version (35K): [in a new window]   Fig. 3. Variation in mean weight diameter (MWD) in the soil profile, before and after wettings. Initial is the MWD value in the soil profile before wetting. Each value in this figure is the mean of three replicates. The depths are reported as the midpoint. Bars represent the least significant differences (LSD) between treatments at P 0.05. Treatments at each depth marked by different letters are significantly different.

View larger version (26K): [in a new window]   Fig. 4. Variation in soil particle transport in the soil profile following three wetting treatments. Each value in this figure is the mean of three replicates. The depths are reported at the midpoint. Bars represent the least significant differences (LSD) between treatments at P 0.05. Treatments at each depth marked by different letters are significantly different.

View larger version (27K): [in a new window]   Fig. 5. Variation in soil particle transport in the soil profile following three levels of precipitation (10, 30, and 50 mm). Each value in this figure is the mean of three replicates. The depths are reported as the midpoint. Bars represent the least significant differences (LSD) between treatments at P 0.05. Treatments at each depth marked by different letters are significantly different.

View larger version (37K): [in a new window]   Fig. 6. Observed and fitted travel depth probability distribution functions for different wetting treatments and infiltration rates. The curves were obtained by the least-square method: the parameters obtained by the fitting of Eq. [3] and [4] are presented in Table 2.