Suspended Sediment Concentration Profile in a Typha Latifolia Canopy
The transport of sediment in regions with vegetation plays an important role in aquatic ecosystems and landform evolution in river deltas. In this study, flow parameters and suspended sediment concentration (SSC) within an emergent canopy with real plant morphology (Typha latifolia) were measured in...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2022
|
| Online Access: | https://hdl.handle.net/1721.1/140402 |
| _version_ | 1811069698483159040 |
|---|---|
| author | Xu, Yuan Nepf, Heidi |
| author2 | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Civil and Environmental Engineering Xu, Yuan Nepf, Heidi |
| author_sort | Xu, Yuan |
| collection | MIT |
| description | The transport of sediment in regions with vegetation plays an important role in aquatic ecosystems and landform evolution in river deltas. In this study, flow parameters and suspended sediment concentration (SSC) within an emergent canopy with real plant morphology (Typha latifolia) were measured in a laboratory channel. T. latifolia is a common marsh species with multiple thin leaves emerging from a tight bundle (culm) at the bed. The observed equilibrium SSC profile differed significantly from a Rouse profile, the classic model for SSC over bare beds. The vertical distribution of SSC was nearly uniform in the culm region of the canopy, and decreased with height in the upper canopy region of distributed leaves. The profile of SSC reflected the vertically nonuniform turbulent diffusion, which arose from the plant morphology. A diffusivity model based on cylinder arrays was first validated with tracer data and then adapted to the T. latifolia morphology, providing a way to model turbulent diffusivity in marsh systems. The diffusivity model was successfully used within a random displacement model to predict the spatial evolution and equilibrium SSC profile within the T. latifolia canopy. |
| first_indexed | 2024-09-23T08:14:30Z |
| format | Article |
| id | mit-1721.1/140402 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:14:30Z |
| publishDate | 2022 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1404022024-06-06T20:07:57Z Suspended Sediment Concentration Profile in a Typha Latifolia Canopy Xu, Yuan Nepf, Heidi Massachusetts Institute of Technology. Department of Civil and Environmental Engineering The transport of sediment in regions with vegetation plays an important role in aquatic ecosystems and landform evolution in river deltas. In this study, flow parameters and suspended sediment concentration (SSC) within an emergent canopy with real plant morphology (Typha latifolia) were measured in a laboratory channel. T. latifolia is a common marsh species with multiple thin leaves emerging from a tight bundle (culm) at the bed. The observed equilibrium SSC profile differed significantly from a Rouse profile, the classic model for SSC over bare beds. The vertical distribution of SSC was nearly uniform in the culm region of the canopy, and decreased with height in the upper canopy region of distributed leaves. The profile of SSC reflected the vertically nonuniform turbulent diffusion, which arose from the plant morphology. A diffusivity model based on cylinder arrays was first validated with tracer data and then adapted to the T. latifolia morphology, providing a way to model turbulent diffusivity in marsh systems. The diffusivity model was successfully used within a random displacement model to predict the spatial evolution and equilibrium SSC profile within the T. latifolia canopy. 2022-02-16T15:21:39Z 2022-02-16T15:21:39Z 2021-09-01 Article http://purl.org/eprint/type/JournalArticle 0043-1397 1944-7973 https://hdl.handle.net/1721.1/140402 Xu, Y., & Nepf, H. (2021). Suspended sediment concentration profile in a Typha Latifolia Canopy. Water Resources Research, 57, e2021WR029902. en http://dx.doi.org/10.1029/2021wr029902 Water Resources Research Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Geophysical Union (AGU) Wiley |
| spellingShingle | Xu, Yuan Nepf, Heidi Suspended Sediment Concentration Profile in a Typha Latifolia Canopy |
| title | Suspended Sediment Concentration Profile in a Typha Latifolia Canopy |
| title_full | Suspended Sediment Concentration Profile in a Typha Latifolia Canopy |
| title_fullStr | Suspended Sediment Concentration Profile in a Typha Latifolia Canopy |
| title_full_unstemmed | Suspended Sediment Concentration Profile in a Typha Latifolia Canopy |
| title_short | Suspended Sediment Concentration Profile in a Typha Latifolia Canopy |
| title_sort | suspended sediment concentration profile in a typha latifolia canopy |
| url | https://hdl.handle.net/1721.1/140402 |
| work_keys_str_mv | AT xuyuan suspendedsedimentconcentrationprofileinatyphalatifoliacanopy AT nepfheidi suspendedsedimentconcentrationprofileinatyphalatifoliacanopy |