Simultaneous measurements of turbulent velocity and sediment motion under tidal bores

Khezri, Nazanin and Chanson, Hubert (2013). Simultaneous measurements of turbulent velocity and sediment motion under tidal bores. In: Wang Zhaoyin, Joseph Hun-wei Lee, Gao Jizhang and Cao Shuyou, Proceedings of the 35th IAHR World Congress. 35th IAHR World Congress, Chengdu, China, (1-10). 8-13 September, 2013.

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Name Description MIMEType Size Downloads
Author Khezri, Nazanin
Chanson, Hubert
Title of paper Simultaneous measurements of turbulent velocity and sediment motion under tidal bores
Conference name 35th IAHR World Congress
Conference location Chengdu, China
Conference dates 8-13 September, 2013
Proceedings title Proceedings of the 35th IAHR World Congress
Place of Publication Beijing, China
Publisher Tsinghua University Press
Publication Year 2013
Sub-type Fully published paper
ISBN 9787302335443
Editor Wang Zhaoyin
Joseph Hun-wei Lee
Gao Jizhang
Cao Shuyou
Start page 1
End page 10
Total pages 10
Collection year 2014
Language eng
Formatted Abstract/Summary
A tidal bore is a series of waves propagating upstream in a river mouth as the tide starts rising. The transient sediment motion beneath a breaking bore was investigated by measuring simultaneously the fluid and sediment motion in laboratory. Although there was no sediment transport observed during the initially steady flow, a transient sediment sheet flow motion was observed beneath the breaking bore. The sediment transport was initiated during the passage of the roller toe, when the discontinuity of the free-surface slope induced a large longitudinal pressure gradient force. The particles were subjected to large horizontal accelerations, with between 5 and 10% of all particles being subjected to maximum accelerations larger than 1 g. The particles were advected upstream with an average velocity close to the instantaneous fluid velocity. The present data provided some quantitative data in terms of various force terms acting on sediment particles beneath a tidal bore.
Keyword Tidal bores
Bed load
Transient sheet flow
Turbulence
Physical modelling
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Paper A10216.

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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Created: Mon, 09 Sep 2013, 08:48:24 EST by Hubert Chanson on behalf of School of Civil Engineering