Environmental Engineering Reference
In-Depth Information
105.0
102.0
98.8
95.9
93.0
90.2
87.3
84.4
81.5
78.6
75.8
72.9
70.0
67.1
64.2
61.4
58.5
55.6
52.7
49.9
47.0
44.1
41.2
38.3
35.5
32.6
29.7
26.8
23.9
21.1
18.2
15.3
12.4
9.54
6.66
3.78
Chlorophyll-a at 07/31/1995 23:02
Distance (m)
30,000
20,000
10,000
0
0
0
5
5
10
10
15
15
20
20
25
25
30
30
35
35
40
40
45
45
30,000
20,000
10,000
0
Distance (m)
(a)
Allatoona Reservoir, GA, predicted chlorophyll-a concentrations (µg L
-1
) for July 31, 1995
13.4
13.1
12.7
12.3
11.9
11.6
11.2
10.8
10.5
10.1
9.73
9.36
8.99
8.62
8.25
7.88
7.51
7.14
6.77
6.40
6.03
5.66
5.29
4.92
4.55
4.18
3.81
3.44
3.07
2.70
2.33
1.96
1.59
1.23
0.855
0.485
Dissolved_oxygen at 07/31/1995 23:02
Distance (m)
30,000
20,000
10,000
0
0
0
5
5
10
10
15
15
20
20
25
25
30
30
35
35
40
40
45
45
30,000
20,000
10,000
0
Distance (m)
(b)
Allatoona Reservoir, GA, predicted dissolved oxygen concentrations (mg L
-1
) for July 31, 1995
FIGURE 14.21
(a,b) Predicted chlorophyll-a (ppb, μg L
-1
) and dissolved oxygen concentrations (ppm,
mg L
-1
) for Lake Allatoona, GA, for July 31, 1995. (From Martin, J.L. and Hesterlee, C., Detailed reservoir
water quality modeling to support environmental impact statements for the evaluation of ACT and ACF river
basins water allocation, Contract Report prepared for the U.S. Army Engineer District, Mobile, 1988.)
etry from Equation 14.13, for each gram of nitrogen nitrified, 4.57 g of oxygen would be
consumed.
(
)
2
molO gO /molO
molN gN/mol N
32
gO
gN
2
2
2
2
(14.14)
R
nitrif
=
=
457
.
(
)
1
14
So, nitriication has a large impact on oxygen concentrations.
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