调水及梯级开发对汉江襄阳段水环境容量影响
Effect of Water Diversion and Cascade Development on Water Environmental Capacity of the Hanjiang River in Xiangyang
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摘要: 汉江是襄阳市主城区唯一水源地和纳污水体,其水质状况对襄阳市和汉江中下游的社会经济发展和人民生活影响重大。对南水北调中线调水及汉江梯级崔家营建成后的汉江襄阳段环境容量进行了预测,为该区域的水污染物总量控制提供科学依据。结合汉江襄阳段的水质、水文条件以及排污状况,采用零维和二维水质模型相结合,对该江段的水环境容量进行了计算。结果表明:与现状相比,2015年汉江襄阳段主要污染物COD和NH3-N的水环境容量在多数江段呈下降的趋势,尤其是丰水期和平水期下降较为明显。Abstract: As the only water source and receiving water of the Xiangyang downtown, water quality of the Hanjiang River is very important to economic and social development in the middle and lower reaches. This paper evaluated the changes of water environmental capacity in Xiangyang city after the implementation of the South-to-north water diversion and cascade development and supplied scientific evidence for total amount control of water pollutants. Based on the specified water quality, hydrological patterns and pollution sources of the Hanjiang River in Xiangyang city, water environmental capacity was calculated by the application of zero and two dimensional water quality model. The results indicate that compared with present condition, in 2015, the water environmental capacity of the main pollutants (COD and NH3-N) will decline in most reaches of the Xiangyang City, especially during the high and middle-flow period.
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