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Modeling Pollutant Release from a Surface Source during Rainfall Runoff

IIMI, CIMMYT, Apartado #370, P.O. Box 60326, Houston, TX 77205

View larger version (19K): [in a new window]   Fig. 1. Schematic of the conceptual model

View larger version (28K): [in a new window]   Fig. 2. Experimental flume setup. The flume is metal

View larger version (40K): [in a new window]   Fig. 3. Kinematic model experiment at two rainfall intensities (laboratory results). Calculated steady state flow depths were 1.8 and 2.5 mm for the 15.2 mm h-1 and 25.4 mm h-1 rain intensities, respectively. Triangles and diamonds = observed data

View larger version (50K): [in a new window]   Fig. 4. Kinematic model results from the no-crust and 50%-crust experimental runs. Calculated steady state flow depth was 2.4 mm. Laboratory data: squares = no crust, circles = 50% crust

View larger version (41K): [in a new window]   Fig. 5. Pollutant transport results, data, and model (laboratory results). Triangles = observed data for no-crust experiment; squares = observed data for 50%-crust experiment; circles = observed data for complete-crust experiment; lines = respective model predictions

View larger version (42K): [in a new window]   Fig. 6. Field layout

View larger version (26K): [in a new window]   Fig. 7. Kinematic runoff model results and field data (field results): circles = observations, line = model predictions

View larger version (24K): [in a new window]   Fig. 8. Pollutant transport model vs. pollutant delivery from the field (field results). Triangles = observations, line = model predictions. SP = soluble reactive phosphorus