Deutsche Hydrographische Zeitschrift - German Journal of Hydrography
468
bottom. This is also represented in maps of simulat
ed mean Eulerian currents calculated for the whole
measuring campaign. Figure 3 shows model results
in the area of UFS DB for the surface and bottom
layers.
In the surface layer, residual currents mostly
run parallel to the depth contours, with eastward
currents near UFS DB and northwestward currents
northeast of Helgoland. West of Helgoland an anti-
cyclonic gyre appears. In the bottom layer a south-
westward current into the inner German Bight is
simulated which is caused by long periods of off
shore winds during the measuring campaign (see
Fig. 2). In the next chapter, these and other model
results will be discussed in more detail and com
pared to the measurements.
total
speed interval (m/s)
0-3
3-6
6-9
9-12
12-15
15-18
direction
O
0
1
CO
o
0
UFS
0.9
2.6
1.8
-
-
-
5.3
mod
0.9
3.0
3.6
0.1
-
-
7.6
0
O
CD
1
0
O
CO
UFS
0.2
3.3
3.4
0.1
-
-
7.0
mod
0.6
3.2
2.7
-
-
-
6.6
60°- 90°
UFS
0.3
3.3
4.6
0.4
-
-
8.6
mod
0.7
5.5
7.6
0.8
-
-
14.4
90°-120°
UFS
0.6
3.3
6.8
0.1
-
-
10.8
mod
0.4
2.1
5.7
0.7
-
-
9.0
120°-150°
UFS
0.3
2.1
3.5
0.1
-
-
6.0
mod
0.1
1.3
1.0
-
-
-
2.5
150°-180°
UFS
0.2
1.1
0.5
-
-
-
1.9
mod
0.2
1.2
0.5
0.2
-
-
2.0
180°-210°
UFS
-
1.2
1.5
0.4
-
-
3.2
mod
-
1.9
1.3
0.9
0.2
-
4.4
210°-240°
UFS
0.5
1.9
4.3
1.0
-
-
7.8
mod
0.5
3.0
2.9
1.9
0.1
-
8.4
240°-270°
UFS
0.3
3.3
5.9
1.1
0.5
-
11.1
mod
0.8
3.3
4.0
1.7
1.7
<0.1
11.5
270°-300°
UFS
0.9
2.2
6.6
2.3
0.6
-
12.5
mod
0.3
3.0
3.9
1.2
0.5
-
8.9
300°-330°
UFS
1.0
5.5
3.5
0.6
0.1
-
10.7
mod
0.4
4.7
5.2
0.8
1.2
-
12.4
330°-360°
UFS
1.5
5.9
5.0
2.2
0.5
-
15.2
mod
1.3
5.7
3.0
2.0
0.4
-
12.4
total speed
UFS
7.7
35.7
47.4
8.3
1.8
0.0
%
mod
6.3
38.0
41.4
10.2
4.1
<0.0
%
UFS: local observations, mod: predicted model data
Table 2: Percentage frequency distribution of wind speed and direction
