摘要
道路扬尘是城市大气颗粒物主要来源之一,本研究采用降尘法监测北京道路扬尘并分析降尘排放特征。对北京不同类型道路共40条,每条道路布置2个降尘监测点,并对背景降尘值进行了监测,道路降尘（DFr）与背景降尘（DFb）的差值作为道路自身降尘（ΔDF）。结果显示,快速路、主干道、次干道和支路的ΔDF分别为18.9、13.9、9.9和9.7 t/（km2.30 d）,降尘值比例为100∶74∶52∶51,单辆车引起的降尘比例为1.00∶2.55∶5.20∶5.67;夏季道路降尘量最大,其次为冬季。以一年为周期,道路月均降尘为ΔDF,则1~4月份交通降尘量为0.72~0.94ΔDF,5~8月份降尘量为1.10~1.30ΔDF,9~12月份月降尘量为0.96~0.99ΔDF;不同类型道路ΔDF数据均呈偏态分布,道路降尘不同季节也均为偏态分布。道路降尘量与车流量呈正线性相关。
Road fugitive dust（RFD） is one of the main sources of air particulate matter in metropolitan area.Eighty road dust-fall（DF） monitoring sites and 14 background monitoring sites were established in the Beijing metropolitan area,and monitoring was conducted from January to December 2007.The difference of road dust fall（DFr） and background dust fall（DFb） was defined as dust fall increment（ΔDF）.The results indicated that ΔDF of freeway,major arterial,minor arterial and collector were 18.9,13.9,9.9 and 9.7 t/（km2·30 d）,respectively,the ratio was 100∶74∶52∶51,and ratio of ΔDF caused by single motorcar was 1.00∶2.55∶5.20∶5.67.If defined that the annual average value of ΔDF was ΔDF,ΔDF from January to April,from May to August,and from September to December were 0.72~0.94ΔDF,1.10~1.30ΔDF,and 0.96~0.99ΔDF,respectively.ΔDF of different types of roads show positively skew distribution,and ΔDF in different seasons show positively skew distribution too.DFr was positively correlated with traffic volume.
出处
《环境工程学报》
CAS
CSCD
北大核心
2010年第3期629-632,共4页
Chinese Journal of Environmental Engineering
基金
国家环保公益性行业科研专项(200709030)
关键词
道路扬尘
降尘
颗粒物
排放特征
road fugitive dust
dust fall
particulate matter
emission characteristics
