Characteristics of Monami Wave in Submerged Vegetated Flow
Publication: Journal of Hydrologic Engineering
Volume 15, Issue 3
Abstract
Flow through submerged vegetation with inflection in the vertical profile of flow velocity exhibits instability at the interface of vegetation and overflow and causes generation of Kelvin-Helmholtz vortices. In case of flexible vegetation, the vortices cause periodic movement of stems called a monami wave. In this paper, the geometry of a bending stem is derived and the amplitude of the monami wave is calculated as a function of the bending angle. Using continuity and momentum equations, the stem geometry, combined with the temporal density stratification due to the periodic motion of stems, is analyzed to determine the frequency of the monami wave. The wave period, combined with the amplitude, explains the interfacial monami wave. The amplitude and period are derived in terms of easily measurable flow and vegetation parameters.
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Information
Published In
Journal of Hydrologic Engineering
Volume 15 • Issue 3 • March 2010
Pages: 171 - 181
Copyright
© 2010 ASCE.
History
Received: Apr 9, 2008
Accepted: Aug 18, 2009
Published online: Feb 12, 2010
Published in print: Mar 2010
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