Deutsche Hydrographische Zeitschrift - German Journal of Hydrography
468
bottom. This is also represented in maps of simulated
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 anticyclonic
gyre appears. In the bottom layer a southwestward
current into the inner German Bight is
simulated which is caused by long periods of offshore
winds during the measuring campaign (see
Fig. 2). In the next chapter, these and other model
results will be discussed in more detail and compared
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
