Development of 2-Dimensional Cloud Rise Model to Analyze Initial Nuclear Cloud Rise

The objective of this research is to create a two-dimensional cloud rise model that could be used instead of the current 1-D cloud rise model in the Defense Land Fallout Interpretive Code (DELFIC) option of the Hazard Prediction and Assessment Capability (HPAC). The model includes numerical analysis of partial differential equations involving pressure, potential temperature, horizontal and vertical winds, and specific humidity. The 2-D model developed provides a much more detailed definition of the physical properties within the mushroom cloud than the 1-D DELFIC option. This is particularly useful in fallout studies on particle formation, fractionation, and particle location within the rising/risen cloud.