MESODIF-II: A Variable Trajectory Plume Segment Model to Assess Ground-Level Air Concentrations and Deposition of Routine Effluent Releases from Nuclear Power Facilities.

摘要

MESODIF-II is a variable trajectory plume segment atmospheric transport model designed to predict normalized air concentrations and deposition of radioactive,but otherwise non-reactive,effluents emanating from one or two levels over the same position in a xy-plane. In such a model,calculated particle trajectories vary as synoptic scale wind varies. At all sampling times the particles are connected to form a segmented plume centerline,enclosed by a plume the lateral and vertical dimensions of which are determined by a parameterization of turbulence scale diffusion. The impetus for the development of this model arose from the need of the U. S. Nuclear Regulatory Commission to assess radiological effects resulting from routine nuclear power reactor operations,as outlined in U. S. Nuclear Regulatory Guide 1.111.