Wave‐Driven Sediment Resuspension Within a Model Eelgrass Meadow
Name
ZhangandNepf.2019.JGR.pdf
Description
Published version
Size
2.22 MB
Format
Adobe PDF
Checksum (MD5)
7a02befff34539139690b5c67fadb2bf
Author(s)
Zhang, Yinghao
Nepf, Heidi
Date Issued
March 2019
Journal
Journal of Geophysical Research: Earth Surface
Publisher
American Geophysical Union (AGU)
Citation
Zhang, Yinghao and Heidi Nepf, "Wave‐Driven Sediment Resuspension Within a Model Eelgrass Meadow." Journal of Geophysical Research: Earth Surface 124, 4 (April 2019): 1035-53 doi. 10.1029/2018JF004984 ©2019 Authors
Version
Final published version
Abstract
Wave velocity and suspended sediment concentration were measured over a sand bed with and without a model eelgrass meadow. The model meadow was geometrically and dynamically similar to the marine eelgrass Zostera marina. Meadows were constructed with three stem densities: 280, 600, and 820 stems/m2. Ripples formed within the meadow only when the spacing between stem rows was larger than the wave excursion. When ripples formed, the ripple geometry was the same as that observed for bare bed. When ripples were present, the near-bed turbulent kinetic energy (TKE) was dominated by the ripple-generated turbulence, and both the near-bed TKE and averaged suspended sediment concentration were similar across all meadow densities and bare bed at the same wave velocity. When ripples were absent, the near-bed TKE was dominated by the stem-generated turbulence, and the averaged suspended sediment concentration was reduced, compared to cases with ripples but at the same wave velocity. For conditions with and without a model meadow, the sediment diffusivity inferred from vertical profiles of suspended sediment concentration increased linearly with distance from the bed. ©2019. American Geophysical Union. All Rights Reserved.
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/10.1029/2018JF004984
