Study on Evaluation Index System Establishment and Health Assessment of Qijiang River
Abstract: The study of river health assessment plays an important role in the management and protection of river environment. In this paper, a comprehensive evaluation method based on analytic hierarchy process (AHP) was used to study the health assessment of Qijiang River in Chongqing, the first-grade tributary of the Yangtze River. The weight of evaluation index and the characteristic value of the index standard had been determined. Meanwhile, 13 indicators from hydrology-water resources, water environment, aquatic condi-tions and social service functions had been used to characterize the health of the river. The results showed that the water body of Qijiang was basically in a state of health. In the 13 evaluation indexes, the ecological flow satisfaction degree, the river connectivity barrier status, the pollution index performance index, the index of the integrity of the benthic animal and the integrity index of the fish were relatively low. Mean-while, due to the construction of the Qijiang Shang Shui, blocking the route of migratory fish, fragmentation phenomenon appears in the river fish ecology system and large bottom dwelling animals’ complete index is also affected. Most of the water conservancy projects also should set ecological water drainage facilities; the middle pollution and human interference are slightly worse; emissions of COD and ammonia nitrogen are larger, which all need to further strengthen management.
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