Determination of odor emission rates from cattle feedlots using CALPUFF and ISCST3 models Conference Paper uri icon


  • CALPUFF model and ISCST3 Gaussian dispersion models were evaluated for odor modeling in predicting downwind concentrations and back-calculating area source odor emission rates. The comparison between predicted downwind concentrations and field-sampled downwind concentration measurements indicated that CALPUFF could fairly well predict average odor downwind concentrations. However, ISCST3 tended to predict concentrations less than the measured concentrations. Both CALPUFF and ISCST3 models failed to predict peak odor concentrations using constant average emission rate. Odor emission rates obtained by backcalculating fluxes using CALPUFF and ISC models with the same field measurements of downwind odor concentrations are significantly different. It indicates that back-calculated emission rates are not exchangeable for different models. The modeled emission rates tended to be higher than flux chamber source sampling results. The flux chamber protocol may under-estimate odor emission rates.

published proceedings

  • 2005 ASAE Annual International Meeting

author list (cited authors)

  • Wang, L., Parnell, C. B., Parker, D. B., Lacey, R. E., & Shaw, B. W.

complete list of authors

  • Wang, L||Parnell, CB||Parker, DB||Lacey, RE||Shaw, BW

publication date

  • December 2005