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Field-Scale Preferential Transport of Water and Chloride Tracer by Depression-Focused Recharge

^a Soil Science Dep., North Dakota State Univ., Fargo, ND 58105
^b USDA-CSREES-NRE, Washington, DC

View larger version (39K): [in a new window]   Fig. 1. Three-dimensional view of quarter section showing ground surface topography, subsurface drains, drain access manholes (T03 and T04), plot locations, and observation wells (E7 and E8)

View larger version (26K): [in a new window]   Fig. 2. Profile view of instrumentation, ground surface, and mean water table at the E7.6 transect depressional site. TDR = time domain reflectometry

View larger version (40K): [in a new window]   Fig. 3. Three-dimensional plot of water table over time measured at the E7.6 depressional site

View larger version (15K): [in a new window]   Fig. 4. Cumulative rainfall and/or irrigation measured at the E7.6 depressional area

View larger version (31K): [in a new window]   Fig. 5. Soil liquid water content at 15, 30, and 61 cm in the bottom of the depression at E7.6. Vertical lines at 14 Mar. 1994 and 3 Apr. 1994 enclose the period of thaw. TDR = time domain reflectometry

View larger version (31K): [in a new window]   Fig. 6. Soil temperature at 15, 30, and 61 cm and water table elevation measured in the bottom of the depression at E7.6. Ground surface elevation is 397 m and vertical lines at 14 Mar. 1994 and 3 Apr. 1994 enclose the period of thaw

View larger version (64K): [in a new window]   Fig. 7. Time series contours of chloride concentration and water table elevation at E7.2 (a), E7.6 (b), and E7.8 (c). Circles indicate spatial and temporal sample location

View larger version (26K): [in a new window]   Fig. 8. Chloride concentration in subsurface drain effluent and drain flow measured at (a) Manhole T04 downstream from the depressional plot (G2) and (b) Manhole T03 downstream from the level plot (G6)