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Land
a
b
1
V, H
b
b
d, l, h
m
b
2
L
km
A
k
a
D
a
b
i
a
Q
i
Land area
b
1
Q
2
d, l, h
b
V, H
b
V, H
b
i
h
i
, l
i
,d
i
Q
3
Q
i
b
2
V
i
q
i
b
N+1
Q
i
E
C
B
FIGURE 6.8
Simple basic descriptions of lagoon shapes.
during the pre-modeling analysis of the lagoon. For example, the Vistula, Curonian,
and Kara Bagaz Gol lagoons may be approximated by the rectangular shapes of types
A and B in Figure 6.8.
Also, when the lagoon has several (
i
1,
N
) entrances (Figure 6.8C), each entrance
can be described in terms of its own width, length, and depth (
d
i
,
l
i
,
h
i
). In such cases,
barrier islands will have lengths (
b
i
). The number
i
corresponding to each lagoon
entrance and barrier island is set to increase in the counter-clockwise direction (as
viewed from the top) in the northern hemisphere and in the clockwise direction in the
southern hemisphere. As such, the influence of the Earth's rotation on the lagoon can
be accounted for irrespective of the hemisphere. The Venice and Mar Menor lagoons
can be represented by lagoons of type C (
see Chapter 9.3 for details).
Other lagoons may feature a network of channels (Figure 6.8D), which become
dry during hot seasons or du
ring
low tidal phases. These lagoons can be represented
by a number of nodes (
=
mM
=
1,
) connected by links. Each link has a length (
L
km
),
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