Die Küste, 81 (2014), 273-290 
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(NA, Fig. 1) with a horizontal resolution of about 10 km. Boundary values for die North- 
and Baltic Sea grid (NO, Fig. 2) are extracted from this setup. The North- and Baltic Sea 
grid has a horizontal resolution of about 5 km and 36 vertical layers at the maximum. 
Through the mentioned fully dynamical two-way nesting the finer coastal grid 
(KU, Fig. 3) with a horizontal resolution of about 900 m and a maximum of 24 vertical 
layers, which covers the inner German Bight and the Western Baltic, is integrated into the 
North- and Baltic Sea grid. Together diese two grids form the second setup (this setup 
will be called NOKU henceforth) of die model chain. The third set up is formed by the 
Elbe grid (EL, Fig. 4), which was mainly developed in the OPTEL-project (BORK and 
Müller-Navarra 2011; Müller-Navarra and Bork 2012). It has a horizontal reso 
lution of 90 m and a maximum of 7 vertical layers. In contrast to die calculations witiiin 
the OPTEL-project which used a two-way nesting to die coastal grid, the Elbe-grid is 
calculated as a standalone setup in operational mode. The boundary values are provided 
by the NOKLT setup. 
The number of vertical layers in die three 3D-grids NO, KLT and EL are a result of 
the same vertical partition. The upper 20 m are divided in ten layers of 2 m diickness. 
Between 20 m and 100 m water depth there are five layers of 3 m thickness and fourteen 
layers with a thickness of 5 m. In water deptiis below 100 m the resolution is relatively 
coarse with layer thicknesses up to 200 m. 
The described setups are die 4th version, which has been developed and applied at 
BSH, so that die whole system of setups will be called V4 subsequently. 
Figure 1: water depth of the NA-grid. Figure 2: water depth of the NO-grid, during 
calculation the grey shaded area is non-active 
due to the nesting.