NDLI: Evaluating the dimensionality and significance of “active periods” in turbulent environmental flows defined using Lipshitz/Hölder regularity

Content Provider	Springer Nature Link
Author	Keylock, Christopher J.
Copyright Year	2009
Abstract	Active periods within perturbed boundary-layer flows are considered in terms of the local roughness of measured velocity time series and defined in terms of Hölder/Lipshitz exponents. Such events are associated with the passage of energetic, coherent flow structures and are responsible for exerting high turbulent stresses because of the rapid changes in velocity that occur at such times. A method is proposed for assessing the effective dimensionality of such active periods, as well as their significance to the flow field, for a particular choice of flow metric. The method is applied to the turbulent flow through a confluence flow geometry, with velocity samples acquired close to the bed of the channel in a zone of complex mixing. The dimensionality of the active periods is consistent with the observed patterns of sediment entrainment from the bed, with the significance of the active periods decaying away from the erosional zone.
Starting Page	509
Ending Page	523
Page Count	15
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	9
Issue Number	5
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-03-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hölder/Lipschitz regularity Roughness exponents Intermittency Flow dimensionality River confluences Oceanography Meteorology/Climatology Hydrogeology Mechanics Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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