Austrian Academy of Sciences
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Verringerung des Temperatureinflusses bei der Überwachung von Brücken am Beispiel von Messdaten aus Luxemburg
No full textImmer mehr Betonbrücken weisen aufgrund von Korrosion und Ermüdung zunehmendSchäden auf. Neben der regelmäßigen normalen Sichtprüfung kann der Zustand der Brückeauch durch zusätzliche Tests mit wiederholter statischer Belastung und/oder dynamischenPrüfungen erfasst werden. Um eventuelle Schädigungen eines Bauwerks zu ermitteln und dieStandsicherheit überprüfen zu können, ist es wichtig, die Systemeigenschaften der Brücke im„gesunden“ Referenzzustand exakt zu kennen. Das Systemverhalten wird nicht nur durchSchäden beeinflusst, sondern auch durch Lagerbedingungen und Umwelteinflüsse, wie z. B.die Bauteiltemperatur. Der Einfluss der Temperatur kann sogar größere Änderungen derMessgrößen (Biegelinie oder modalen Parameter) hervorrufen als reale Schäden. Dahersollten Temperatureffekte vor jeder Zustandsanalyse kompensiert werden. Das Ziel dervorliegenden Arbeit ist es, den Einfluss der Lager und der Temperatur an einem realenBrückenträger darzustellen. Dazu wurden verschiedene statische und dynamische Tests imunbeschädigten Referenzzustand durchgeführt
Detection and analysis of landslide-induced river course changes and lake formation (RiCoLa) - Final Project Report
Get PDFLandslides are among the most serious threats to human lives and infrastructure in mountain ranges worldwide. Beyond the direct hazard through the moving mass, landslides can initiate natural hazard cascades by damming rivers and initiating catastrophic flash floods and debris flows. Through such long-range effects even unwitnessed landslides occurring in remote areas matter. Critically, insufficient information exists on landslide occurrence and recurrence intervals, and hence on the hazard potential of landslide hazard cascades, as well as possible prediction and prevention measures. This lack of information is mostly due to the remoteness of many mountain regions as well as the complex dynamics of natural hazard cascades even so the hazard posed by landslide dam failures is often orders of magnitudes greater than that of the initial landslide event. In the RiCoLa project, we developed, tested and applied remote sensing and process modeling approaches to detect existing and predict potential landslide dams and landslide-dammed lakes. The interdisciplinary RiCoLa project combined geomorphology, remote sensing, geoinformatics and hazard research in the frame of the Earth System Science Call of the Austrian Academy of Sciences (ÖAW) and facilitated the collaboration of researchers at the Department of Geography and Geology and the Interfaculty Department of Geoinformatics – Z_GIS at the University of Salzburg with colleagues from Taiwan and New Zealand. The central aim of the project was to detect landslide-induced river course changes and lake formation to analyze the role of predisposing (e.g., lithology), preparatory (e.g., climate) and triggering (e.g., earthquakes) factors in the formation of landslide-induced hazard cascades. For this, different tools for the detection and prediction of landslide dams and landslide-dammed lakes on satellite images and digital elevation models had to be developed, tested and applied to different mountain ranges worldwide
Sustainable human wellbeing: What can demography contribute?. Vienna Yearbook of Population Research|Vienna Yearbook of Population Research 2021|
No full textThis note considers the role that demography as a discipline can play in addressing some of the key questions in the context of human wellbeing and sustainable development. Starting with the wellbeing function of sustainability science that tries to explain an indicator of human wellbeing as being determined by a set of capitals and explanatory factors, it gives an example of how the constituents of such a wellbeing indicator can be combined based on a demographic approach. It also highlights how a broadened view of demographic methodology that goes beyond the conventional focus on age and sex alone can help to make demography more relevant for studying the key challenges of humanity
