Surface-to-Air Particle Suspension Formulations: Computed Source Term Release Model, Multimedia Environmental Pollutant Assessment System (MEPAS)
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Preface
Summary
Table of Contents
1.0 Introduction
2.0 Surface-to-Air Particle Suspension Models
3.0 Revised Formulations for Surface-to-Air Mass Flux Models
Summary
The Computed Source Term Release Model of the Multimedia Environmental Pollutant Assessment System (MEPAS) includes formulations for the release of contamination into air and water. This report describes formulations for surface-to-air suspension of particulate material from an area with contaminated surface material. These formulations replace all previously released formulations for the wind suspension rate calculations in the MEPAS Computed Source Term Release Model (Streile et al. 1996. PNNL-11248).
Particle suspension from within a contaminated area from wind and mechanical disturbances is considered. The formulations include particle suspension mechanisms for areas with different levels of wind erosion susceptibility as well as areas with paved and unpaved roadways. The formulations are based mainly on modeling guidance provided by the U.S. Environmental Protection Agency.
The revised formulations apply to the suspension of soil from an area with a contaminated surface soil cover. These formulations include particle suspension models that account for the particle distribution of the suspended materials. The products of these formulations are particle emission rates as a function of particle size ranges as well the total mass loss.
