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Effects of Added Vegetation on Sand Bar Stability and Stream Hydrodynamics

Author(s)
Rominger, Jeffrey Tsaros; Lightbody, Anne; Nepf, Heidi
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DownloadNepf-Effects of Added.pdf (1.016Mb)
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Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/
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Abstract
Vegetation was added to a fully developed sandy point bar in the meander of a constructed stream. Significant changes in the flow structure and bed topography were observed. As expected, the addition of vegetative resistance decreased the depth-averaged streamwise velocity over the bar and increased it in the open region. In addition, the secondary circulation increased in strength but became confined to the deepest section of the channel. Over the point bar, the secondary flow was entirely outward, i.e., toward the outer bank. The changes in flow led to changes in bar shape. Although the region of the bar closest to the inner bank accumulated sediment, erosion of the bar and the removal of plants by scouring were observed at the interface between the planted bar and the open channel.
Date issued
2010-02
URI
http://hdl.handle.net/1721.1/68006
Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Journal
Journal of Hydraulic Engineering
Publisher
American Society of Civil Engineers
Citation
Rominger, Jeffrey T., Anne F. Lightbody, and Heidi M. Nepf. “Effects of Added Vegetation on Sand Bar Stability and Stream Hydrodynamics.” Journal of Hydraulic Engineering 136.12 (2010): 994.
Version: Author's final manuscript
ISSN
0733-9429
1943-7900

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