Impact of stem size on turbulence and sediment resuspension under unidirectional flow
Name
2020WR028620.pdf
Description
Published version
Size
1.72 MB
Format
Adobe PDF
Checksum (MD5)
0c782b8210c1ec508b954ce199096fb1
Author(s)
Liu, Chao
Shan, Yuqi
Nepf, Heidi
Date Issued
March 2021
Journal
Water Resources Research
Publisher
American Geophysical Union (AGU)
Citation
Liu, C., Shan, Y., & Nepf, H. (2021). Impact of stem size on turbulence and sediment resuspension under unidirectional flow. Water Resources Research, 57, e2020WR028620.
Version
Final published version
Abstract
Laboratory experiments examined the impact of model vegetation on turbulence and resuspension. The turbulent kinetic energy increased with increasing velocity and increasing solid volume fraction, but did not depend on stem diameter. The vegetation-generated turbulence dominated the total turbulence inside canopies. For the same sediment size, the critical turbulent kinetic energy at which resuspension was initiated was the same for both vegetated and bare beds, which resulted in a critical velocity that decreased with increasing solid volume fraction. Both the critical turbulence and critical velocity for resuspension had no dependence on stem diameter. However, for denser canopies and/or a canopy of smaller stem size, a greater energy slope is required to initiate resuspension. This study provides a way to predict the onset of resuspension in regions with vegetation, an important threshold for sediment transport and landscape evolution.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2020WR028620
