Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment
Abstract Previous studies have demonstrated that vegetation‐generated turbulence can enhance erosion rate and reduce the velocity threshold for erosion of non‐cohesive sediment. This study considered whether vegetation‐generated turbulence had a similar influence on natural cohesive sediment. Cores...
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| Format: | Article |
| Language: | English |
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Wiley
2024-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL109730 |
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| author | Autumn R. Deitrick David K. Ralston Christopher R. Esposito Melissa M. Baustian Maricel Beltrán Burgos Andrew J. Courtois Heidi Nepf |
| author_facet | Autumn R. Deitrick David K. Ralston Christopher R. Esposito Melissa M. Baustian Maricel Beltrán Burgos Andrew J. Courtois Heidi Nepf |
| author_sort | Autumn R. Deitrick |
| collection | DOAJ |
| description | Abstract Previous studies have demonstrated that vegetation‐generated turbulence can enhance erosion rate and reduce the velocity threshold for erosion of non‐cohesive sediment. This study considered whether vegetation‐generated turbulence had a similar influence on natural cohesive sediment. Cores were collected from a black mangrove forest with aboveground biomass and exposed to stepwise increases in velocity. Erosion was recorded through suspended sediment concentration. For the same velocity, cores with pneumatophores had elevated turbulent kinetic energy compared to bare cores without pneumatophores. However, the vegetation‐generated turbulence did not increase bed stress or the rate of resuspension, relative to bare cores. It was hypothesized that the short time‐scale fluctuations associated with vegetation‐generated turbulence were not of sufficient duration to break cohesion between grains, explaining why elevated levels of turbulence associated with the pneumatophores had no impact on the erosion threshold or rate. |
| format | Article |
| id | doaj-art-bac236b65efb42a286256ea2ea68e445 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-bac236b65efb42a286256ea2ea68e4452025-08-20T01:51:55ZengWileyGeophysical Research Letters0094-82761944-80072024-07-015114n/an/a10.1029/2024GL109730Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive SedimentAutumn R. Deitrick0David K. Ralston1Christopher R. Esposito2Melissa M. Baustian3Maricel Beltrán Burgos4Andrew J. Courtois5Heidi Nepf6Civil and Environmental Engineering M.I.T Cambridge MA USADepartment of Applied Ocean Physics and Engineering Woods Hole Oceanographic Institution Woods Hole MA USAThe Water Institute Baton Rouge LA USAU.S. Geological Survey Wetland and Aquatic Research Center, Baton Rouge LA United States Previously at the Water Institute Baton Rouge LA USAThe Water Institute Baton Rouge LA USAThe Water Institute Baton Rouge LA USACivil and Environmental Engineering M.I.T Cambridge MA USAAbstract Previous studies have demonstrated that vegetation‐generated turbulence can enhance erosion rate and reduce the velocity threshold for erosion of non‐cohesive sediment. This study considered whether vegetation‐generated turbulence had a similar influence on natural cohesive sediment. Cores were collected from a black mangrove forest with aboveground biomass and exposed to stepwise increases in velocity. Erosion was recorded through suspended sediment concentration. For the same velocity, cores with pneumatophores had elevated turbulent kinetic energy compared to bare cores without pneumatophores. However, the vegetation‐generated turbulence did not increase bed stress or the rate of resuspension, relative to bare cores. It was hypothesized that the short time‐scale fluctuations associated with vegetation‐generated turbulence were not of sufficient duration to break cohesion between grains, explaining why elevated levels of turbulence associated with the pneumatophores had no impact on the erosion threshold or rate.https://doi.org/10.1029/2024GL109730pneumatophoresturbulenceerosioncohesive sediment |
| spellingShingle | Autumn R. Deitrick David K. Ralston Christopher R. Esposito Melissa M. Baustian Maricel Beltrán Burgos Andrew J. Courtois Heidi Nepf Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment Geophysical Research Letters pneumatophores turbulence erosion cohesive sediment |
| title | Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment |
| title_full | Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment |
| title_fullStr | Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment |
| title_full_unstemmed | Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment |
| title_short | Vegetation‐Generated Turbulence Does Not Impact the Erosion of Natural Cohesive Sediment |
| title_sort | vegetation generated turbulence does not impact the erosion of natural cohesive sediment |
| topic | pneumatophores turbulence erosion cohesive sediment |
| url | https://doi.org/10.1029/2024GL109730 |
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