Turbulence Dictates Bedload Transport in Vegetated Channels Without Dependence on Stem Diameter and Arrangement
Name
10.1029-2021GL095316.pdf
Size
1.48 MB
Format
Adobe PDF
Checksum (MD5)
7a7a9f59bc8963b4dcebffc5f72669f8
Author(s)
Zhao, Tian
Nepf, Heidi M.
Date Issued
October 27, 2021
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
Zhao, T., & Nepf, H. M. (2021). Turbulence dictates bedload transport in vegetated channels without dependence on stem diameter and arrangement. Geophysical Research Letters, 48, e2021GL095316.
Version
Author's final manuscript
Abstract
Vegetation provides habitat and nature-based solutions to coastal flooding and erosion, drawing significant interest in its restoration, which requires an understanding of sediment transport and retention. Laboratory experiments examined the influence of stem diameter and arrangement on bedload sediment transport by considering arrays of different stem diameter and mixed diameters. Bedload transport rate was observed to depend on turbulent kinetic energy, with no dependence on stem diameter, which was shown to be consistent with the impulse model for sediment entrainment. Existing predictors of bedload transport for bare beds, based on bed shear stress, were recast in terms of turbulence. The new turbulence-based model predicted sediment transport measured in model canopies across a range of conditions drawn from several previous studies. A prediction of turbulence based on biomass and velocity was also described, providing an important step toward predicting turbulence and bedload transport in canopies of real vegetation morphology.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2021gl095316
