Modelling of N-movements on catchment scale - a tool for analysis and decision making

• DOI: 10.1007/bf00749943
• Publication Date: 2004-12-06T13:11:42Z
• Authors: Merete Styczen; B�rge Storm
• Keywords: 13. Climate action; 0207 environmental engineering; 02 engineering and technology; 15. Life on land; 6. Clean water

The modelling system described by Styczen and Storm (1993) simulates nitrogen transformation as well as water and nitrogen transport on a regional scale and can be used to evaluate effects of changes in the land use or in agricultural practices on the water quality in the groundwater and in the streams. It may be used to evaluate variations in time and space, and to predict the time lag from new strategies are implemented until measurable results are obtained. A case study was carried out on the 425 km2 large Karup River catchment in Denmark for the period 1968–88, and the paper presents the data required to set up the model and results from the simulations. Most of the data and information required could be extracted from existing databases, reports, and statistical yearbooks while information on changes in management practices came from local agricultural advisers. The simulations are compared to measurements in part of the Karup River catchment.