NDLI: Dynamics of Turbulence in Low-Speed Oscillating Bottom-Boundary Layers of Stratified Basins

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An Approach for the Aggregation of Aerodynamic Surface Parameters in Calculating the Turbulent Fluxes over Heterogeneous Surfaces in Atmospheric Models

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Environmental Fluid Mechanics : Volume 2, Issue 3, September 2002

Environmental Fluid Mechanics : Volume 2, Issue 1-2, June 2002

Environmental Fluid Mechanics : Volume 1

Dynamics of Turbulence in Low-Speed Oscillating Bottom-Boundary Layers of Stratified Basins

Content Provider	Springer Nature Link
Author	Lorke, Andreas Umlauf, Lars Jonas, Tobias Wüest, Alfred
Copyright Year	2002
Abstract	This paper focuses on the impact of an oscillating low-speed current on the structure and dynamics of the bottom-boundary layer (BBL) in a small stratified basin. A set of high-resolution current profile measurements in combination with temperature-microstructure measurements were collected during a complete cycle of the internal oscillation (`seiching') in the BBL of Lake Alpnach, Switzerland. It was found that even a relatively long seiching period of 24 hours significantly changed the form of the near-bottom current profiles as well as the dynamics of the turbulent dissipation rate compared to the steady-state law-of-the-wall. A logarithmic fit to the measured current profiles starting at a distance of 0.5 m above the sediment led to inconsistent estimates of both friction velocity and roughness length. Moreover, a phase lag between the current and the turbulent dissipation of 1.5 hours and a persistent maximum in the current profile at a height of 2.5 to 3 m above the sediment were observed. The experimental findings were compared to the results of a k-ε turbulence model and showed good agreement in general. Specifically, the inconsistent logarithmic fitting results and the observed phase lag were reproduced well by the model.
Starting Page	291
Ending Page	313
Page Count	23
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	2
Issue Number	4
e-ISSN	15731510
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Meteorology/Climatology Oceanography Mechanics Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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