Effects of non2point source pollution of nitrogen and phosphorus on water quality of the Yuqiao Reservoir
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Abstract:
Yuqiao Reservoir is the unique water source for the water supply of Tianjin City. It. s important to study the effects of the non2point pollution around Yuqiao Reservoir on the water quality in order to improve the water environment and guarantee quality of water supply. Based on the analysis of non2point pollution load, a coupled two2dimensional hydrodynamic and pollutant transport model was developed using the two 2dimensional shallow water and pollutant transport equations. The two 2dimensional model was used to simulate the temporal and spatial distribution characteristics of T N and T P in the reservoir water from June to September in 2008. The simulation results showed that(1)under the effects of inflow of Guo River and dominant wind direc 2 tion in the wet period, T N and TP concentrations diffuse towards the dam site along the south and northwest coastlines, and form the clockwise circumfluence in the east area and the counterclockwise circumfluence in the west area of the reservoir; (2) due to circulation, the water quality in the reservoir center is less affected by the pollution; (3) TP concentration in the east is higher than that in the west of the reservoir, and the average concentration of T P in August is the highest( 1. 56 mg/L); and(4) Liuxiangying and Wubaihu are the main pollution ports of TN, and the average concentration of the T N in September is the highest(3. 74 mg/L).
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