Abstract
This article describes a simple empirical model for the transport and decay of aircraft trailing wake vortices between parallel runways in a turbulent atmosphere. It is suitable for applications to both single and closely spaced parallel runways. The model includes the influence of ambient turbulence on the decay rate of the wake vortices as well as the effect of cross wind shear. Well-known Monin-Obukh off similarity laws in the lower atmospheric boundary layer are used to compute the ambient shear and turbulence. Vortex bounce that occurs near the ground is also parameterized in the model. The results show that ambient shear plays an important role in vortex decay and transport. Atmospheric stability also affects the fate of these vortices, but with stable stratification having a much larger effect than convective heating of the atmospheric boundary layer. These results may prove useful for a better understanding of the factors that affect the transport and decay of aircraft wake vortices near the ground in the presence of crosswinds in a turbulent atmosphere.
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