Bedload transport within a patchy submerged canopy with different patch densities and spatial configuration
This study conducted laboratory experiments to investigate the bedload transport within a patchy submerged canopy across a range of patch area densities and spatial configurations. The patch area densities (ϕp), defined as the bed area fraction covered by patches, ranged from 0 to 0.56, while the sp...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2025-03-01
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| Series: | Frontiers in Marine Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2025.1531231/full |
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| Summary: | This study conducted laboratory experiments to investigate the bedload transport within a patchy submerged canopy across a range of patch area densities and spatial configurations. The patch area densities (ϕp), defined as the bed area fraction covered by patches, ranged from 0 to 0.56, while the spatial configurations varied from channel-spanning patches to laterally unconfined patches. At low area density (ϕp<0.3), as ϕp increased, more flow passed over the top of the canopy, decreasing the near-bed velocity. However, the formation of turbulent wakes around individual patches increased the near-bed turbulent kinetic energy (TKE). These opposing trends led to a mild decrease in the bedload transport rate with increasing ϕp. In contrast, at high area density (ϕp>0.3), both near-bed velocity and TKE decreased with increasing ϕp, resulting in a sharp decrease in bedload transport rate. Furthermore, at the same ϕp, channel-spanning patches were associated with lower bedload transport, compared to laterally unconfined patches. A predictive model for bedload transport rate that incorporated both near-bed mean velocity and TKE provided more accurate predictions than models based only on time-averaged velocity (bed stress) or TKE. |
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| ISSN: | 2296-7745 |