C. SUN, H. J. WU
Copyright © 2012 SciRes. JWARP
Table 5. Water environmental capacity in the Xiangyang
Reach of the Han River.
Computational unit COD (t/a) NH3-N (t/a)
Shenwan-Xianrendu 3614.1 576.34
Xianrendu-Baijiawan 1904.4 177.11
Zhakou-Qianying 44986.2 2278.76
Qianying-Yujiahu 3570.1 224.13
Yujiahu-Guo’an 9852.23 197.46
Table 6. Water environmental capacity in the Xiangyang
Reach after the implementation of the Cuijiaying project.
Computational unit COD (t/a) NH3-N (t/a)
Shenwan-Xianrendu 3728.3 592.51
Xianrendu-Baijiawan 1905.5 177.6
Zhakou-Qianying 42661.3 2112.2
Qianying-Yujiahu 3612.3 235.1
Yujiahu-Guo’an 10007.6 203.78
period, and it is appearing to increase slightly in the up-
per and lower stream (Shenwan-Baijiawan, Qianying-
Guo’an) of this project.
Applying two-dimensional steady state water quality
model, we estimated the water environmental capacity of
the Xiangyang Reach. Owing to the influence of cascade
development, there is a decline of water environmental
capacity in the reservoir region, also a growth in the up-
per and lower stream of the dam. However, the flow rate
has declined in the reservoir area, and what should be
done is to look for the influence of the cascade develop-
ment on the aquatic eco-environment. The reservoir area
should be a priority region for pollution control. The case
study of the Xiangyang Reach shows that municipal do-
mestic sewage was one of the major point source pollu-
tion, which contributed the most COD load entering the
Han River in 2007. Improvement of sewage treatment
facilities should be considered by policy makers in this
This study was supported by the Environmental Protec-
tion S&T Program of Hubei Province. The authors thank
the Hubei Provincial Environmental Protection Depart-
ment and Xiangyang Environmental Protection Agency
for providing necessary data.
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