A numerical technique for simulation of the effect of soil nitrogen transport and transformations on groundwater contamination |
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Authors: | Mohsen Mehran Jahan Noorishad Kenneth K Tanji |
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Institution: | (1) D'Appolonia Consulting Engineers, Inc., 92714 Irvine, California;(2) Earth Sciences Division, Lawrence Berkeley Laboratory, 94720 Berkeley, California;(3) Department of Land, Air, and Water Resources, University of California, 95616 Davis, California |
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Abstract: | Two numerical models, one for the vadose zone and the other for the aquifer system, are utilized to predict nitrate pollution
potential in groundwater. Transport by dispersion and convection of mobile species of nitrogen, ammonium ion exchange, first
order nitrogen transformations, and nitrogen plant uptake are included in the formulation for the vadose zone. Transport of
nitrate in the aquifer is assumed to be affected only by dispersion-convection phenomena. Justifications for one-dimensional
conceptualization of flow in the vadose zone and two-dimensional representation for the aquifer, under various field conditions,
are presented. To illustrate the concept, a simple hypothetical problem is solved. The approach presented here provides an
efficient means of long-term simulation of large-scale field problems. |
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Keywords: | |
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