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Detecting flow events in turbulent flow of vertical-slot fish passes

Sokoray-Varga, Béla

Abstract (englisch):

According to earlier research, one key features determining the influence of turbulence on fish swimming behavior is the short-term predictability of turbulence that, in this study, is interpreted as the existence of turbulent flow events in the flow field whose occurrences are predictable. Here, the fundamental assumption is that repeating sequences of flow events are the basis for predictability, because repetition facilitates their recognition by experience on the fish’ part and, therefore, flow events occurring later in time within the repeating sequences are considered predictable.
This thesis presents a flow-analysis methodology for detecting repeating sequences of large-scale turbulent flow events and their occurrences in the flow. Here, the term flow event refers to changes in the flow field associated with the appearance of turbulent flow structures or with their change of position, while the term occurrence denotes instances of times at which the particular flow event happens.
The presented methodology is applied in this work to a Particle Image Velocimetry measurement performed in the scale model of a vertical-slot fish pass and uses Proper Orthogonal Decomposition (POD) in a novel way. ... mehr

Volltext §
DOI: 10.5445/IR/1000072000
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Hochschulschrift
Publikationsjahr 2016
Sprache Englisch
Identifikator urn:nbn:de:swb:90-720003
KITopen-ID: 1000072000
Verlag Karlsruher Institut für Technologie (KIT)
Art der Arbeit Dissertation
Fakultät Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften (BGU)
Institut Institut für Wasser und Gewässerentwicklung (IWG)
Prüfungsdatum 26.10.2016
Schlagwörter turbulence measurement, vertical-slot fish pass, PIV, POD, fish swimming performance, IPOS framework, predictability
Referent/Betreuer Nestmann, F.
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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