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Time-Varying PM10 Emissions from Open-Lot Dairies and Cattle Feedyards

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  International Symposium on Air Quality and Manure Management for Agriculture Conference Proceedings, 13-16 September 2010, Dallas, Texas  711P0510cd.(doi:10.13031/2013.32652)
Authors:   Brent W Auvermann, Jack Bush, Gary Marek, Kevin Heflin, Brad Wilhite, Sharon L. P Sakirkin
Keywords:   Feedyard, feedlot, open-lot dairy, fugitive emissions, PM10, dust, AERMOD, dispersion modeling, time-varying

Typical PM emission-factor studies for dairies and feedyards have involved measuring ground-level concentration as close to the plume centerline as weather predictions permit, followed by dispersion modeling using a single-valued emission factor to match the 24-hour average concentration. Using AERMOD as our dispersion-modeling platform, we confirm that the 24-hour average emission factor cannot reproduce the hourly average concentrations throughout the day and vastly underpredicts the magnitude of the evening dust peak. Moreover, matching a single concentration measurement near the plume centerline is not as rigorous a dispersion-modeling test as attempting to match an entire transverse cross-section of the plume along the downwind boundary.

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