Flow and Turbulence Due To Wood Contribute to Declogging of Gravel Bed
Name
Geophysical Research Letters - 2024 - Schalko - Flow and Turbulence Due To Wood Contribute to Declogging of Gravel Bed.pdf
Description
Published version
Size
4.37 MB
Format
Adobe PDF
Checksum (MD5)
aa2b7c40a724b1d143f9ac5f2c92ddd1
Author(s)
Schalko, I
Ponce, M
Lassar, S
Schwindt, S
Haun, S
Nepf, H
Date Issued
January 21, 2024
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Schalko, I., Ponce, M., Lassar, S., Schwindt, S., Haun, S., & Nepf, H. (2024). Flow and turbulence due to wood contribute to declogging of gravel bed. Geophysical Research Letters, 51, e2023GL107507.
Version
Final published version
Abstract
The placement of wood in rivers is a common restoration method used to locally affect hydraulic and morphologic conditions to create habitat. Laboratory experiments demonstrated that wood placements can also promote surface declogging, that is, removal of fine sediment from a gravel bed, thereby restoring spawning grounds for fish. Logs of different size and submergence level were placed on a gravel bed clogged with fines. Surface declogging was observed in regions of elevated turbulence in the log wake and elevated velocity adjacent to the log. A criteria for declogging was identified based on a modified non‐dimensional Shields parameter combining mean and turbulent velocity at the bed. The footprint of declogged bed scaled with log dimensions. Emergent logs produced a larger declogging footprint compared to submerged logs of the same length, due to their stronger influence on the flow field. Logs were also shown to prevent clogging over similar areas.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivatives
Persistent DSpace Link
DOI of Published Version
10.1029/2023gl107507
