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A novel watershed modeling technique of the fate and transport processes of nitrogen integrated into a surface and subsurface coupled fluid-flow simulation was developed. The developed technique enables to handle spatiotemporal dynamics of nitrogen loads, oxidation-reduction reactions including nitrification and denitrification by coupling transport processes of multiple chemical species and biogeochemical reaction kinetics in watershed scale. Dif ferent N-transformation processes and their interactions can be modeled depending on the site-specific characteristics and the available information. We applied the developed computer code to the actual fields with the different modeling approaches of fate and transport processes of nitrogen, and discussed the reproducibility of simulated results in surface and subsurface water environment. Results indicated that the model is successful in reproducing observed measurements of NO3 concentrations by employing the modeling method appropriate for the site characteristics.

Numerical modeling for simulating fate and reactive transport processes of nitrogen in watershed and discussion on applicability to actual fields