Regions of freshwater influence (ROFIs) - Introduction to the Physical and Biological Oceanography of Shelf Seas - page 274

v (m s -1 )

u (m s -1 )

(a)

0.0 0.1 0.2 0.0 0.1 0.2

16 16

12 12

8

4 4

0 0

(b)

35

34

33

>35

31

<31

52°15 N

0.1 m s -1

52°N

Rhine

4°E 4° 30 E

Figure 9.5 (a) The Heaps solution applied to the Rhine ROFI. The open circles represent
long-term average current profiles versus height above bed (m), measured by an ADCP
moored close to the seabed. The dashed lines are the prediction of the Heaps solution with
N z ¼ 2.5 10 3 m 2 s 1 . The ADCP was situated at the position marked p in (b). (b) Surface
flow in the Rhine ROFI, measured by HF radar and averaged over 16 days, after Souza et al.,
1997 , courtesy Journal of Marine Research. Dashed lines are salinity isolines. show the

positions of the radar antennae. The position marked ▲ is that of a mooring used to collect the

data shown in Fig. 9.11 .