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is impossible. Therefore, block MHMT describes the processes which have
estimates. The transport of heavy metals in the sea water includes absorption of the
dissolved fraction
by plankton H
Z
and by nekton H
F
, sedimentation of the
solid fraction H
1
, deposition with the detritus H
D
, adsorption by detritophages
from bottom sediments H
e
L
, and release from bottom sediments owing to dif-
fusion H
e
w
ˈ
a
. As a result, the dynamic equations for the heavy metals become:
@
z
¼
X
3
i¼1
a
@
e
W
u
@
e
W
@u;
@
e
W
k
þ
v
z
@
e
W
@
t
þ
v
W
þ
v
W
k
i
2
Q
i
e
W
H
1
þ a
1
H
e
W
ð
6
:
11
Þ
a
@w
W
@
u
@w
W
k
þ
@w
W
þ
v
z
@w
W
þ
k
2
@
2
w
W
t
þ
v
W
þ
v
W
z
þ
v
W
Þ
H
e
w
a
u
¼ 1
a
1
ð
@u
@k
@
z
2
H
Z
H
F
H
D
H
a
ð
6
@
:
12
Þ
@
e
@
t
¼ H
1
a
1
H
e
L
þ
H
e
w
ð
6
:
13
Þ
a
@w
t
¼ H
D
ð
1
a
1
Þð
H
e
L
þ
H
e
w
Þ
ð
6
:
14
Þ
a
@
*
are the concentrations of heavy metals in the water and in
the bottom sediments as solid and dissolved phases, respectively; H
a
is the output
of heavy metals from the sea to the atmosphere by evaporation and spray; Q
i
e
w
ˈ
w
and e
*
,
where e
w
,
ˈ
is the
input of heavy metals to the sea with river waters (i = 1), atmospheric deposition
(i = 2) and ship
i
2
'
is wastes (i =3);
a
is the part of the suspended particles in the i-th
fl
flow of heavy metals; and
a
1
is the part of the solid fraction of heavy metals in the
bottom sediments.
Each radionuclide of
s
e
, the rate H
1
of
ʵ
-th type is characterized by the half-life
, the accumulation rate H
a
input
fl
ow to the water area
Ω
in the living organisms
ð Þ
and the removal rate H
e
D
with the dead elements of the ecosystem.
As a result, the concentration Q
e
of the radionuclide
a
p
A
;
B
A
;
Z
;
F
;
L
ʵ
in
X
ijk
is described by the
following system of equations:
Q
e
@
Q
e
@u
Q
e
@k
Q
e
@
2
Q
e
@
@
u
@
@
þ
v
z
@
z
¼
r
ijk
H
1
þ
k
2
@
t
þ
v
W
þ
v
W
k
z
2
H
a
r
ð
6
:
15
Þ
In2
s
e
H
e
D
Q
e
þ
H
e
;
Q
e
@
@
ln 2
s
e
t
¼ H
e
D
H
e
Q
e
ð
6
:
16
Þ
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