Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 11 2 2007 10.5194/hess-11-997-2007 http://www.hydrol-earth-syst-sci.net/11/997/2007/ http://www.hydrol-earth-syst-sci.net/11/997/2007/hess-11-997-2007.html http://www.hydrol-earth-syst-sci.net/11/997/2007/hess-11-997-2007.pdf 997 1011 2007-03-22 Assessing the model performance of an integrated hydrological and biogeochemical model for discharge and nitrate load predictions T. Pohlert thorsten.pohlert@agrar.uni-giessen.de L. Breuer J. A. Huisman H.-G. Frede Institute for Landscape Ecology and Resources Management, Justus-Liebig-University Gießen, Heinrich-Buff-Ring 26, 35392 Gießen, Germany In this study, we evaluate the performance of the SWAT-N model, a modified version of the widely used SWAT version, for discharge and nitrate predictions at the mesoscale Dill catchment (Germany) for a 5-year period. The underlying question is, whether the model efficiency is sufficient for scenario analysis of land-use changes on both water quantity and quality. The Shuffled Complex Evolution (SCE-UA) algorithm is used to calibrate the model for daily discharge at the catchments outlet. Model performance is assessed with a split-sampling as well as a proxy-basin test using recorded hydrographs of four additional gauges located within the catchment. The efficiency regarding nitrate load simulation is assessed without further calibration on a daily, log-daily, weekly, and monthly basis as compared to observations derived from an intensive sampling campaign conducted at the catchments outlet. A new approach is employed to test the spatial consistency of the model, where simulated longitudinal profiles of nitrate concentrations were compared with observed longitudinal profiles. 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