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《Journal of Hydroelectric Engineering》 2012-04
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Estimation of non-point source pollution characteristics and loading in Xi'an urban areas

LI Jiake1,LI Huai-en1,DONG Wen1,LI Yajiao2,SHEN Bing1,QIN Gaowei1(1 Key Lab of Northwest Water Resource and Environment Ecology of MOE, Xi'an University of Technology,Xi'an 710048;2.School of Architecture and Civil Engineering, Xi'an University of Science and Technology,Xi'an 710054)  
River water quality is heavily impacted by urban non-point source pollution(NSP) and study of characteristics and loading of urban NSP is crucial to water quality control.We monitored the water quality at different runoff plots in the main urban areas of Xi'an city in 2010 and 2011,and calculated the NSP loadings of the same areas for 2010(normal year).The results indicate that NSP concentrations were the highest in the initial 20 minutes of each surface runoff process and they were decreasing as rainfall continued.The variations of NSP concentration are the smallest in traffic zones and the greatest in residential zones.In traffic zones,mean concentrations of suspended solid(SS),chemical oxygen demand(COD) and heavy metal were the highest,while in business zones,mean concentrations of ammonia nitrogen(NH3-N),total nitrogen(TN) and total phosphorus(TP) were the highest.Second,the estimations by concentration method and method of monitored rainfall proportion in total rainfall,agree well with each other,indicating that these methods are reliable and applicable to urban NSP loading.In estimating this loading,we found two good methods that verify each other,one summing up each functional zone' loadings calculated using mean concentration and surface runoff,the other using a comprehensive mean concentration and total surface runoff of the city for direct calculation.Third,calculations of the main urban areas in 2010 show that the NSP loadings of SS,COD,NH3-N,TN,TP,Cu,Zn,Pb,Cd and Cr were 12958.5 tons,3444.2 tons,141.9 tons,231.4 tons,7.5 tons,0.94 tons,4.3 tons,2.2 tons,1.1 tons and 1.4 tons,respectively.Pollutant export coefficients of traffic zones were the highest,and the ones of green lands the lowest.
【Fund】: 国家自然科学基金资助项目(50909080);; 国家水体污染控制与治理科技重大专项(2008ZX07317-004-001);; 中国博士后科学基金(20100481353);; 陕西省教育厅计划项目(11JK0753)
【CateGory Index】: X501
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