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Current development and application of the modular Java based model JAMS to meet the targets of the EU-WFD in Germany.

The European Water Framework Directive (EU-WFD), implemented in the year of 2000, requires general ecological protection and a minimum chemical standard to be obtained in all European surface waters at different spatial and temporal scales. To meet these requirements the knowledge of spatially distributed sources and movements of contaminants, e.g. nutrients entries on stream systems is essential. In Germany some major water quality problems are related to non-point sources of nitrogen export. For a collaborative pilot study the need was identified to integrate solute turnover and transport processes into the object-oriented Java based JAMS modeling framework (Jena Adaptable Modelling System). The innovative potential of JAMS was enhanced to consider, describe and model hydrologic and solute processes within the appropriate spatial and temporal context. Moreover JAMS provides the possibility of exchanging process modules according to individual needs and problems. This paper will give a conceptual overview of the current developments on the implementation and integration of process modules for different nitrogen components and their turnover, and soil temperature and crop growth as well as options for land use management scenarios. The preliminary results of an application in a mesoscale catchment in Germany are also described.