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Fig. 9.21 Tide characteristics of Dam Nuoc Ngot Lagoon. Notation t
hwl
(h
hwl
) is the time (level)
when absolute high water level is realized; t
shw
(h
shw
) is the time (level) when small high water is
realized; t
lhw
(h
lhw
) is the time (level) when low high water takes place; t
lsw
(h
lsw
) is the time (level)
when low small water takes place; B is the great tide level; A
0
is the mean tide level
Table 9.18 Effectiveness of the ESECEZ system to forecast water salinity in Nuoc Ngot Lagoon
Controlling
sites
Measured water
salinity (
o
/
oo
)(t
0
)
Forecast and error (%)
t
0
+ week
t
0
+ two
weeks
t
0
+ three
weeks
t
0
+ month
t
0
+
ve
weeks
1
30.2
32.0(5)
32.8(9)
26.4(10)
29.3(12)
34.4(14)
2
33.6
32.8(2)
34.4(10)
27.6(15)
26.4(19)
25.7(23)
3
33.6
32.4(5)
33.7(12)
37.5(17)
25.9(19)
26.2(22)
4
33.7
33.4(4)
28.3(12)
37.8(17)
26.6(20)
25.6(24)
5
33.8
33.4(4)
28.8(11)
27.6(17)
25.2(20)
26.5(22)
6
33.8
31.0(8)
30.9(12)
27.8(17)
27.5(20)
25.3(25)
7
30.7
31.4(3)
34.9(13)
27.9(17)
30.2(9)
34.5(19)
8
32.4
34.7(7)
30.9(9)
34.9(16)
26.6(19)
25.2(22)
9
32.5
33.0(6)
29.4(10)
28.6(18)
28.3(20)
25.1(23)
10
30.4
31.9(9)
33.2(12)
34.5(17)
33.2(10)
27.8(24)
depth. However, the water salinity in the river mouths
fl
flowed to the lagoon is
sharply reduced with increase of its depth.
Table
9.20
gives some details about the precision of the ESECEZ system under
the reconstruction of other characteristics in Nuoc Ngot Lagoon. The big discrep-
ancy of the experimental and the simulated data is observed in the control sites 3
and 7 when PO
3
4
is assessed. Evidently, the main cause of this discrepancy lies in
that washout processes for chemical elements from the bottom sediments are not
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