QUANTIFYING THE ENVIRONMENTAL IMPACT OF PARTICULATE DEPOSITION FROM DRY UNPAVED ROADWAYS

Airborne dust is the air pollutant most frequently observed to exceed National Ambient Air Quality Standards in rural areas. This pollutant (also referred to as suspended particulates) may originate from point sources (e.g., large areas of bare soil or pollen-producing vegetation.) Most sources of atmospheric particulates, whether natural or anthropogenic, are difficult to quantify by means of a source strength (i.e., mass of particulates emitted per unit time). A numerical model was developed for calculating the source strength and quantifying the atmospheric transport and eposition of dust generated on unpaved roadways. This model satisfies the second-order differential equation for the diffusion process and also the equation of mass conservation. Input to the model includes meterological variables, surface roughness characteristics, and the size distribution and suspended particulate concentration of dust as sampled downwind of an unpaved roadway. By using predetermined tolerance levels of airborne concentrations or tolerance levels of deposition, maximum allowable vehicular traffic volume can be established. The model also may be used to estimate reduction in photosynthesis resulting from fugitive dust from point or line sources. The contributing ion to sedimentation in aquatic bodies, resulting from airborne particulates also may be assessed with this model.

  • Corporate Authors:

    Iowa State University, Ames

    Ames Laboratory
    Ames, IA  United States  50011

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Becker, D L
  • Publication Date: 1979-1

Media Info

  • Pagination: 149 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00191911
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Thesis
  • Contract Numbers: W-7405-ENG-82
  • Files: TRIS
  • Created Date: Jul 11 1979 12:00AM