Improved Atmospheric Dispersion Models for Space Shuttle Launches at Vandenberg AFB,
CRAMER (H E) CO INC SALT LAKE CITY UT
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To assist in evaluating the environmental effects of material injected into the lower atmosphere during launches of the Space Transportation System STS at Vandenberg VAFB, the U. S. Air Force USAF is implementing an improved and modified version of the REEDM computer code currently used to support STS launches at Kennedy Space Center KSC. This paper describes the basic features of the REEDM program and outlines in detail the modifications and improvements being made to adapt this program for STS launches at VAFB. The modificationsimprovements include a new model for predicting the fallout and surface deposition of acidic particles for use at both KSC and VAFB development of turbulent dispersion coefficients appropriate for VAFB incorporation of a mesoscale wind-field model for calculating the effects of the complex terrain at VAFB on the trajectories and dispersion of the STS exhaust clouds. An additional important task is the performance of an extensive environmental risk assessment for VAFB using VAFB rawinsonde data with the modified REEDM computer program.