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An experimental investigation of the channel adjustment process due to the passage of floods

Ershadi, C. and Valentine, Eric M. (2006). An experimental investigation of the channel adjustment process due to the passage of floods. In: Parker, Gary and García, Marcelo H. 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics (RCEM 2005), Urbana, Illinois, USA, 4-7 October 2005.

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Author Ershadi, C.
Valentine, Eric M.
Title An experimental investigation of the channel adjustment process due to the passage of floods
Conference Name 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics (RCEM 2005)
Conference Location Urbana, Illinois, USA
Conference Dates 4-7 October 2005
Conference Publication Title River, Coastal and Estuarine Morphodynamics: Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics (RCEM 2005)
Editor Parker, Gary
García, Marcelo H.
Place of Publication London
Publisher Taylor & Francis
Publication Year 2006
Volume Number 1
ISBN 978-0-415-39270-9   (check CDU catalogue open catalogue search in new window)
Start Page 295
End Page 300
Total Pages 6
Abstract A series of laboratory experiments have been carried out to investigate the channel forming process under unsteady flow conditions, when channel boundaries are allowed to develop freely. To simulate unsteady flows, a stepped triangular unit hydrograph was used. The peak flow rates were set such that the flood plains were not mobile. The base flow rates were also set such that the main channel dimensions were stable. The change in width of the main channel, the water surface elevation, and sediment transport rate, as channel adjustment criteria,were recorded during the experiment.The results showthat the width of the main channel and the channel side slope increased, and the depth decreased in response to the passage of the flood. The sediment concentration was usually larger on the rising than on the falling limb for the equivalent discharge. When channel conditions changed from bankfull to overbank, the sediment concentration decreased. A significant observation was that the stage was higher on the falling limb than on the rising limb for the equivalent discharge. As the discharge increased, two-dimensional dunes developed and during the recession they were suppressed or their migration ceased as sediment transport rates reduced. The results of this work may also improve our understanding of river channel response under flood flows.
Additional Notes Chapter 33
 
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Created: Fri, 29 Aug 2014, 18:35:05 CST by Anthony Hornby