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Measured and Predicted Solute Transport in a Tile Drained Field

^a International Water Management Institute IWMI c/o ICRISAT Patancheru, AP 502 324 India
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^c USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011
^d Dep. of Agricultural and Biosystems Engineering, Iowa State Univ., Ames, IA 50011

View larger version (20K): [in a new window]   Fig. 1. Field experiment layout (S# and R# refer to sprinkler and rain gauge locations. The numbers refer to TDR probe locations for surface measurements).

View larger version (26K): [in a new window]   Fig. 2. Examples of measured and fitted surface resident concentrations versus time. The empty circles refer to observed concentrations during tracer application, solid circles refer to observed concentrations during water application, and the solid lines refer to the fitted concentrations.

View larger version (21K): [in a new window]   Fig. 3. Irrigation and hydrograph of tile flow.

View larger version (14K): [in a new window]   Fig. 4. Measured and predicted tile flux concentrations (0-cm irrigation depth refers to the start of tracer application that was followed by water application).