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Solute Transport Modeling under Cultivated Sandy Soils and Transient Water Regime

Département des sols et de génie agro-alimentaire, FSAA, Université Laval, Sainte-Foy, QC, Canada G1K 7P4

View larger version (24K): [in a new window]   Fig. 1. Drainable lysimeter.

View larger version (16K): [in a new window]   Fig. 2. Mean and standard deviation of soil volumetric water content (0- to 90-cm soil depth) at 15 lysimeter locations during 1996.

View larger version (29K): [in a new window]   Fig. 3. Normalized bromide flux concentrations (Cf) measured at the bottom of drainable lysimeters (z = 100 cm) and convective lognormal transfer (CLT) functions fitted with Cf.

View larger version (19K): [in a new window]   Fig. 4. Variance and dispersion of fitted convective lognormal transfer (CLT) functions increasing with soil depth.

View larger version (33K): [in a new window]   Fig. 5. Normalized bromide resident concentrations (Cr) measured at five depths and six dates in Field 5, and convective lognormal transfer (CLT) function either fitted with Cr (—) (Table 4) or with Cf (– –) (Table 3). Cross centers and vertical bars represent mean and standard deviation of three measured Cr, and horizontal bars represent depth of soil sampling. The CLT parameters are reported in the top left graphic. Number of days following Br- application (t) and cumulative drainage (I) are also reported in every graphic.

View larger version (21K): [in a new window]   Fig. 6. Normalized bromide resident concentrations (Cr) measured at a 105-cm depth in Field 5 (Crz = 105 cm). Convective lognormal transfer (CLT) functions either fitted with Cr measured at 105 cm (Table 6) [— f(Cr)z = 105 cm], with Cr measured at all depths (Table 4) [- - - f(Cr) Field 5], or with Cf measured in lysimeters (Table 3) [- — - f(Cf) Field 5].