Die Küste, 81 (2014), 369-392 
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5 Numeric modelling toolbox 
Numerical simulation models have been established in recent decades as a prognostic 
engineering tool for die evaluation of large-scale sediment transport conditions in the 
German Bight, with a focus on the effects of: 
• pending climate change, 
• offshore renewable energy systems and their connection to the mainland and, last 
but not least, 
• the safety and efficiency of navigation 
It is important to bear in mind that the operation of morphodynamic simulation models 
is still subject to considerable uncertainty and that development work is still ongoing on 
both models and field measurement methods. 
In die context of using deterministic numerical models within AufMod a consistent 
multi-model approach was established as a numerical toolbox (Tab. 3). These models 
apply different process resolutions in order to estimate the spread of the results. All mod 
els were set up to cover the entire North Sea, including a finer grid resolution for the 
German Bight. Sediment transport due to tidal currents, wind-driven circulation and 
waves were taken into account. 
Table 3: Modelling systems used in AufMod. 
Time scale 
Hydrodynamics 
Waves 
Morphodynamics 
Short-term 
MARINA 
MARINA 
MARINA 
Day - 12 month 
Medium-term 
UnTRIM 
UnK 
SedIMorph 
1-10 years 
DELFT3D-FLOW 
SWAN 
DELFT3D-MOR 
Medium-term 
1-10 years 
Long-term 
10-100 years 
TELEMAC 
TOMAWAC 
SISYPHE 
5.1 Model domain (grid) 
The numerical toolbox encompassed the hydrodynamic and sediment transport model 
ling systems applying one domain (grid): UnTRIM2007 (CASULLI and ZANOLLI 2002), 
TELEMAC (Hervouet 2000) and MARINA (MilbradT, smile consult) (Fig. 12 left) 
and a two model domain concept operated by DELFT3D (LESSER et al. 2004; Fig. 12, 
right). In order to represent well determined meteorological and tidal conditions, all 
models were forced with the same boundary conditions for water level, river discharges 
and wind.