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《Research of Environmental Sciences》 2009-02
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Load of Non-Point Source Pollutants from Upstream Rivers into Three Gorges Reservoir

ZHENG Bing-hui~(1,2),WANG Li-jing~(1,2),GONG Bin~21.College of Water Sciences,Beijing Normal University,Beijing 100875,China2.River and Coastal Environment Research Center,Chinese Research Academy of Environmental Sciences,Beijing 100012,China  
Hydrological segmentation provides an effective approach for quantifying non-point source(NPS) pollutant load.Using this concept,a calculation formula for NPS load was established based on the segmentation of base flow.Combined with correlation and regression analyses,principles for identifying pollutant flux type and interpolating data were proposed,and the method was further improved.The NPS load from upstream rivers into the Three Gorges reservoir was studied using water quality and hydrological data from 2004 and 2005.Furthermore,a correlative coefficient method was used to compare and explore the structural error caused by the hydrological segmentation method.The results,expressed as total pollutant flux of dissolved pollutants and particles,showed that the NPS loads of COD_(Mn),TN and TP from Jialing River,Yangtze River and Wu River in 2004 were 168.96×10~4,70.30×10~4 and 10.95×10~4 t,respectively,and in 2005 were 228.24×10~4,66.64×10~4 and 14.24×10~4 t,respectively.Compared with point sources,NPS pollutants accounted for 60%-80% of total influx load.Regarding the spatial distribution,the Yangtze River had a dominant proportion while the Jialing and Wu Rivers only had 13.4% to 39.4%.As for the nutrient composition,the effect of nitrogen on the water was mainly through dissolved nitrogen.However,the effect of phosphorus was largely through particles.The results suggested that,although the hydrological segmentation method should be improved,at present the current hydrological segmentation method is still effective.
【Fund】: 科学技术部中德国际合作项目(2007DFA90510)
【CateGory Index】: X143
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