Flow Characteristics over a Gravel Bedform: Kaj River Case Study

The present study deals with the turbulence structure in order to better understand the interaction of bedform and flow characteristics in a gravel-bed river. Data measured above a bedform is used to analyze the importance of coherent structures in turbulent transfer. The Reynolds stress and turbule...

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Bibliographic Details
Published in:Acta geophysica 2016-10, Vol.64 (5), p.1779-1796
Main Authors: Maddahi, Mohammad Reza, Afzalimehr, Hossein, Rowinski, Paweł M.
Format: Article
Language:English
Subjects:
bedform
Boundary layer
Case studies
Earth and Environmental Science
Earth Sciences
Flow characteristics
Flow control
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Gravel
gravel-bed river
quadrant analysis
Reynolds stress
River beds
Rivers
Sedimentary structures
Structural Geology
turbulence
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Summary:The present study deals with the turbulence structure in order to better understand the interaction of bedform and flow characteristics in a gravel-bed river. Data measured above a bedform is used to analyze the importance of coherent structures in turbulent transfer. The Reynolds stress and turbulence intensity in stream-wise direction illustrate significant difference along the bedform, showing a three-layer distribution at the crest and a convex one at the downstream of bedform. Quadrant analysis technique is used to picture momentum exchange above the considered bedform and to find the dominant event in bursting process of the gravel bedform. Quadrant analysis demonstrates that the mechanisms of bedforms generation in sand and gravel-bed rivers are similar and sweep is the dominant event in both rivers.
ISSN:1895-6572
1895-7455
DOI:10.1515/acgeo-2016-0079