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You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic A: Advances in the Fundamentals of Water Science and Engineering : Investigation of horizontal coherent structures in shallow open-channel flows using quadrant analysi...
Investigation of horizontal coherent structures in shallow open-channel flows using quadrant analysis
Author : H. Ahmari and A.M. Ferreira da Silva
In this paper, a quadrant analysis is used to gain insight into the length-scale and life-cycle of the largest horizontal coherent structures (HCS’s) of an openchannel turbulent flow. The analysis rests on a series of velocity measurements of a uniform, turbulent and sub-critical flow, carried out in a 21m-long and 1m-wide laboratory channel. The conditions were such that the bed shear stress acting on the sand bed was substantially below the threshold for initiation of motion. The analysis supports earlier and independent findings by the writers indicating the presence in the flow of HCS’s having an average burst-length varying from four to seven times the flow width. It also indicates that the HCS’s originate at the banks, with the location of ejections and sweeps being anti-symmetrically arranged with regard to the channel centreline.
File Size : 364,867 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic A: Advances in the Fundamentals of Water Science and Engineering
Date Published : 09/08/2009
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