8B.3
Modeling atmospheric deposition from a Cesium release in Spain using a stochastic transport model
Robert L. Buckley, Savannah River Technology Center, Aiken, SC
An advanced stochastic transport model has been modified to include the removal mechanisms of dry and wet deposition. Time-dependent wind and turbulence fields are generated with a prognostic mesoscale numerical model and are used to advect and disperse individually released particles that are each assigned a mass. These particles are subjected to mass reduction in two ways depending on their physical location. Particles near the surface experience a decrease in mass using the concept of a constant dry deposition velocity, while the mass of particles located within areas of precipitation are depleted using a constant scavenging coefficient. Instantaneous and cumulative dry and wet deposition are determined from the mass loss due to these physical mechanisms. A useful means of validating the model results is with data available from a recent accidental release of Cesium-137 from a steel processing furnace in Algeciras, Spain in May, 1998. This paper describes the deposition modeling technique, as well as a comparison of simulated deposition with measurements taken for the Algeciras release.
Session 8B, Deposition Modeling (Parallel with Session 8A)
Tuesday, 11 January 2000, 4:00 PM-5:45 PM
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