Die Küste, 81 (2014), 369-392 
389 
Figure 19: Net sediment deposition integrated over the boundary of the German Bight derived 
from UnTRIM (red), TELEMAC (green) and MARINA (light blue) and duration of high wind 
(> 18 m/s) at Elelgoland — control sections for balancing are marked in the right panel. 
The highest net deposition quantity of die investigated yearly simulations is 42 Mtyr 1 . 
This amount is only reproduced in other years toal/2orl/3 amount. The comparison 
of the different model results shows e.g. for die year 1998 a relatively good agreement 
(40.5 - 46.5 Mtyr 1 ). In 2006 die difference is distinct (30 Mt/a - 44 Mtyr 1 ). 
The comparison witii die duration of high wind speed shows a predominantly large 
correlation witii die net deposition quantity. This suggests tiiat meteorological forcing has 
a strong effect in relation to the magnitude and direction of die residual velocities / 
transport in die German Bight. 
The deptii variable distribution of die net transport mass is of special interest. 
Detailed analyses show tiiat a predominant portion is transported in a deptii range of 
between 10 - 20 m. The transport rates behind die East Frisian Islands, on the wadden 
area towards die coast, are noticeably smaller. 
7 Conclusion 
There are many reasons why the assessment of morphological conditions in the German 
Bight is associated with great uncertainties. The measuring techniques and field data in 
themselves fail to provide a reasonably sufficient level of accuracy. Of course, all models 
are based on numerous simplifications, and simulation models as such are also restricted 
due to die numerical approximation of physics and die limitations (construction, evolu 
tion ...) of computer systems. 
It will only be possible to obtain greater confidence concerning die reproduction, 
analysis and prediction of sediment transport and morphodynamics in die German Bight 
within a multidisciplinary approach. This integrated concept provides a broad consistent 
dataset for future analyses and numeric modelling of morphodynamic processes in the 
German Bight. 
Uncertainty can be reduced by adopting a multi-model approach to data and process 
based simulation models. The application of different spatial and temporal model im 
provements, as well as miscellaneous physical approximations in different modelling sys 
tems, will also improve the accuracy of the overall findings. 
The process-based modelling approach enables large area circulation and sediment 
transport processes in the entire German Bight to be simulated and analyzed. This is