82
1. De Vries et al.
west
east
b)
E 0
.5
.c
5
....
Cl.

"0
15
10
a) siphon sluice
b) sluice
40
11
Fig.3.1a,b. Lake Grevelingen. a Map with horizontal boundaries of model segments. b
Model segments in vertical direction
prevent salinity stratification. The restricted flushing with sea water has
reduced the flushing time, or water residence time, of the lake to its
present value (Table 3.1). The bathymetry of the lake with large shallow
areas and several deep gullies still reflects its estuarine origin. Approximately 60% of the area has a depth of less than 2.5 m.
The freshwater input from polders is very small compared to the lake
volume, and to the other lagoons. As a consequence of the almost