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Long-Term Solute Transport under Semi-Arid Conditions

Pedon to Field Scale

^a Alberta Agriculture, Food and Rural Development, Irrigation Branch, 100, 5401 First Avenue South, Lethbridge, AB, Canada T1J 4V6
^b University of Alberta, 3rd Floor University Hall, Edmonton, AB, Canada T6G 2J9
^c Department of Renewable Resources, 751 General Services Building, University of Alberta, Edmonton, AB, Canada T6G 2H1

View larger version (56K): [in a new window]   Fig. 1. Layout of field site showing topography; location of two KCl strips; positions of the field, pedon, and intensive transects; and position of background core.

View larger version (48K): [in a new window]   Fig. 2. Three-dimensional layout of field site showing topography (exaggerated 15 times), boundaries for catchment area calculations, increase in soil water storage (2001–2003) and corresponding sample locations, location of two KCl strips from original (1966 and 1971) experiment, and positions of field-scale transect soil cores.

View larger version (40K): [in a new window]   Fig. 3. Field-scale transect (a) elevation and catchment basin area (five-core floating-point average), (b) interpolated 2001 to 2003 increase in water storage and Cl– mean travel depth and (c) Cl– mass recovery as a function of position.

View larger version (46K): [in a new window]   Fig. 4. Average soil water and normalized resident Cl– breakthrough curve for each of the transects, including (a and d) field-scale, (b and e) pedon-scale, and (c and f) intensive transects, indicating 95% confidence intervals ( = 0.05).

View larger version (25K): [in a new window]   Fig. 5. Probability density function of Cl– mean travel depth variance as a function of spatial scale for the (a) field-scale, (b) pedon-scale, and intensive transects.