Die Küste, 81 (2014), 369-392 
384 
Figure 12: Model domain of the North Sea: UnTRIM, TELEMAC and MARINA (left) and a 
nested model of the North Sea and German Bight for DELFT3D (right). 
5.2 Boundary conditions 
The boundary conditions applied for all model tuns are die same for all model systems in 
AufMod. An overview for this is given in Fig. 13. 
Water levels 
• tidal constituents from global tidal model 
FES2004 (Lyardet at., 2006) 
• surge data from BSH/DWD North Atlantic model 
River discharge 
• daily discharge values In the German Bight 
otherwise seasonal / long-term averages 
• Baltic Sea: constant value 
Salinity (UnTRIM) 
• climatology {Janssen et at., 1999) 
wind stress, air pressure 
• DWD forecast model 
Waves 
• fetch length at boundary 
Sediments 
• AufMod seabed-model v.3 
• constant SPM concentration 
Figure 13: Boundary conditions for all model runs used in AufMod. 
5.3 Model calibration and validation 
The process of calibration and subsequent validation of morphodynamic simulation 
models has been operated in several steps. 
An analysis of the uncertainties of the measured basis data was developed before initi 
ating a basic model calibration. This was also die case for die measured data used for val 
idation purposes. The inaccuracy of data throughout the whole data flow (measurements