Yu Jie, Li Huai-En
Department of Environmental Engineering, Xi'an University of Technology, Xi'an 710048, China.
Huan Jing Ke Xue. 2013 May;34(5):1700-6.
Based on the water quality inspection results of Weihe River in the Xi'an section and the runoff at the watershed in different representative years, it was found through the pollution load calculated from the mean concentration method that Weihe River's main stream was dominated by point source pollution and non-point source pollution was more serious in tributaries. The input amount of pollutant to Weihe River' main stream from Xi'an which is located within the Xianyang and Lintong section was calculated from the material balance algorithm based on the pollutant concentrations measured in 2009 and 2011. The percentage of the pollution load of Xi'an area on Lower reaches' monitoring section of Lintong was analysed and the impact of Xi'an area on the water quality of Weihe River was quantified. The computational results showed that the upstream of the Xianyang section was the main source of the pollution load of the Lintong section in Weihe River, followed by Xi'an area. More than 40% of TN, COD and NH4+ -N of the Lintong section came from the upstream of the Xianyang section and more than 30% came from Xi'an area, in addition, 53% of TP came from Xi'an area. The non-point source pollution in Xi'an was more serious than in its upstream and downstream areas while point source pollution load accounted for 63% of the total.
根据渭河西安段水质检测结果及流域不同代表年径流量，采用平均浓度法计算污染负荷发现，渭河干流以点源污染为主，支流非点源污染更为严重。基于2009年和2011年实测污染物浓度，运用物料平衡算法计算了位于咸阳和临潼段内西安对渭河干流的污染物输入量。分析了西安地区污染负荷在临潼下游监测断面的占比，量化了西安地区对渭河水水质的影响。计算结果表明，咸阳段上游是渭河临潼段污染负荷的主要来源，其次是西安地区。临潼断面40%以上的总氮、化学需氧量和氨氮来自咸阳段上游，30%以上来自西安地区，此外，53%的总磷来自西安地区。西安的非点源污染比其上下游地区更为严重，而点源污染负荷占总量的63%。
