8.5 Diffusion and Mixing in Estuaries
..c:
- A
0
'"0
'-'
* ~
~
d
.g
CIl
d
0
S
:.a I
r::
0
Z
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1.0
-0.1
solution for large
river discharge
0.0
solution for small
river discharge
0.1
295
0.2
Non-dimensional salinity deviation
Fig. 8.17: Vertical distribution of the normalized salinity deviation in partly mixed
estuary
Assuming that mean salinity is equal to So, we have for the integration constant C:
(
u2 05)-1
C =50 - -
Kz ax
1
12
Thus, the final salinity distribution becomes:
in which:
[ 1 1(z)2 3(Z)4 2(Z)5]
h(z)= -12+2 h -4" h -5 h .
(8.114)
(8.115)
(8.116)
Let us examine the salinity when the river flow is dominant. From Eq. (8.109)
for the corresponding mean velocity and velocity deviation we have:
ii. = Uo,
(8.117)