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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Turbulent flow surface dynamics
Turbulent flow surface dynamics
Author : ANDY NICHOLS(1), SIMON TAIT(2) & KIRILL HOROSHENKOV(3)
ABSTRACT
The free-surface of shallow flows often appears random to the eye. This paper illustrates that the seemingly complex pattern can be decomposed into a number of fluctuating free-surface disturbances, overlapping and out of phase in both space and time. This new knowledge allows a deeper understanding of the nature of dynamic free-surface roughness patterns. This study considers several flow conditions established in a laboratory flume with a bed composed of uniform river gravel. Laser-induced-fluorescence is used to measure the free-surface dynamics in a vertical streamwise plane along the centerline of the flume. The free-surface fluctuations are examined over space and time, and are shown to influence the near-surface layer of the flow, highlighting a potential interdependence between the free-surface and the underlying flow.
File Size : 625,938 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 18/08/2015
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