The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel
This study experimentally investigated the effect of boulder spacing and boulder submergence ratio on the near-bed shear stress in a single array of boulders in a gravel bed open channel flume. An acoustic Doppler velocimeter (ADV) was used to measure the instantaneous three-dimensional velocity com...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/5/1423 |
| _version_ | 1797567816955592704 |
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| author | Amir Golpira Fengbin Huang Abul B.M. Baki |
| author_facet | Amir Golpira Fengbin Huang Abul B.M. Baki |
| author_sort | Amir Golpira |
| collection | DOAJ |
| description | This study experimentally investigated the effect of boulder spacing and boulder submergence ratio on the near-bed shear stress in a single array of boulders in a gravel bed open channel flume. An acoustic Doppler velocimeter (ADV) was used to measure the instantaneous three-dimensional velocity components. Four methods of estimating near-bed shear stress were compared. The results suggested a significant effect of boulder spacing and boulder submergence ratio on the near-bed shear stress estimations and their spatial distributions. It was found that at unsubmerged condition, the turbulent kinetic energy (TKE) and modified TKE methods can be used interchangeably to estimate the near-bed shear stress. At both submerged and unsubmerged conditions, the Reynolds method performed differently from the other point-methods. Moreover, a quadrant analysis was performed to examine the turbulent events and their contribution to the near-bed Reynolds shear stress with the effect of boulder spacing. Generally, the burst events (ejections and sweeps) were reduced in the presence of boulders. This study may improve the understanding of the effect of the boulder spacing and boulder submergence ratio on the near-bed shear stress estimations of stream restoration practices. |
| first_indexed | 2024-03-10T19:46:58Z |
| format | Article |
| id | doaj.art-ab3fcfe5407143e581dd48b61fee5add |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T19:46:58Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-ab3fcfe5407143e581dd48b61fee5add2023-11-20T00:43:16ZengMDPI AGWater2073-44412020-05-01125142310.3390/w12051423The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed ChannelAmir Golpira0Fengbin Huang1Abul B.M. Baki2Civil and Environmental Engineering Department, Clarkson University, Potsdam, NY 13699, USACivil and Environmental Engineering Department, Clarkson University, Potsdam, NY 13699, USACivil and Environmental Engineering Department, Clarkson University, Potsdam, NY 13699, USAThis study experimentally investigated the effect of boulder spacing and boulder submergence ratio on the near-bed shear stress in a single array of boulders in a gravel bed open channel flume. An acoustic Doppler velocimeter (ADV) was used to measure the instantaneous three-dimensional velocity components. Four methods of estimating near-bed shear stress were compared. The results suggested a significant effect of boulder spacing and boulder submergence ratio on the near-bed shear stress estimations and their spatial distributions. It was found that at unsubmerged condition, the turbulent kinetic energy (TKE) and modified TKE methods can be used interchangeably to estimate the near-bed shear stress. At both submerged and unsubmerged conditions, the Reynolds method performed differently from the other point-methods. Moreover, a quadrant analysis was performed to examine the turbulent events and their contribution to the near-bed Reynolds shear stress with the effect of boulder spacing. Generally, the burst events (ejections and sweeps) were reduced in the presence of boulders. This study may improve the understanding of the effect of the boulder spacing and boulder submergence ratio on the near-bed shear stress estimations of stream restoration practices.https://www.mdpi.com/2073-4441/12/5/1423boulder spacingsubmergence rationear-bed shear stressReynolds shear stressturbulent eventsstream restoration |
| spellingShingle | Amir Golpira Fengbin Huang Abul B.M. Baki The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel Water boulder spacing submergence ratio near-bed shear stress Reynolds shear stress turbulent events stream restoration |
| title | The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel |
| title_full | The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel |
| title_fullStr | The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel |
| title_full_unstemmed | The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel |
| title_short | The Effect of Habitat Structure Boulder Spacing on Near-Bed Shear Stress and Turbulent Events in a Gravel Bed Channel |
| title_sort | effect of habitat structure boulder spacing on near bed shear stress and turbulent events in a gravel bed channel |
| topic | boulder spacing submergence ratio near-bed shear stress Reynolds shear stress turbulent events stream restoration |
| url | https://www.mdpi.com/2073-4441/12/5/1423 |
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