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Nitrate and Chloride Loading to Groundwater from an Irrigated North-Central U.S. Sand-Plain Vegetable Field

Central Wisconsin Groundwater Center, 1900 Franklin St., Univ. of Wisconsin, Stevens Point, WI 54481

View larger version (39K): [in a new window]   Fig. 1. Location map and distribution of multilevel piezometers in the study field.

View larger version (17K): [in a new window]   Fig. 2. Schematic view of a multilevel piezometer. Sampling points are the 18 flexible tubes and the rigid "backbone," which forms the deepest point.

View larger version (16K): [in a new window]   Fig. 3. Arrival and downward movement of annual Cl pulse in one study field multilevel piezometer (MLP). Five snapshots are shown of 23 profiles constructed over the period. (See text.)

View larger version (38K): [in a new window]   Fig. 4. Idealized movement of recharge water and solutes beneath a region A in an irrigated field. Recharge water infiltrating at a given time descends as a plane through the vadose zone. After reaching the water table, its movement is predominantly horizontal but a downward component remains, which accounts for the tilt in V's vertical axis. Recharge originating between two dates occupies an oblique prism bracketed by elevations z1 and z2.