Development of a Microburst Turbulence Model for the Joint Airport Weather Studies Wind Shear Data

摘要

A turbulence model is developed to supplement the microburst quasi-steady wind shear model established earlier from the JAWS Doppler radar sets. The wind shear model is, in effect, a quasi-steady, spatially varying wind field. The spatial scale of the wind variation is on the order of 500 to 750 ft. Airborne sensor response (i.e., angle of attack, stall warning, pitot tubes, etc.), structural dynamics, pilot workload, and other such factors, however, respond to much higher frequency wind effects. To account for these effects, a first cut turbulence model based on Doppler radar second moment data is presented. Superimposing the turbulent fluctuation from this turbulence model on the quasi-steady JAWS wind field is believed to provide a more realistic simulation of the microburst flow for aviation application.