Uncertainly quantification of lidar-derived wake vortex parameters with/without data assimilation

Takashi Misaka, Shigeru Obayashi, Shinkyu Jeong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the uncertainty quantification of wake vortex parameters measured by a Doppler lidar is conducted to assess the errors of the lidar-derived parameters due to the measurement process. We employ three methods to estimate vortex parameters from lidar measurements: a simple method to detect velocity peaks on the measurement plane, and a least-square fitting of a vortex model to lidar velocity. In addition, 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 the last approach, vortex parameters are obtained considering the factors such as insufficient resolution in the line-of-sight direction and vortex movement during a laser scan. It is confirmed from numerical experiments that the average circulation is significantly underestimated and core radius becomes too large with the simple method. The least-square fitting reduces the deviation of output/input parameter ratios. On the other hand, vortex parameters estimated with the help of the 4D-Var method are further improved by compensating the errors due to the measurement process.

Original languageEnglish
Title of host publication8th AIAA Atmospheric and Space Environments Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104336
Publication statusPublished - 2016 Jan 1
Event8th AIAA Atmospheric and Space Environments Conference, 2016 - Washington, United States
Duration: 2016 Jun 132016 Jun 17

Publication series

Name8th AIAA Atmospheric and Space Environments Conference

Other

Other8th AIAA Atmospheric and Space Environments Conference, 2016
CountryUnited States
CityWashington
Period16/6/1316/6/17

ASJC Scopus subject areas

  • Space and Planetary Science
  • Atmospheric Science

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