北京地区场次降雨氮、磷湿沉降特征  

Characteristics of Nitrogen and Phosphorus Wet Deposition in Rainfall Events in Beijing

作　　者：陈艾婷 王培京 于妍[1] 战楠 于磊 王鑫 马宁 孟庆义 李其军 CHEN Ai-ting;WANG Pei-jing;YU Yan;ZHAN Nan;YU Lei;WANG Xin;MA Ning;MENG Qing-yi;LI Qi-jun(School of Chemical&Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Beijing Key Laboratory of Water Environmental and Ecological Technology for River Basins,Beijing Water Science and Technology Institute,Beijing 100048,China;Beijing Administration Office of Miyun Reservoir,Beijing 101512,China)

机构地区：[1]中国矿业大学<北京>化学与环境工程学院,北京100083 [2]北京市水科学技术研究院流域水环境与生态技术北京市重点实验室,北京100048 [3]北京市密云水库管理处,北京101512

出　　处：《中国给水排水》2022年第13期132-138,共7页China Water & Wastewater

基　　金：北京市财政项目。

摘　　要：针对大气湿沉降会对城市水环境造成污染的现状,在北京地区设置了5个大气湿沉降采样点:莲石湖公园(A)、沙河闸(B)、北关闸(C)、怀柔水库(D)、密云水库(E),在2020年汛期进行了4个月的监测。根据监测数据,以降雨量超过20 mm的场次降雨为研究对象,分析TN、NH_(4)^(+)-N、NO_(3)^(-)-N和TP浓度及其变化规律。结果表明,暴雨的氮组分浓度要高于大雨的氮组分浓度;各指标的沉降通量与降雨量均呈正相关,R^(2)分别为0.9236、0.9167、0.5917、0.8441。在空间上,5个站点场次降雨的TN平均浓度分别为5.39、4.70、3.86、3.35、3.18 mg/L,表现为A>B>C>D>E,并且降雨中NO_(3)^(-)-N占无机氮的比例亦为A>B>C>D>E,表现出城区污染比远郊区污染严重的规律。5个站点的暴雨等级降雨过程中,TN、NH_(4)^(+)-N和NO_(3)^(-)-N浓度总体呈下降趋势。与前一小时降雨中的氮浓度相比,当后一小时降雨量达到5 mm以上时,氮浓度通常会下降;当后一小时降雨量不足2 mm时,氮浓度多数会上升,上升幅度最高达到63%。To identify the effect of atmospheric wet deposition on urban water environment,five atmospheric wet deposition sampling sites were set up in Beijing:Lianshi Lake Park(A),Shahe Gate(B),Beiguan Gate(C),Huairou Reservoir(D)and Miyun Reservoir(E),and monitored for four months during the wet season in 2020.Based on the monitoring data,the concentrations of TN,NH_(4)^(+)-N,NO_(3)^(-)-N and TP and their variation law in rainfall with intensity more than 20 mm were analyzed.The concentration of nitrogen in hard rain was higher than that in heavy rain.The atmospheric wet deposition flux of each index was positively correlated with rainfall,and R2 was 0.9236,0.9167,0.5917 and 0.8441,respectively.In terms of spatial distribution,the TN average concentration in rainfall events at five stations were 5.39 mg/L,4.70 mg/L,3.86 mg/L,3.35 mg/L and 3.18 mg/L,respectively,and its descending order was A,B,C,D and E.In addition,the proportion of NO_(3)^(-)-N to inorganic nitrogen in rainfall had a descending order of A,B,C,D and E,indicating that the pollution in urban area was more serious than that in suburban area.The concentrations of TN,NH_(4)^(+)-N and NO_(3)^(-)-N in rainfall events at the five stations showed a decreasing trend during the process of a rainstorm.Compared with the nitrogen concentration in the previous hour,nitrogen concentration usually decreased when the rainfall in the next hour was more than 5 mm.However,nitrogen concentration mostly increased when the rainfall was less than 2 mm in the next hour,and the increase was as high as 63%.

关 键 词：场次降雨 氮 磷 湿沉降 

分 类 号：TU992[建筑科学—市政工程]