TY - GEN
T1 - Sensitivity analysis of wake vortex parameters measured by doppler lidar
AU - Misaka, Takashi
AU - Obayashi, Shigeru
AU - Stephan, Anton
AU - Holzäpfel, Frank
AU - Gerz, Thomas
N1 - Publisher Copyright:
© 2015 AIAA American Institute of Aeronautics and Astronautics. All rights reserved.
PY - 2015
Y1 - 2015
N2 - In this study, the sensitivity analysis of wake vortex parameters measured by a Doppler lidar is conducted to assess the errors due to the measurement process. To reduce the uncertainty caused by the measurement process as possible, wake vortex parameters along with a surrounding wind field are estimated based on the four-dimensional variational (4D-Var) method assuming a velocity field obtained by the Rosenhead-Burnham-Hallock vortex model. With this approach, vortex parameters are obtained considering the factors such as insufficient resolution in the line-of-sight direction and vortex descent during a laser scan. It is confirmed from numerical experiments that the average circulation is significantly underestimated when it is derived from the lidar measurement, while vortex core radius becomes too large in the lidar measurement. On the other hand, vortex parameters estimated with the help of the 4D-Var method are improved by compensating the errors due to the measurement process.
AB - In this study, the sensitivity analysis of wake vortex parameters measured by a Doppler lidar is conducted to assess the errors due to the measurement process. To reduce the uncertainty caused by the measurement process as possible, wake vortex parameters along with a surrounding wind field are estimated based on the four-dimensional variational (4D-Var) method assuming a velocity field obtained by the Rosenhead-Burnham-Hallock vortex model. With this approach, vortex parameters are obtained considering the factors such as insufficient resolution in the line-of-sight direction and vortex descent during a laser scan. It is confirmed from numerical experiments that the average circulation is significantly underestimated when it is derived from the lidar measurement, while vortex core radius becomes too large in the lidar measurement. On the other hand, vortex parameters estimated with the help of the 4D-Var method are improved by compensating the errors due to the measurement process.
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U2 - 10.2514/6.2015-3023
DO - 10.2514/6.2015-3023
M3 - Conference contribution
AN - SCOPUS:85086949290
SN - 9781624103599
T3 - 7th AIAA Atmospheric and Space Environments Conference, 2015
BT - 7th AIAA Atmospheric and Space Environments Conference, 2015
PB - AIAA American Institute of Aeronautics and Astronautics
T2 - 7th AIAA Atmospheric and Space Environments Conference, 2015
Y2 - 22 June 2015 through 26 June 2015
ER -