An Assessment of Urban River Ecosystem Health Based on Fuzzy Pattern Recognition

This paper establishes a health assessment index system of urban river ecosystem by considering water quantity and quality,riparian,aquatic biological and river physical structure reflecting the urban river ecosystem.The fuzzy pattern recognition model is applied to the urban river ecosystem health assessment and AHP is used to determine the index weights.Based on the choice principle of assessment index,this paper chooses eight assessment indexes and advances five grade assessment standards.The ecosystem health of the Hunhe River in Shenyang is assessed in 2009.The result shows that the Hunhe River in Shenyang belongs to the second standard(unhealthy).Compared with the actual condition,the result is reasonable.The main reasons for the river's poor health are over-exploitation of water resources and sewage disposal.