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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:17 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
On the SODAR remote sensing of wind shear over Otopeni airport
Authors:
Livius BUZDUGAN(1,2), Sabina STEFAN(1)
*
Affiliation:
1) University of Bucharest, Faculty of Physics, P.O.BOX: MG-11, Magurele, Bucharest, Romania
2)Romanian Air Traffic Services- ROMATSA, 10 Ion Ionescu De la Brad Str., Bucharest, Romania
E-mail
buzdugan.livius@gmail.com
Keywords:
AMDAR, AWOS, LLWS, METEK, SODAR, Wind shear
Abstract:
Low-level wind shear (LLWS), in the broadest sense, encompasses a family of air motions in the lower levels of the atmosphere, ranging from small-scale eddies and gustiness that may affect aircraft as turbulence, to the large-scale flow of one air mass layer past an adjacent layer. Included among the wide variety of phenomena that produce such air motions are thunderstorms, land/sea breezes, low-level jet streams, mountain waves and frontal systems. The significance of wind shear to aviation lies in its effect on aircraft performance and hence its adverse effects on flight safety. The aim of this work is to investigate vertical variations of wind speed, direction and their context, in some cases of LLWS at Otopeni airport (AIHCB). The study has been realized through the analysis of the 0-300 m layer wind profiles determined by a METEK PCS.2000-24 SODAR operated by ROMATSA. Surface wind data measured during July and November 2016 and runway configuration data were stored and retrieved using the software running on the Automatic Weather Observing System (AWOS) operated by ROMATSA at AIHCB. The SODAR reflectivity, signal to noise and wind profiles for the same period were retrieved using the METEK Graphics software.The results show important vertical variations of wind speed appearing in the SODAR wind profiles in all cases of non-convective LLWS reported by aircraft, with larger shear values inferred from the SODAR profiles than from the AMDAR reports and from nearby soundings. Also, significant differences in speed between AMDAR and SODAR wind were noticed at high wind speeds, associated with higher noise levels and turbulence.The effect of aircraft generated noise on the SODAR measurements appears significantly less important than that of other sources on the ground. Also, no significant seasonal variation of the signal to noise ratio could be inferred from the analysed data.
Acknowledgement:
The authors gratefully acknowledge ROMATSA for the provision of the data used in this scientific paper.
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