Doppler lidar investigation of wake vortex transport between closely spaced parallel runways

The paper demonstrates the potential of the Doppler lidar technique for the investigation of aircraft wake vortices. During several extended field experiments at the Frankfurt/Main Airport, the DLR laser Doppler anemometer has measured the vortex properties of a large variety of landing aircraft. These data are used to increase the understanding of the behavior of wake vortices with special emphasis on the horizontal vortex transport in ground effect. In particular, the results of the vortex transport considerations are the basis for air traffic control to enhance the efficiency of closely spaced parallel runway systems with respect to wake vortices.