Environmental Engineering Reference
In-Depth Information
Chemical release
Receptor
Transport/
Transformation
Contaminated
sediment
Risk
Risk-based paradigm
FIGURE 6.55
RBCA paradigm.
transport, where the dispersivity is replaced by molecular diffusion. The geometry
considered for modeling is shown in Figure 6.57.
erf
z
,
[
A
]
w
w
=
4
D
s
t
(6.212)
[
A
]
4
/
3
ε + ρ
p
K
sw
D
w
ε
where
D
s
=
.
The release rate (flux) is
D
s
π
1
/
2
W
A
ρ
p
,
F
A
=
(6.213)
t
where
W
A
is the initial sediment contamination.
Air
Evaporation
Suspended
sediment
Water
Deposition
“Mobile” bed
6
7
8
“Mud flats”
1
5
2
Dune
2
3
2
9
11
9
10
Wor ms
Bed sediment
Bed sediment
4
Groundwater
Bedrock
FIGURE 6.56
Schematic of the fate and transport processes in bed sediments.
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