Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Spatial Characteristics of Grain Size Distribution of Street Dust in Lanzhou and Its Environmental Significance

Wang Guan1,Xia Dunsheng1,2,Chen Fahu1,Liu Xiuming1,Yang Liping1(1.Key Laboratory of the West Environmental System,Lanzhou University,Lanzhou 730000,China; 2.Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and EngineeringResearch Institute,Chinese Academy of Sciences,Lanzhou 730000,China)  
Street dust samples collected on March 30th,2006 in Lanzhou were analyzed by Laser Grainsize Analyzer.Results of the grain size distribution show that mean grain size vary from 46.83 to 266.587 μm with mean value of 118.73 μm.Particles with grain size more than 2 μm occupied 92%~99.5%,while particles less than 2 μm accounted for less than 10%.Controlled by landform,grain size in west and east part of Lanzhou are coarser than other areas.Coarse material is dominant in areas controlled by strong wind.The content of coarse particles and fine particles are similar in areas with relatively weak wind.In areas with very weak wind fine,particles are the main content of the street dust.The results indicate that major sources of street dust in Lanzhou are soil dust brought by strong wind and human activities.The characteristics of grain size distribution were controlled by wind power and material sources(pollution sources).
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved