Simulation of nitrogen and phosphorus leaching in a structured soil using GLEAMS and a new submodel, "PARTLE"
1998
Shirmohammadi, A. | Ulen, B. | Bergstrom, L.F. | Knisel, W.G.
The potential negative impact of agricultural chemicals on the quality of surface and ground water resources is a worldwide concern. The complexity of factors affecting nonpoint source pollution makes experimental assessment of the environmental consequences of different management strategies laborious and expensive. Therefore, one feasible method is to use the existing research database to validate and modify the computer models, then use the models to simulate the long-term impact of these systems. In this study the hydrologic and nutrient loss data from a subsurface drained, structured clay soil in southwest Sweden was used to examine the applicability of GLEAMS to simulate the drainage discharge and N and P concentrations in the discharge water. The results indicated that GLEAMS was capable of simulating drainage discharge, nitrate-N and dissolved-P losses reasonably well, but there were no algorithms to simulate the particulate-P losses via drain tiles. Therefore, a submodel, "PARTLE" was developed and tested. Our results indicate that the PARTLE submodel, in association with the GLEAMS model, provided reasonable estimates of particulate-P loss via drainage in this soil. The study concluded that considering the impact of preferential flow and the ratio of annual drainage discharge to annual precipitation is necessary for proper predictions of particulate-P in structured soils.
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