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Atmospheric boundary layer structure at the head of a small Alpine tributary valley detected with uncrewed aerial systems (UAS)

Alexa, Almut (2023) Atmospheric boundary layer structure at the head of a small Alpine tributary valley detected with uncrewed aerial systems (UAS). Master's, University of Innsbruck.

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Official URL: https://ulb-dok.uibk.ac.at/urn/urn:nbn:at:at-ubi:1-142279

Abstract

Wind systems in the atmospheric boundary layer within valleys contribute to the transport and exchange of mass, energy, and momentum in mountainous areas. The research program "Multiscale transport and exchange processes in the atmosphere over mountains" (TEAMx) aims to investigate these processes on different scales through observations and numerical simulations in the TEAMx Observational Campaign(TOC) in 2024/2025. Measurements will be conducted at multiple sub-target areas across the Alps one of which being Nafingalm, a head of a tributary valley in Tyrol, Austria. In the framework of a pre¬ campaign in 2022(TEAMx-PC22), ground-based and airborne measurements were done at Nafingalm to explore the local mountain boundary layer and to test instrumentation for the TOC. Ground-based instruments were deployed between 15 June and 12 September 2022. Flights with a fleet of uncrewed aerial systems (UAS) were performed between 20 and 28 June 2022. The UAS measured temperature and humidity by an external sensor. Wind speed and direction were determined from the attitude data of the drones. Flight patterns performed were simultaneous point measurements, vertical and horizontal profiles, and combinations of these patterns. A case study was done on 23 June 2022 when most UAS flights were available, analyzing the atmospheric processes that occurred during different periods of the day. The UAS measurements complemented and extended the ground-based measurements, illustrating the occurrence of thermally-driven winds, foehn winds, and the formation of a stable boundary layer at the valley ground. Nafingalm proved to be a suitable location to observe local and mesoscale phenomena and their interaction. For the TOC, the UAS measurements should be complemented with remote sensing and further ground-based in-situ instrumentation in order to measure wind as well as temperature and humidity distribution along the valley axis and at heights up to crest level. A larger drone fleet would allow to sample areas on the scale of a cross-valley circulation. Doppler wind lidars could provide insight into along-valley and cross-valley winds at levels higher than the maximum UAS flight level. Ground-based instrumentation at the slopes could compensate for the inability of the lidar and UAS to measure in the range of a meter from the valley side wall.

Item URL in elib:https://elib.dlr.de/202730/
Document Type:Thesis (Master's)
Title:Atmospheric boundary layer structure at the head of a small Alpine tributary valley detected with uncrewed aerial systems (UAS)
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Alexa, AlmutUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:87
Status:Published
Keywords:UAS, valley head, atmospheric boundary layer, wind systems
Institution:University of Innsbruck
Department:Faculty of Geo- and Atmospheric Sciences
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Photovoltaics and Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Alexa, Almut
Deposited On:07 Feb 2024 14:06
Last Modified:07 Feb 2024 14:06

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