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University of Guelph (2006)

The emission of PM(10) from supply-limited environments in the Mojave Desert, California

Macpherson, Torin

Titre : The emission of PM(10) from supply-limited environments in the Mojave Desert, California

Auteur : Macpherson, Torin

Université de soutenance : University of Guelph

Grade : Master of Science (MS) 2006

Résumé
Aeolian dust emissions reduce ambient air quality and pose significant health problems for arid and semi-arid regions of the United States. To examine the emission of PM10 (particulate matter < 10 [mu]m) from supply-limited environments, a series of wind tunnel tests were conducted in the Mojave Desert, California. In-situ testing was conducted with an open-floored, portable wind tunnel (12 x 1 x 0.75 m) on a variety of natural soils with both disturbed and undisturbed surface conditions. Results indicate that for supply-limited environments, PM10 emissions are primarily driven by the aerodynamic resuspension of loose surface material as opposed to the dynamic entrainment mechanisms associated with saltating grains. Emission rates were directly influenced by wind shear and mechanical disturbance, and indirectly influenced by soil texture. In addition, disturbance of the surface was found to increase the potential for multiple emission events, which may affect the temporal accumulation atmospheric dust.

Accès au document : Proquest Dissertations & Theses

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