Gust factor variations with height and atmospheric stability

Abstract

Data collected from wind instrumentation installed on a 152‐meter meteorological tower located on White Sands Missile Range, New Mexico, are analyzed to determine gustiness characteristics during both unstable and very stable regimes. The following results are indicated: an increase in gust factors occurs as the air‐mass instability becomes greater and as the mean wind‐speed time averaging period is enlarged; however a decrease in gust factors is associated with an increase in height and wind speed and with the extension of the peak wind‐speed averaging interval. Also, estimates of gust factors to a height of 152 meters are obtained for different averaging times and stability conditions by introducing a known gust factor value at 15.3 meters and a computed constant into a simple power‐law expression.

Mean Horizontal Wind Speed and Direction Variability at Heights of 1.5 and 4.0 Meters above Ground Level at WSMR, New Mexico

“…Wind direction and speed difference variation in Figures 11 and 12 is quite similar to the variation as a function of lag time found by Armendariz and Lang [7], except that the differences in direction and speed are somewhat lteS. This is probably due to the smaller horizontal distance separation (75 meters) used here than the separation (275 meters) used by Armendariz and Lang [7].…”

“…This is probably due to the smaller horizontal distance separation (75 meters) used here than the separation (275 meters) used by Armendariz and Lang [7]. Therefore a negative value indicates a lapse condition and a positive value an inversion.…”

Helicopter Downwash Applied to Fog Clearing: A Status Summary

“…1969 -Following experiments using CH-47 and CH-54 helicopters Christensen [7] Table I has been extracted from the published form of a lesson plan prepared by ASL for the Army Aviation School [13]. This provides an overview of probabilities of success of the technique.…”

Effects of Vertical Wind on Tactical Rockets and Artillery Shells

“…The 300 meter displacement was derived from estimates of the vertical wind magnitude obtained at White Sands Missile Range, New Mexico [7]. This is significant since the one range probable error for 200 mils is 260 meters.…”