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iDEA: DREXEL LIBRARIES E-REPOSITORY AND ARCHIVES

iDEA: DREXEL LIBRARIES E-REPOSITORY AND ARCHIVES

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On the initiation of meandering and the subsequent plan-development of meander loops

Details
Title
On the initiation of meandering and the subsequent plan-development of meander loops
Author(s)
Ferreira da Silva, Ana Maria
Keywords
River morphodynamics; Fluvial hydraulics
Date
2006-09-12
Abstract
The formation and the different plan arrangements of large-scale horizontal coherent structures in river flows are discussed on the basis of recent turbulence studies and all available morphological data. It is shown that the wavelength of a meandering flow coincides with the length of the (basic) one-row configuration of turbulence coherent structures at the beginning of “experiment” (at time , when the channel is still straight). The initiation of meandering is attributed to the action on the movable banks of the sequence of these structures, either by their direct impact on the banks or by the convective action of the internal meandering they generate. The subsequent time-development of the so-initiated meandering and the eventual fate of a meandering stream are explained by invoking the regime-trend. The considerations in this paper are used to derive the prediction criteria for the meandering of initially straight and wide streams in cohesionless alluvium. The paper concludes with the introduction of a method for the determination of the stable plan shape of a meandering course.
Citation
Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
URI
http://hdl.handle.net/1860/1496
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Drexel Research

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