In the framework of the project daNUbs (Nutrient Management in the Danube Basin and its
Impact on the Black Sea) the MONERIS emission model is used for the basin wide calculation of nutrient
(nitrogen and phosphorus) emissions in the Danube Basin. The MONERIS model was developed and
successfully applied for German river catchments. Based on investigations in selected test regions (case
studies) the daNUbs approach is to check the applicability of the MONERIS emission model for the specific
conditions of the Danube Basin in more detail than is possible with a basin wide application. Six case
studies with areas of 400–3,500 km2 and several subcatchments have been selected in order to represent
different conditions along the Danube Basin. In this study region intensive data collection and enhanced
monitoring has been performed in order to raise the database significantly above the generally available
data. Water balance as well as nutrient balance calculations have been performed with the MONERIS
model as well as with other approaches. Results are compared to each other and to data from monitoring.
Results up till now showed the applicability and sensitivity of the MONERIS approach in different conditions
of the Danube Basin (e.g. emissions via groundwater). They indicated that the nitrogen retention in the
catchments is well described with the MONERIS model.