Chemical and Water Quality Kinetic Characteristics and Processes - Hydro-Environmental Analysis: Freshwater Environments - page 388

32.4
31.6
30.9
30.1
29.3
28.6
27.8
27.1
26.3
25.5
24.8
24.0
23.3
22.5
21.7
21.0
20.2
19.4
18.7
17.9
17.2
16.4
15.6
14.9
14.1
13.4
12.6
11.8
11.1
10.3
9.55
8.79
8.03
7.27
6.51
5.74

Te mperature at 07/31/1995 23:13

Distance (m)

100,000 80,000 60,000 40,000 20,000 0

0 0

5 5

10 10

15 15

20 20

25 25

30 30

100,000 80,000 60,000 40,000 20,000 0

Distance (m)

(a) Walter F. George Reservoir, GA, predicted water temperatures (°C) for July 31, 1995

160.0
156.0
151.0
147.0
143.0
138.0
134.0
129.0
125.0
120.0
116.0
112.0
107.0
103.0
98.4
94.0
89.6
85.2
80.8
76.4
71.9
67.5
63.1
58.7
54.3
49.9
45.5
41.1
36.7
32.2
27.8
23.4
19.0
14.6
10.2
5.79

Water_age at 07/31/1995 23:13

Distance (m)

100,000 80,000 60,000 40,000 20,000 0

0 0

5 5

10 10

15 15

20 20

25 25

30 30

100,000 80,000 60,000 40,000 20,000 0

Distance (m)
(b) Walter F. George Reservoir, GA, predicted water age (days), July 31, 1995 (from 1 January)

FIGURE 14.18 (a,b) Predicted water temperature (°C) and water age (days from January 1) in Lake Walter
F. George, Georgia, 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.)

14.5.1.2 Ammoniication
The decomposition of organic forms of nitrogen (organic nitrogen) leads to the release of ammonia,
a process referred to as ammoniication (Figure 14.22; Equation 14.10):

Protein(organic-N) bacteria + → 3 NH

(14.10)

Ammoniication occurs under either oxic or anoxic conditions. In the photic zone, ammonia may
be taken up by plants as an essential nutrient, or it may be produced via excretion. In the aphotic
zone, ammoniication can result in accumulations of oxygen during periods of stratiication.