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Numerical Analysis of Flow and Transport from Trickle Sources on a Spatially Heterogeneous Hillslope

AMEC Earth & Environmental Ltd., 160 Traders Blvd. East, Suite 110, Mississauga, ON, Canada, L4Z 3K7

View larger version (69K): [in a new window]   Fig. 1. Contours of the simulated pressure head, , in the vertical x1x2 plane at the end of an irrigation event. Results are depicted for both the sandy (top) and the clay (bottom) soils for Q = 312.5 and 1250 cm3 cm–1 h–1, respectively. Terrain slope is 20%

View larger version (40K): [in a new window]   Fig. 2. Velocity fields in the vertical x1x2 plane just after an irrigation event for both the sandy (top) and the clay (bottom) soils. Note that the direction of the arrow is equal to the direction of the vector field at its base point; the longest vector is scaled to a length of 1, and all other vectors are scaled proportionately. Profiles of the components of the mean velocity vector, averaged over the two inner drip laterals, <u1> and <u2> , are also included in this figure. Terrain slope is 20%.

View larger version (46K): [in a new window]   Fig. 3. Velocity fields in the vertical x1x2 plane just before an irrigation event for both the sandy (top) and the clay (bottom) soils. Note that the direction of the arrow is equal to the direction of the vector field at its base point; the longest vector is scaled to a length of 1, and all other vectors are scaled proportionately. Profiles of the components of the mean velocity vector, averaged over the two inner drip laterals, <u1> and <u2> , are also included in this figure. Terrain slope is 20%.

View larger version (63K): [in a new window]   Fig. 4. Contours of the chloride concentration, c, in the vertical x1x2 plane. Results are depicted for the sandy soil (top) and the clay soil (bottom), for elapsed times of t = 10 d and t = 56 d, respectively. Terrain slope is 20%.

View larger version (23K): [in a new window]   Fig. 5. Profiles of the chloride concentration below the two inner drip line laterals and midway between the two drip line laterals, corresponding to the chloride concentrations in Fig. 4.

View larger version (32K): [in a new window]   Fig. 6. Trajectories of the centroid of the solute body associated with the two inner drip line laterals under transient flow conditions and in the presence of water uptake by plant roots. Negative values of the horizontal coordinate indicate uphill deflection of the centroid.

View larger version (27K): [in a new window]   Fig. 7. Trajectories of the centroid of the solute body associated with the two inner drip line laterals under steady-state flow conditions and in the absence of water uptake by plant roots. Negative values of the horizontal coordinate indicate uphill deflection of the centroid.

View larger version (21K): [in a new window]   Fig. 8. Longitudinal (a,b) and transverse (c,d) components of the coordinate vector of the centroid of the volume of water extracted by the plant roots, Ru, associated with the two inner drip line laterals, as functions of time, for the different soils and different slopes of the terrain. Negative values of the horizontal coordinate indicate uphill deflection of the centroid.