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Improved Integration of Ground-Based Low-Level Wind Shear Alert Systems Using a Grid-Based Approach

Show simple item record 2022-04-04T13:14:23Z 2022-04-04T13:14:23Z 2022-04-04
dc.title Improved Integration of Ground-Based Low-Level Wind Shear Alert Systems Using a Grid-Based Approach en
ethesis.faculty Matemaattis-luonnontieteellinen tiedekunta fi
ethesis.faculty Faculty of Science en
ethesis.faculty Matematisk-naturvetenskapliga fakulteten sv
ethesis.faculty.URI Helsingin yliopisto fi University of Helsinki en Helsingfors universitet sv
dct.creator Leino, Henrik
dct.issued 2022
dct.abstract Low-level wind shear is a significant aviation hazard. A sudden reduction in the headwind along an aircraft flight path can induce a loss of lift, from which an aircraft may not be able to recover when it is close to the ground. Airports therefore use low-level wind shear alert systems to monitor wind velocities within the airport terminal area and alert of any detected hazardous wind shear. There exist three ground-based sensor systems capable of independently observing low-level wind shear: a Doppler weather radar-based, a Doppler wind lidar-based, and an anemometer-based system. However, as no single sensor system is capable of all-weather wind shear observations, multiple alert systems are used simultaneously, and observations from each system are integrated to produce one set of integrated wind shear alerts. Algorithms for integrating Doppler weather radar and anemometer wind shear observations were originally developed in the early 1990s. However, the addition of the Doppler wind lidar-based alert system in more recent years warrants updates to the existing radar/anemometer integration algorithms. This thesis presents four different replacement candidates for the original radar/anemometer integration algorithms. A grid-based integration approach, where observations from different sensor systems are mapped onto a common grid and integrated, is found to best accommodate central integration considerations, and is recommended as the replacement to the original radar/anemometer algorithms in operational use. The grid-based approach is discussed in further detail, and a first possible implementation of the algorithm is presented. In addition, ways of validating the algorithm and adopting it for operational use are outlined. en
dct.subject wind shear
dct.subject aviation weather
dct.subject microburst
dct.subject Doppler weather radar
dct.subject Doppler wind lidar
dct.subject LLWAS
ethesis.isPublicationLicenseAccepted true
ethesis.language englanti fi
ethesis.language English en
ethesis.language engelska sv
ethesis.thesistype pro gradu -tutkielmat fi
ethesis.thesistype master's thesis en
ethesis.thesistype pro gradu-avhandlingar sv
dct.identifier.ethesis E-thesisID:448623ca-a1f3-4f9c-89da-5568137690f4
dct.identifier.urn URN:NBN:fi:hulib-202204041594
ethesis.facultystudyline Meteorologia fi
ethesis.facultystudyline Meteorology en
ethesis.facultystudyline Meteorologi sv
ethesis.mastersdegreeprogram Ilmakehätieteiden maisteriohjelma (Atmospheric Sciences) fi
ethesis.mastersdegreeprogram Master's Programme in Atmospheric Sciences en
ethesis.mastersdegreeprogram Magisterprogrammet i atmosfärsvetenskaper sv

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