Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 11 Large-scale hydrological modelling and the European Union water policies 2007 10.5194/adgeo-11-69-2007 http://www.adv-geosci.net/11/69/2007/ http://www.adv-geosci.net/11/69/2007/adgeo-11-69-2007.html http://www.adv-geosci.net/11/69/2007/adgeo-11-69-2007.pdf 69 75 2007-06-13 Determination and ranking of target areas in catchments for the implementation of nitrogen reduction measures B. Tetzlaff b.tetzlaff@fz-juelich.de R. Kunkel W. Schäfer F. Wendland Research Centre Jülich, Institute of Chemistry and Dynamics of the Geosphere (ICG), Institute IV: Agrosphere, 52425 Jülich, Germany State Authority for Mining, Energy and Geology, Lower Saxony, 30655 Hannover, Germany The implementation of the EU Water Framework Directive (EU-WFD) forms the background of the WAgriCo-project (Water Resources Management in Cooperation with Agriculture). WagriCo concentrates on the development of nitrogen management options adapted to hydrological and agro-economic site conditions and at demonstrating new participation approaches and technologies suitable for setting-up programmes of measures. The article outlines the conceptual model approach and its application in the pilot region "Große Aue" (Northern Germany). Furthermore the process of delineating priority areas is described, which act as spatial targets for the adaptation of regionally differentiated nutrient reduction measures. Böttcher, J., Strebel, O., and Duynisveld, W. H. M.: Kinetik und Modellierung gekoppelter Stoffumsetzungen im Grundwasser eines Lockergesteinsaquifers, Geologisches Jahrbuch C, 51, 3–40, 1989. Gömann, H., Kreins, P., Kunkel, R., and Wendland, F.: Model based impact analysis of policy options aiming at reducing diffuse pollution by agriculture: a case study for the river Ems and a sub-catchment of the Rhine, Environ. Modell. Softw., 20(2), 261–271, 2004. Henrichsmeyer, W., Cypris, Ch., Löhe, W., Meudt, M., Sander, R., and v. Sothen, F.: Entwicklung eines gesamtdeutschen Agrarsektormodells RAUMIS 96, Endbericht zum Kooperationsprojekt, Institut für Agrarpolitik, Marktforschung und Wirtschaftssoziologie der Universität Bonn, Institute für Betriebswirtschaft, Strukturforschung und Landwirtschaftliche Marktforschung der Bundesforschungseinrichtung für Landwirtschaft (FAL), Bonn, Braunschweig, Germany, 1996. Kunkel, R. and Wendland, F.: WEKU; a GIS-supported stochastic model of groundwater residence times in upper aquifers for the supraregional groundwater management, Environ. Geol., 30(1–2), 1–9, 1997. Kunkel, R. and Wendland, F.: The GROWA98 model for water balance analysis in large river basins; the River Elbe case study, J. Hydrol., 259(1–4), 152–162, 2002. Kunkel, R., Bach, M., Behrendt, H., and Wendland, F.: Groundwater-borne nitrate intakes into surface waters in Germany, Water Sci. Technol., 49(3), 11–19, 2004. Kunkel, R. and Wendland, F.: Diffuse Nitrateinträge in die Grund- und Oberflächengewässer von Rhein und Ems, Schriften des Forschungszentrums Jülich, Reihe Umwelt/Environment, Band 62, Forschungszentrum Jülich GmbH, Jülich, Germany, 2006. Walther, W., Reinstorf, F., Pätsch, F., and Weller, D.: Management tools to minimize nitrogen emissions into groundwater in agricultural used catchment areas, northern low plain of Germany, Proceedings of "XXX IAHR Congress: Water engineering and research in a learning society", 24–29 August 2003, Thessaloniki, Greece, Vol B, 747–754, 2003. Wendland, F., Bach, M., Behrendt, H., and Kunkel R.: Integrated modelling of groundwater-borne nitrate intakes into the river Elbe basin (German part), Proceedings of the 9th International Specialized Conference on River Basin Management, Edinburgh, Scotland, 2002.